[{"publist_id":"3530","intvolume":"         7","article_number":"e36715","status":"public","date_created":"2018-12-11T12:01:44Z","month":"06","volume":7,"issue":"6","pubrep_id":"385","publisher":"Public Library of Science","file_date_updated":"2020-07-14T12:46:01Z","oa":1,"ddc":["510"],"_id":"3159","title":"Hierarchical ordering of reticular networks","publication":"PLoS One","publication_status":"published","abstract":[{"text":"The structure of hierarchical networks in biological and physical systems has long been characterized using the Horton-Strahler ordering scheme. The scheme assigns an integer order to each edge in the network based on the topology of branching such that the order increases from distal parts of the network (e.g., mountain streams or capillaries) to the &quot;root&quot; of the network (e.g., the river outlet or the aorta). However, Horton-Strahler ordering cannot be applied to networks with loops because they they create a contradiction in the edge ordering in terms of which edge precedes another in the hierarchy. Here, we present a generalization of the Horton-Strahler order to weighted planar reticular networks, where weights are assumed to correlate with the importance of network edges, e.g., weights estimated from edge widths may correlate to flow capacity. Our method assigns hierarchical levels not only to edges of the network, but also to its loops, and classifies the edges into reticular edges, which are responsible for loop formation, and tree edges. In addition, we perform a detailed and rigorous theoretical analysis of the sensitivity of the hierarchical levels to weight perturbations. In doing so, we show that the ordering of the reticular edges is more robust to noise in weight estimation than is the ordering of the tree edges. We discuss applications of this generalized Horton-Strahler ordering to the study of leaf venation and other biological networks.","lang":"eng"}],"quality_controlled":"1","author":[{"full_name":"Mileyko, Yuriy","first_name":"Yuriy","last_name":"Mileyko"},{"first_name":"Herbert","last_name":"Edelsbrunner","id":"3FB178DA-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-9823-6833","full_name":"Edelsbrunner, Herbert"},{"full_name":"Price, Charles","last_name":"Price","first_name":"Charles"},{"full_name":"Weitz, Joshua","last_name":"Weitz","first_name":"Joshua"}],"citation":{"apa":"Mileyko, Y., Edelsbrunner, H., Price, C., &#38; Weitz, J. (2012). Hierarchical ordering of reticular networks. <i>PLoS One</i>. Public Library of Science. <a href=\"https://doi.org/10.1371/journal.pone.0036715\">https://doi.org/10.1371/journal.pone.0036715</a>","mla":"Mileyko, Yuriy, et al. “Hierarchical Ordering of Reticular Networks.” <i>PLoS One</i>, vol. 7, no. 6, e36715, Public Library of Science, 2012, doi:<a href=\"https://doi.org/10.1371/journal.pone.0036715\">10.1371/journal.pone.0036715</a>.","ista":"Mileyko Y, Edelsbrunner H, Price C, Weitz J. 2012. Hierarchical ordering of reticular networks. PLoS One. 7(6), e36715.","chicago":"Mileyko, Yuriy, Herbert Edelsbrunner, Charles Price, and Joshua Weitz. “Hierarchical Ordering of Reticular Networks.” <i>PLoS One</i>. Public Library of Science, 2012. <a href=\"https://doi.org/10.1371/journal.pone.0036715\">https://doi.org/10.1371/journal.pone.0036715</a>.","short":"Y. Mileyko, H. Edelsbrunner, C. Price, J. Weitz, PLoS One 7 (2012).","ama":"Mileyko Y, Edelsbrunner H, Price C, Weitz J. Hierarchical ordering of reticular networks. <i>PLoS One</i>. 2012;7(6). doi:<a href=\"https://doi.org/10.1371/journal.pone.0036715\">10.1371/journal.pone.0036715</a>","ieee":"Y. Mileyko, H. Edelsbrunner, C. Price, and J. Weitz, “Hierarchical ordering of reticular networks,” <i>PLoS One</i>, vol. 7, no. 6. Public Library of Science, 2012."},"year":"2012","tmp":{"image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"scopus_import":1,"date_published":"2012-06-06T00:00:00Z","file":[{"file_id":"5922","date_updated":"2020-07-14T12:46:01Z","checksum":"515a98ad72e470752f03f13663dcaff8","file_name":"2012_PLoS_Mileyko.PDF","access_level":"open_access","relation":"main_file","date_created":"2019-02-05T12:38:43Z","file_size":541583,"creator":"kschuh","content_type":"application/pdf"}],"license":"https://creativecommons.org/licenses/by/4.0/","doi":"10.1371/journal.pone.0036715","language":[{"iso":"eng"}],"department":[{"_id":"HeEd"}],"has_accepted_license":"1","acknowledgement":"his work was supported by the National Science Foundation Plant Genome Research Program (grant 0820624 to H.E. and J.S.W.), the Defense Advanced Projects Research Agency (grant HR0011-09-1-0055 to H.E. and J.S.W.), and the European Science Foundation (under the Research Networking Programme on “Applied and Computational Algebraic Topology” run by H.E.). Joshua S. Weitz, Ph.D., holds a Career Award at the Scientific Interface from the Burroughs Wellcome Fund.\r\n\r\n\r\n\r\nDuring preparation of this manuscript the authors became aware of a related work by Katifori and Magnasco (arXiv:1110.1412v1), concurrently submitted and accepted for publication in PLoS ONE.","user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","day":"06","type":"journal_article","date_updated":"2021-01-12T07:41:28Z","oa_version":"Published Version"},{"author":[{"id":"3FB178DA-F248-11E8-B48F-1D18A9856A87","full_name":"Edelsbrunner, Herbert","orcid":"0000-0002-9823-6833","last_name":"Edelsbrunner","first_name":"Herbert"},{"last_name":"Kerber","first_name":"Michael","orcid":"0000-0002-8030-9299","full_name":"Kerber, Michael","id":"36E4574A-F248-11E8-B48F-1D18A9856A87"}],"quality_controlled":"1","citation":{"mla":"Edelsbrunner, Herbert, and Michael Kerber. “Dual Complexes of Cubical Subdivisions of ℝn.” <i>Discrete &#38; Computational Geometry</i>, vol. 47, no. 2, Springer, 2012, pp. 393–414, doi:<a href=\"https://doi.org/10.1007/s00454-011-9382-4\">10.1007/s00454-011-9382-4</a>.","apa":"Edelsbrunner, H., &#38; Kerber, M. (2012). Dual complexes of cubical subdivisions of ℝn. <i>Discrete &#38; Computational Geometry</i>. Springer. <a href=\"https://doi.org/10.1007/s00454-011-9382-4\">https://doi.org/10.1007/s00454-011-9382-4</a>","ama":"Edelsbrunner H, Kerber M. Dual complexes of cubical subdivisions of ℝn. <i>Discrete &#38; Computational Geometry</i>. 2012;47(2):393-414. doi:<a href=\"https://doi.org/10.1007/s00454-011-9382-4\">10.1007/s00454-011-9382-4</a>","ieee":"H. Edelsbrunner and M. Kerber, “Dual complexes of cubical subdivisions of ℝn,” <i>Discrete &#38; Computational Geometry</i>, vol. 47, no. 2. Springer, pp. 393–414, 2012.","ista":"Edelsbrunner H, Kerber M. 2012. Dual complexes of cubical subdivisions of ℝn. Discrete &#38; Computational Geometry. 47(2), 393–414.","short":"H. Edelsbrunner, M. Kerber, Discrete &#38; Computational Geometry 47 (2012) 393–414.","chicago":"Edelsbrunner, Herbert, and Michael Kerber. “Dual Complexes of Cubical Subdivisions of ℝn.” <i>Discrete &#38; Computational Geometry</i>. Springer, 2012. <a href=\"https://doi.org/10.1007/s00454-011-9382-4\">https://doi.org/10.1007/s00454-011-9382-4</a>."},"year":"2012","oa":1,"ddc":["000"],"_id":"3256","publication":"Discrete & Computational Geometry","title":"Dual complexes of cubical subdivisions of ℝn","publication_status":"published","abstract":[{"text":"We use a distortion to define the dual complex of a cubical subdivision of ℝ n as an n-dimensional subcomplex of the nerve of the set of n-cubes. Motivated by the topological analysis of high-dimensional digital image data, we consider such subdivisions defined by generalizations of quad- and oct-trees to n dimensions. Assuming the subdivision is balanced, we show that mapping each vertex to the center of the corresponding n-cube gives a geometric realization of the dual complex in ℝ n.","lang":"eng"}],"issue":"2","volume":47,"pubrep_id":"543","publisher":"Springer","file_date_updated":"2020-07-14T12:46:05Z","publist_id":"3398","intvolume":"        47","status":"public","date_created":"2018-12-11T12:02:17Z","month":"03","user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","day":"01","date_updated":"2021-01-12T07:42:10Z","type":"journal_article","oa_version":"Submitted Version","doi":"10.1007/s00454-011-9382-4","language":[{"iso":"eng"}],"department":[{"_id":"HeEd"}],"has_accepted_license":"1","acknowledgement":"This research is partially supported by the Defense Advanced Research Projects Agency (DARPA) under grants HR0011-05-1-0057 and HR0011-09-0065 as well as the National Science Foundation (NSF) under grant DBI-0820624.","page":"393 - 414","date_published":"2012-03-01T00:00:00Z","file":[{"checksum":"76486f3b2c9e7fd81342f3832ca387e7","file_name":"IST-2016-543-v1+1_2012-J-08-HierarchyCubeComplex.pdf","access_level":"open_access","file_id":"4675","date_updated":"2020-07-14T12:46:05Z","file_size":203636,"content_type":"application/pdf","creator":"system","relation":"main_file","date_created":"2018-12-12T10:08:15Z"}],"scopus_import":1},{"quality_controlled":"1","user_id":"4435EBFC-F248-11E8-B48F-1D18A9856A87","author":[{"first_name":"Adrian","last_name":"Ion","id":"29F89302-F248-11E8-B48F-1D18A9856A87","full_name":"Ion, Adrian"},{"first_name":"Joao","last_name":"Carreira","full_name":"Carreira, Joao"},{"first_name":"Cristian","last_name":"Sminchisescu","full_name":"Sminchisescu, Cristian"}],"citation":{"apa":"Ion, A., Carreira, J., &#38; Sminchisescu, C. (2012). Image segmentation by figure-ground composition into maximal cliques. Presented at the ICCV: International Conference on Computer Vision, Barcelona, Spain: IEEE. <a href=\"https://doi.org/10.1109/ICCV.2011.6126486\">https://doi.org/10.1109/ICCV.2011.6126486</a>","mla":"Ion, Adrian, et al. <i>Image Segmentation by Figure-Ground Composition into Maximal Cliques</i>. 6126486, IEEE, 2012, doi:<a href=\"https://doi.org/10.1109/ICCV.2011.6126486\">10.1109/ICCV.2011.6126486</a>.","ama":"Ion A, Carreira J, Sminchisescu C. Image segmentation by figure-ground composition into maximal cliques. In: IEEE; 2012. doi:<a href=\"https://doi.org/10.1109/ICCV.2011.6126486\">10.1109/ICCV.2011.6126486</a>","ieee":"A. Ion, J. Carreira, and C. Sminchisescu, “Image segmentation by figure-ground composition into maximal cliques,” presented at the ICCV: International Conference on Computer Vision, Barcelona, Spain, 2012.","ista":"Ion A, Carreira J, Sminchisescu C. 2012. Image segmentation by figure-ground composition into maximal cliques. ICCV: International Conference on Computer Vision, 6126486.","short":"A. Ion, J. Carreira, C. Sminchisescu, in:, IEEE, 2012.","chicago":"Ion, Adrian, Joao Carreira, and Cristian Sminchisescu. “Image Segmentation by Figure-Ground Composition into Maximal Cliques.” IEEE, 2012. <a href=\"https://doi.org/10.1109/ICCV.2011.6126486\">https://doi.org/10.1109/ICCV.2011.6126486</a>."},"day":"12","year":"2012","date_updated":"2021-01-12T07:42:15Z","type":"conference","oa_version":"None","language":[{"iso":"eng"}],"doi":"10.1109/ICCV.2011.6126486","_id":"3265","department":[{"_id":"HeEd"}],"title":"Image segmentation by figure-ground composition into maximal cliques","publication_status":"published","abstract":[{"lang":"eng","text":"We propose a mid-level statistical model for image segmentation that composes multiple figure-ground hypotheses (FG) obtained by applying constraints at different locations and scales, into larger interpretations (tilings) of the entire image. Inference is cast as optimization over sets of maximal cliques sampled from a graph connecting all non-overlapping figure-ground segment hypotheses. Potential functions over cliques combine unary, Gestalt-based figure qualities, and pairwise compatibilities among spatially neighboring segments, constrained by T-junctions and the boundary interface statistics of real scenes. Learning the model parameters is based on maximum likelihood, alternating between sampling image tilings and optimizing their potential function parameters. State of the art results are reported on the Berkeley and Stanford segmentation datasets, as well as VOC2009, where a 28% improvement was achieved."}],"date_published":"2012-01-12T00:00:00Z","publisher":"IEEE","publist_id":"3382","article_number":"6126486","status":"public","date_created":"2018-12-11T12:02:21Z","month":"01","conference":{"end_date":"2011-11-13","name":"ICCV: International Conference on Computer Vision","location":"Barcelona, Spain","start_date":"2011-11-06"}},{"scopus_import":1,"page":"1436 - 1444","file":[{"relation":"main_file","date_created":"2018-12-12T10:15:00Z","file_size":280280,"creator":"system","content_type":"application/pdf","date_updated":"2020-07-14T12:46:06Z","file_id":"5116","file_name":"IST-2016-542-v1+1_2012-J-01-Poinculus.pdf","checksum":"d65f79775b51258a604ca5ec741297cc","access_level":"open_access"}],"date_published":"2012-08-01T00:00:00Z","acknowledgement":"Research by the third author is partially supported by the National Science Foundation (NSF) under grant DBI-0820624.","department":[{"_id":"HeEd"}],"has_accepted_license":"1","doi":"10.1016/j.patrec.2011.10.007","language":[{"iso":"eng"}],"day":"01","oa_version":"Submitted Version","date_updated":"2021-01-12T07:42:34Z","type":"journal_article","user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","status":"public","month":"08","date_created":"2018-12-11T12:02:36Z","publist_id":"3330","intvolume":"        33","publisher":"Elsevier","file_date_updated":"2020-07-14T12:46:06Z","pubrep_id":"542","issue":"11","volume":33,"abstract":[{"lang":"eng","text":"The theory of persistent homology opens up the possibility to reason about topological features of a space or a function quantitatively and in combinatorial terms. We refer to this new angle at a classical subject within algebraic topology as a point calculus, which we present for the family of interlevel sets of a real-valued function. Our account of the subject is expository, devoid of proofs, and written for non-experts in algebraic topology."}],"publication_status":"published","_id":"3310","oa":1,"ddc":["000"],"title":"A point calculus for interlevel set homology","publication":"Pattern Recognition Letters","year":"2012","quality_controlled":"1","author":[{"first_name":"Paul","last_name":"Bendich","full_name":"Bendich, Paul","id":"43F6EC54-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Cabello","first_name":"Sergio","full_name":"Cabello, Sergio"},{"id":"3FB178DA-F248-11E8-B48F-1D18A9856A87","full_name":"Edelsbrunner, Herbert","orcid":"0000-0002-9823-6833","last_name":"Edelsbrunner","first_name":"Herbert"}],"citation":{"apa":"Bendich, P., Cabello, S., &#38; Edelsbrunner, H. (2012). A point calculus for interlevel set homology. <i>Pattern Recognition Letters</i>. Elsevier. <a href=\"https://doi.org/10.1016/j.patrec.2011.10.007\">https://doi.org/10.1016/j.patrec.2011.10.007</a>","mla":"Bendich, Paul, et al. “A Point Calculus for Interlevel Set Homology.” <i>Pattern Recognition Letters</i>, vol. 33, no. 11, Elsevier, 2012, pp. 1436–44, doi:<a href=\"https://doi.org/10.1016/j.patrec.2011.10.007\">10.1016/j.patrec.2011.10.007</a>.","ama":"Bendich P, Cabello S, Edelsbrunner H. A point calculus for interlevel set homology. <i>Pattern Recognition Letters</i>. 2012;33(11):1436-1444. doi:<a href=\"https://doi.org/10.1016/j.patrec.2011.10.007\">10.1016/j.patrec.2011.10.007</a>","ieee":"P. Bendich, S. Cabello, and H. Edelsbrunner, “A point calculus for interlevel set homology,” <i>Pattern Recognition Letters</i>, vol. 33, no. 11. Elsevier, pp. 1436–1444, 2012.","ista":"Bendich P, Cabello S, Edelsbrunner H. 2012. A point calculus for interlevel set homology. Pattern Recognition Letters. 33(11), 1436–1444.","chicago":"Bendich, Paul, Sergio Cabello, and Herbert Edelsbrunner. “A Point Calculus for Interlevel Set Homology.” <i>Pattern Recognition Letters</i>. Elsevier, 2012. <a href=\"https://doi.org/10.1016/j.patrec.2011.10.007\">https://doi.org/10.1016/j.patrec.2011.10.007</a>.","short":"P. Bendich, S. Cabello, H. Edelsbrunner, Pattern Recognition Letters 33 (2012) 1436–1444."}},{"oa_version":"Preprint","type":"journal_article","date_updated":"2021-01-12T07:42:43Z","year":"2012","day":"01","main_file_link":[{"url":"http://arxiv.org/abs/1104.1510","open_access":"1"}],"citation":{"short":"M. Kerber, M. Sagraloff,  Journal of Symbolic Computation 47 (2012) 239–258.","chicago":"Kerber, Michael, and Michael Sagraloff. “A Worst Case Bound for Topology Computation of Algebraic Curves.” <i> Journal of Symbolic Computation</i>. Elsevier, 2012. <a href=\"https://doi.org/10.1016/j.jsc.2011.11.001\">https://doi.org/10.1016/j.jsc.2011.11.001</a>.","ista":"Kerber M, Sagraloff M. 2012. A worst case bound for topology computation of algebraic curves.  Journal of Symbolic Computation. 47(3), 239–258.","ieee":"M. Kerber and M. Sagraloff, “A worst case bound for topology computation of algebraic curves,” <i> Journal of Symbolic Computation</i>, vol. 47, no. 3. Elsevier, pp. 239–258, 2012.","ama":"Kerber M, Sagraloff M. A worst case bound for topology computation of algebraic curves. <i> Journal of Symbolic Computation</i>. 2012;47(3):239-258. doi:<a href=\"https://doi.org/10.1016/j.jsc.2011.11.001\">10.1016/j.jsc.2011.11.001</a>","mla":"Kerber, Michael, and Michael Sagraloff. “A Worst Case Bound for Topology Computation of Algebraic Curves.” <i> Journal of Symbolic Computation</i>, vol. 47, no. 3, Elsevier, 2012, pp. 239–58, doi:<a href=\"https://doi.org/10.1016/j.jsc.2011.11.001\">10.1016/j.jsc.2011.11.001</a>.","apa":"Kerber, M., &#38; Sagraloff, M. (2012). A worst case bound for topology computation of algebraic curves. <i> Journal of Symbolic Computation</i>. Elsevier. <a href=\"https://doi.org/10.1016/j.jsc.2011.11.001\">https://doi.org/10.1016/j.jsc.2011.11.001</a>"},"author":[{"id":"36E4574A-F248-11E8-B48F-1D18A9856A87","full_name":"Kerber, Michael","orcid":"0000-0002-8030-9299","first_name":"Michael","last_name":"Kerber"},{"first_name":"Michael","last_name":"Sagraloff","full_name":"Sagraloff, Michael"}],"user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","quality_controlled":"1","abstract":[{"lang":"eng","text":"Computing the topology of an algebraic plane curve C means computing a combinatorial graph that is isotopic to C and thus represents its topology in R2. We prove that, for a polynomial of degree n with integer coefficients bounded by 2ρ, the topology of the induced curve can be computed with  bit operations ( indicates that we omit logarithmic factors). Our analysis improves the previous best known complexity bounds by a factor of n2. The improvement is based on new techniques to compute and refine isolating intervals for the real roots of polynomials, and on the consequent amortized analysis of the critical fibers of the algebraic curve."}],"publication_status":"published","title":"A worst case bound for topology computation of algebraic curves","publication":" Journal of Symbolic Computation","department":[{"_id":"HeEd"}],"_id":"3331","language":[{"iso":"eng"}],"doi":"10.1016/j.jsc.2011.11.001","oa":1,"publisher":"Elsevier","date_published":"2012-03-01T00:00:00Z","issue":"3","page":"239 - 258","volume":47,"month":"03","date_created":"2018-12-11T12:02:43Z","status":"public","intvolume":"        47","scopus_import":1,"publist_id":"3303"},{"page":"286-293","date_published":"2011-08-01T00:00:00Z","publication_identifier":{"eissn":["16113349"],"isbn":["9783642236716"],"issn":["03029743"]},"scopus_import":"1","alternative_title":["LNCS"],"user_id":"6785fbc1-c503-11eb-8a32-93094b40e1cf","article_processing_charge":"No","day":"01","date_updated":"2021-08-12T13:53:17Z","type":"conference","oa_version":"Published Version","doi":"10.1007/978-3-642-23672-3_35","language":[{"iso":"eng"}],"department":[{"_id":"HeEd"}],"volume":6854,"publisher":"Springer Nature","intvolume":"      6854","status":"public","date_created":"2021-07-11T22:01:19Z","conference":{"end_date":"2011-08-31","name":"CAIP: International Conference on Computer Analysis of Images and Patterns","start_date":"2011-08-29","location":"Seville, Spain"},"month":"08","author":[{"first_name":"Rocio","last_name":"Gonzalez-Diaz","full_name":"Gonzalez-Diaz, Rocio"},{"first_name":"Adrian","last_name":"Ion","full_name":"Ion, Adrian","id":"29F89302-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Jimenez, Maria Jose","first_name":"Maria Jose","last_name":"Jimenez"},{"full_name":"Poyatos, Regina","first_name":"Regina","last_name":"Poyatos"}],"quality_controlled":"1","citation":{"ama":"Gonzalez-Diaz R, Ion A, Jimenez MJ, Poyatos R. Incremental-decremental algorithm for computing AT-models and persistent homology. In: <i>Computer Analysis of Images and Patterns</i>. Vol 6854. Springer Nature; 2011:286-293. doi:<a href=\"https://doi.org/10.1007/978-3-642-23672-3_35\">10.1007/978-3-642-23672-3_35</a>","ieee":"R. Gonzalez-Diaz, A. Ion, M. J. Jimenez, and R. Poyatos, “Incremental-decremental algorithm for computing AT-models and persistent homology,” in <i>Computer Analysis of Images and Patterns</i>, Seville, Spain, 2011, vol. 6854, pp. 286–293.","chicago":"Gonzalez-Diaz, Rocio, Adrian Ion, Maria Jose Jimenez, and Regina Poyatos. “Incremental-Decremental Algorithm for Computing AT-Models and Persistent Homology.” In <i>Computer Analysis of Images and Patterns</i>, 6854:286–93. Springer Nature, 2011. <a href=\"https://doi.org/10.1007/978-3-642-23672-3_35\">https://doi.org/10.1007/978-3-642-23672-3_35</a>.","short":"R. Gonzalez-Diaz, A. Ion, M.J. Jimenez, R. Poyatos, in:, Computer Analysis of Images and Patterns, Springer Nature, 2011, pp. 286–293.","ista":"Gonzalez-Diaz R, Ion A, Jimenez MJ, Poyatos R. 2011. Incremental-decremental algorithm for computing AT-models and persistent homology. Computer Analysis of Images and Patterns. CAIP: International Conference on Computer Analysis of Images and Patterns, LNCS, vol. 6854, 286–293.","mla":"Gonzalez-Diaz, Rocio, et al. “Incremental-Decremental Algorithm for Computing AT-Models and Persistent Homology.” <i>Computer Analysis of Images and Patterns</i>, vol. 6854, Springer Nature, 2011, pp. 286–93, doi:<a href=\"https://doi.org/10.1007/978-3-642-23672-3_35\">10.1007/978-3-642-23672-3_35</a>.","apa":"Gonzalez-Diaz, R., Ion, A., Jimenez, M. J., &#38; Poyatos, R. (2011). Incremental-decremental algorithm for computing AT-models and persistent homology. In <i>Computer Analysis of Images and Patterns</i> (Vol. 6854, pp. 286–293). Seville, Spain: Springer Nature. <a href=\"https://doi.org/10.1007/978-3-642-23672-3_35\">https://doi.org/10.1007/978-3-642-23672-3_35</a>"},"main_file_link":[{"url":"http://hdl.handle.net/11441/30766","open_access":"1"}],"year":"2011","oa":1,"_id":"9648","title":"Incremental-decremental algorithm for computing AT-models and persistent homology","publication":"Computer Analysis of Images and Patterns","publication_status":"published","abstract":[{"text":"In this paper, we establish a correspondence between the incremental algorithm for computing AT-models [8,9] and the one for computing persistent homology [6,14,15]. We also present a decremental algorithm for computing AT-models that allows to extend the persistence computation to a wider setting. Finally, we show how to combine incremental and decremental techniques for persistent homology computation.","lang":"eng"}]},{"page":"215-224","date_published":"2011-06-01T00:00:00Z","publication_identifier":{"issn":["0302-9743"],"eisbn":["9783642208447"],"isbn":["9783642208430"],"eissn":["1611-3349"]},"scopus_import":"1","alternative_title":["LNCS"],"day":"01","type":"conference","series_title":"LNIP","date_updated":"2023-09-05T14:10:15Z","oa_version":"None","article_processing_charge":"No","user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","acknowledgement":"This work has been partially supported by the Austrian Science Fund under grants S9103-N13 and P18716-N13.","doi":"10.1007/978-3-642-20844-7_22","language":[{"iso":"eng"}],"department":[{"_id":"HeEd"}],"publisher":"Springer","editor":[{"first_name":"Xiaoyi","last_name":"Jiang","full_name":"Jiang, Xiaoyi"},{"full_name":"Ferrer, Miquel","first_name":"Miquel","last_name":"Ferrer"},{"full_name":"Torsello, Andrea","last_name":"Torsello","first_name":"Andrea"}],"volume":6658,"status":"public","date_created":"2022-03-21T08:08:35Z","conference":{"end_date":"2011-05-20","name":"GbRPR: Graph-based Representations in Pattern Recognition","location":"Münster, Germany","start_date":"2011-05-18"},"month":"06","place":"Berlin, Heidelberg","intvolume":"      6658","year":"2011","author":[{"full_name":"Artner, Nicole M.","first_name":"Nicole M.","last_name":"Artner"},{"id":"29F89302-F248-11E8-B48F-1D18A9856A87","full_name":"Ion, Adrian","first_name":"Adrian","last_name":"Ion"},{"full_name":"Kropatsch, Walter G.","last_name":"Kropatsch","first_name":"Walter G."}],"quality_controlled":"1","citation":{"short":"N.M. Artner, A. Ion, W.G. Kropatsch, in:, X. Jiang, M. Ferrer, A. Torsello (Eds.), Graph-Based Representations in Pattern Recognition, Springer, Berlin, Heidelberg, 2011, pp. 215–224.","chicago":"Artner, Nicole M., Adrian Ion, and Walter G. Kropatsch. “Spatio-Temporal Extraction of Articulated Models in a Graph Pyramid.” In <i>Graph-Based Representations in Pattern Recognition</i>, edited by Xiaoyi Jiang, Miquel Ferrer, and Andrea Torsello, 6658:215–24. LNIP. Berlin, Heidelberg: Springer, 2011. <a href=\"https://doi.org/10.1007/978-3-642-20844-7_22\">https://doi.org/10.1007/978-3-642-20844-7_22</a>.","ista":"Artner NM, Ion A, Kropatsch WG. 2011. Spatio-temporal extraction of articulated models in a graph pyramid. Graph-Based Representations in Pattern Recognition. GbRPR: Graph-based Representations in Pattern RecognitionLNIP, LNCS, vol. 6658, 215–224.","ieee":"N. M. Artner, A. Ion, and W. G. Kropatsch, “Spatio-temporal extraction of articulated models in a graph pyramid,” in <i>Graph-Based Representations in Pattern Recognition</i>, Münster, Germany, 2011, vol. 6658, pp. 215–224.","ama":"Artner NM, Ion A, Kropatsch WG. Spatio-temporal extraction of articulated models in a graph pyramid. In: Jiang X, Ferrer M, Torsello A, eds. <i>Graph-Based Representations in Pattern Recognition</i>. Vol 6658. LNIP. Berlin, Heidelberg: Springer; 2011:215-224. doi:<a href=\"https://doi.org/10.1007/978-3-642-20844-7_22\">10.1007/978-3-642-20844-7_22</a>","apa":"Artner, N. M., Ion, A., &#38; Kropatsch, W. G. (2011). Spatio-temporal extraction of articulated models in a graph pyramid. In X. Jiang, M. Ferrer, &#38; A. Torsello (Eds.), <i>Graph-Based Representations in Pattern Recognition</i> (Vol. 6658, pp. 215–224). Berlin, Heidelberg: Springer. <a href=\"https://doi.org/10.1007/978-3-642-20844-7_22\">https://doi.org/10.1007/978-3-642-20844-7_22</a>","mla":"Artner, Nicole M., et al. “Spatio-Temporal Extraction of Articulated Models in a Graph Pyramid.” <i>Graph-Based Representations in Pattern Recognition</i>, edited by Xiaoyi Jiang et al., vol. 6658, Springer, 2011, pp. 215–24, doi:<a href=\"https://doi.org/10.1007/978-3-642-20844-7_22\">10.1007/978-3-642-20844-7_22</a>."},"publication_status":"published","abstract":[{"text":"This paper presents a method to create a model of an articulated object using the planar motion in an initialization video. The model consists of rigid parts connected by points of articulation. The rigid parts are described by the positions of salient feature-points tracked throughout the video. Following a filtering step that identifies points that belong to different objects, rigid parts are found by a grouping process in a graph pyramid. Valid articulation points are selected by verifying multiple hypotheses for each pair of parts.","lang":"eng"}],"_id":"10907","title":"Spatio-temporal extraction of articulated models in a graph pyramid","publication":"Graph-Based Representations in Pattern Recognition"},{"status":"public","conference":{"start_date":"2011-12-12","location":"Granada, Spain","name":"NIPS: Neural Information Processing Systems","end_date":"2011-12-14"},"month":"12","date_created":"2018-12-11T12:02:21Z","scopus_import":1,"publist_id":"3381","intvolume":"        24","publisher":"Neural Information Processing Systems Foundation","page":"1827 - 1835","volume":24,"date_published":"2011-12-01T00:00:00Z","abstract":[{"lang":"eng","text":"We present a joint image segmentation and labeling model (JSL) which, given a bag of figure-ground segment hypotheses extracted at multiple image locations and scales, constructs a joint probability distribution over both the compatible image interpretations (tilings or image segmentations) composed from those segments, and over their labeling into categories. The process of drawing samples from the joint distribution can be interpreted as first sampling tilings, modeled as maximal cliques, from a graph connecting spatially non-overlapping segments in the bag [1], followed by sampling labels for those segments, conditioned on the choice of a particular tiling. We learn the segmentation and labeling parameters jointly, based on Maximum Likelihood with a novel Incremental Saddle Point estimation procedure. The partition function over tilings and labelings is increasingly more accurately approximated by including incorrect configurations that a not-yet-competent model rates probable during learning. We show that the proposed methodologymatches the current state of the art in the Stanford dataset [2], as well as in VOC2010, where 41.7% accuracy on the test set is achieved."}],"publication_status":"published","_id":"3266","department":[{"_id":"HeEd"}],"language":[{"iso":"eng"}],"title":"Probabilistic joint image segmentation and labeling","publication":"NIPS Proceedings","year":"2011","day":"01","oa_version":"None","date_updated":"2021-01-12T07:42:15Z","type":"conference","quality_controlled":"1","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","author":[{"full_name":"Ion, Adrian","id":"29F89302-F248-11E8-B48F-1D18A9856A87","first_name":"Adrian","last_name":"Ion"},{"full_name":"Carreira, Joao","first_name":"Joao","last_name":"Carreira"},{"first_name":"Cristian","last_name":"Sminchisescu","full_name":"Sminchisescu, Cristian"}],"citation":{"ista":"Ion A, Carreira J, Sminchisescu C. 2011. Probabilistic joint image segmentation and labeling. NIPS Proceedings. NIPS: Neural Information Processing Systems vol. 24, 1827–1835.","short":"A. Ion, J. Carreira, C. Sminchisescu, in:, NIPS Proceedings, Neural Information Processing Systems Foundation, 2011, pp. 1827–1835.","chicago":"Ion, Adrian, Joao Carreira, and Cristian Sminchisescu. “Probabilistic Joint Image Segmentation and Labeling.” In <i>NIPS Proceedings</i>, 24:1827–35. Neural Information Processing Systems Foundation, 2011.","ieee":"A. Ion, J. Carreira, and C. Sminchisescu, “Probabilistic joint image segmentation and labeling,” in <i>NIPS Proceedings</i>, Granada, Spain, 2011, vol. 24, pp. 1827–1835.","ama":"Ion A, Carreira J, Sminchisescu C. Probabilistic joint image segmentation and labeling. In: <i>NIPS Proceedings</i>. Vol 24. Neural Information Processing Systems Foundation; 2011:1827-1835.","apa":"Ion, A., Carreira, J., &#38; Sminchisescu, C. (2011). Probabilistic joint image segmentation and labeling. In <i>NIPS Proceedings</i> (Vol. 24, pp. 1827–1835). Granada, Spain: Neural Information Processing Systems Foundation.","mla":"Ion, Adrian, et al. “Probabilistic Joint Image Segmentation and Labeling.” <i>NIPS Proceedings</i>, vol. 24, Neural Information Processing Systems Foundation, 2011, pp. 1827–35."}},{"month":"01","date_created":"2018-12-11T12:02:21Z","status":"public","intvolume":"        45","scopus_import":1,"publist_id":"3379","publisher":"Springer","date_published":"2011-01-14T00:00:00Z","issue":"3","page":"425 - 448","volume":45,"abstract":[{"lang":"eng","text":"We address the problem of localizing homology classes, namely, finding the cycle representing a given class with the most concise geometric measure. We study the problem with different measures: volume, diameter and radius. For volume, that is, the 1-norm of a cycle, two main results are presented. First, we prove that the problem is NP-hard to approximate within any constant factor. Second, we prove that for homology of dimension two or higher, the problem is NP-hard to approximate even when the Betti number is O(1). The latter result leads to the inapproximability of the problem of computing the nonbounding cycle with the smallest volume and computing cycles representing a homology basis with the minimal total volume. As for the other two measures defined by pairwise geodesic distance, diameter and radius, we show that the localization problem is NP-hard for diameter but is polynomial for radius. Our work is restricted to homology over the ℤ2 field."}],"publication_status":"published","publication":"Discrete & Computational Geometry","title":"Hardness results for homology localization","_id":"3267","department":[{"_id":"HeEd"}],"doi":"10.1007/s00454-010-9322-8","related_material":{"record":[{"relation":"earlier_version","status":"public","id":"10909"}]},"language":[{"iso":"eng"}],"oa_version":"None","type":"journal_article","date_updated":"2023-02-21T16:07:10Z","year":"2011","day":"14","citation":{"apa":"Chen, C., &#38; Freedman, D. (2011). Hardness results for homology localization. <i>Discrete &#38; Computational Geometry</i>. Springer. <a href=\"https://doi.org/10.1007/s00454-010-9322-8\">https://doi.org/10.1007/s00454-010-9322-8</a>","mla":"Chen, Chao, and Daniel Freedman. “Hardness Results for Homology Localization.” <i>Discrete &#38; Computational Geometry</i>, vol. 45, no. 3, Springer, 2011, pp. 425–48, doi:<a href=\"https://doi.org/10.1007/s00454-010-9322-8\">10.1007/s00454-010-9322-8</a>.","ieee":"C. Chen and D. Freedman, “Hardness results for homology localization,” <i>Discrete &#38; Computational Geometry</i>, vol. 45, no. 3. Springer, pp. 425–448, 2011.","ama":"Chen C, Freedman D. Hardness results for homology localization. <i>Discrete &#38; Computational Geometry</i>. 2011;45(3):425-448. doi:<a href=\"https://doi.org/10.1007/s00454-010-9322-8\">10.1007/s00454-010-9322-8</a>","chicago":"Chen, Chao, and Daniel Freedman. “Hardness Results for Homology Localization.” <i>Discrete &#38; Computational Geometry</i>. Springer, 2011. <a href=\"https://doi.org/10.1007/s00454-010-9322-8\">https://doi.org/10.1007/s00454-010-9322-8</a>.","short":"C. Chen, D. Freedman, Discrete &#38; Computational Geometry 45 (2011) 425–448.","ista":"Chen C, Freedman D. 2011. Hardness results for homology localization. Discrete &#38; Computational Geometry. 45(3), 425–448."},"author":[{"first_name":"Chao","last_name":"Chen","full_name":"Chen, Chao","id":"3E92416E-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Daniel","last_name":"Freedman","full_name":"Freedman, Daniel"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","quality_controlled":"1"},{"day":"19","date_updated":"2021-01-12T07:42:16Z","type":"journal_article","oa_version":"Published Version","article_processing_charge":"No","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","doi":"10.1111/j.1467-8659.2011.01985.x","language":[{"iso":"eng"}],"department":[{"_id":"HeEd"}],"page":"1261 - 1268","date_published":"2011-07-19T00:00:00Z","scopus_import":1,"year":"2011","author":[{"full_name":"Sheng, Yu","first_name":"Yu","last_name":"Sheng"},{"full_name":"Cutler, Barbara","last_name":"Cutler","first_name":"Barbara"},{"full_name":"Chen, Chao","id":"3E92416E-F248-11E8-B48F-1D18A9856A87","first_name":"Chao","last_name":"Chen"},{"first_name":"Joshua","last_name":"Nasman","full_name":"Nasman, Joshua"}],"quality_controlled":"1","main_file_link":[{"open_access":"1","url":"http://www.cs.cmu.edu/%7Eshengyu/download/egsr2011_paper.pdf"}],"citation":{"mla":"Sheng, Yu, et al. “Perceptual Global Illumination Cancellation in Complex Projection Environments.” <i>Computer Graphics Forum</i>, vol. 30, no. 4, Wiley-Blackwell, 2011, pp. 1261–68, doi:<a href=\"https://doi.org/10.1111/j.1467-8659.2011.01985.x\">10.1111/j.1467-8659.2011.01985.x</a>.","apa":"Sheng, Y., Cutler, B., Chen, C., &#38; Nasman, J. (2011). Perceptual global illumination cancellation in complex projection environments. <i>Computer Graphics Forum</i>. Wiley-Blackwell. <a href=\"https://doi.org/10.1111/j.1467-8659.2011.01985.x\">https://doi.org/10.1111/j.1467-8659.2011.01985.x</a>","ieee":"Y. Sheng, B. Cutler, C. Chen, and J. Nasman, “Perceptual global illumination cancellation in complex projection environments,” <i>Computer Graphics Forum</i>, vol. 30, no. 4. Wiley-Blackwell, pp. 1261–1268, 2011.","ama":"Sheng Y, Cutler B, Chen C, Nasman J. Perceptual global illumination cancellation in complex projection environments. <i>Computer Graphics Forum</i>. 2011;30(4):1261-1268. doi:<a href=\"https://doi.org/10.1111/j.1467-8659.2011.01985.x\">10.1111/j.1467-8659.2011.01985.x</a>","short":"Y. Sheng, B. Cutler, C. Chen, J. Nasman, Computer Graphics Forum 30 (2011) 1261–1268.","chicago":"Sheng, Yu, Barbara Cutler, Chao Chen, and Joshua Nasman. “Perceptual Global Illumination Cancellation in Complex Projection Environments.” <i>Computer Graphics Forum</i>. Wiley-Blackwell, 2011. <a href=\"https://doi.org/10.1111/j.1467-8659.2011.01985.x\">https://doi.org/10.1111/j.1467-8659.2011.01985.x</a>.","ista":"Sheng Y, Cutler B, Chen C, Nasman J. 2011. Perceptual global illumination cancellation in complex projection environments. Computer Graphics Forum. 30(4), 1261–1268."},"publication_status":"published","abstract":[{"lang":"eng","text":"The unintentional scattering of light between neighboring surfaces in complex projection environments increases the brightness and decreases the contrast, disrupting the appearance of the desired imagery. To achieve satisfactory projection results, the inverse problem of global illumination must be solved to cancel this secondary scattering. In this paper, we propose a global illumination cancellation method that minimizes the perceptual difference between the desired imagery and the actual total illumination in the resulting physical environment. Using Gauss-Newton and active set methods, we design a fast solver for the bound constrained nonlinear least squares problem raised by the perceptual error metrics. Our solver is further accelerated with a CUDA implementation and multi-resolution method to achieve 1–2 fps for problems with approximately 3000 variables. We demonstrate the global illumination cancellation algorithm with our multi-projector system. Results show that our method preserves the color fidelity of the desired imagery significantly better than previous methods."}],"oa":1,"_id":"3269","publication":"Computer Graphics Forum","title":"Perceptual global illumination cancellation in complex projection environments","publisher":"Wiley-Blackwell","article_type":"original","volume":30,"issue":"4","status":"public","date_created":"2018-12-11T12:02:22Z","month":"07","publist_id":"3377","intvolume":"        30"},{"department":[{"_id":"HeEd"}],"_id":"3270","language":[{"iso":"eng"}],"title":"Persistent homology computation with a twist","abstract":[{"text":"The persistence diagram of a filtered simplicial com- plex is usually computed by reducing the boundary matrix of the complex. We introduce a simple op- timization technique: by processing the simplices of the complex in decreasing dimension, we can “kill” columns (i.e., set them to zero) without reducing them. This technique completely avoids reduction on roughly half of the columns. We demonstrate that this idea significantly improves the running time of the reduction algorithm in practice. We also give an output-sensitive complexity analysis for the new al- gorithm which yields to sub-cubic asymptotic bounds under certain assumptions.","lang":"eng"}],"publication_status":"published","user_id":"4435EBFC-F248-11E8-B48F-1D18A9856A87","author":[{"last_name":"Chen","first_name":"Chao","full_name":"Chen, Chao","id":"3E92416E-F248-11E8-B48F-1D18A9856A87"},{"orcid":"0000-0002-8030-9299","full_name":"Kerber, Michael","id":"36E4574A-F248-11E8-B48F-1D18A9856A87","first_name":"Michael","last_name":"Kerber"}],"quality_controlled":"1","citation":{"ieee":"C. Chen and M. Kerber, “Persistent homology computation with a twist,” presented at the EuroCG: European Workshop on Computational Geometry, Morschach, Switzerland, 2011, pp. 197–200.","ama":"Chen C, Kerber M. Persistent homology computation with a twist. In: TU Dortmund; 2011:197-200.","ista":"Chen C, Kerber M. 2011. Persistent homology computation with a twist. EuroCG: European Workshop on Computational Geometry, 197–200.","chicago":"Chen, Chao, and Michael Kerber. “Persistent Homology Computation with a Twist,” 197–200. TU Dortmund, 2011.","short":"C. Chen, M. Kerber, in:, TU Dortmund, 2011, pp. 197–200.","mla":"Chen, Chao, and Michael Kerber. <i>Persistent Homology Computation with a Twist</i>. TU Dortmund, 2011, pp. 197–200.","apa":"Chen, C., &#38; Kerber, M. (2011). Persistent homology computation with a twist (pp. 197–200). Presented at the EuroCG: European Workshop on Computational Geometry, Morschach, Switzerland: TU Dortmund."},"year":"2011","day":"01","oa_version":"None","date_updated":"2021-01-12T07:42:17Z","type":"conference","publist_id":"3376","status":"public","month":"01","conference":{"name":"EuroCG: European Workshop on Computational Geometry","end_date":"2011-03-30","start_date":"2011-03-28","location":"Morschach, Switzerland"},"date_created":"2018-12-11T12:02:22Z","page":"197 - 200","date_published":"2011-01-01T00:00:00Z","publisher":"TU Dortmund"},{"status":"public","month":"11","date_created":"2018-12-11T12:02:23Z","scopus_import":1,"publist_id":"3375","alternative_title":["Theory, Algorithms, and Applications"],"editor":[{"full_name":"Peikert, Ronald","first_name":"Ronald","last_name":"Peikert"},{"first_name":"Helwig","last_name":"Hauser","full_name":"Hauser, Helwig"},{"full_name":"Carr, Hamish","first_name":"Hamish","last_name":"Carr"},{"last_name":"Fuchs","first_name":"Raphael","full_name":"Fuchs, Raphael"}],"publisher":"Springer","page":"91 - 106","date_published":"2011-11-14T00:00:00Z","abstract":[{"lang":"eng","text":"In this paper we present an efficient framework for computation of persis- tent homology of cubical data in arbitrary dimensions. An existing algorithm using simplicial complexes is adapted to the setting of cubical complexes. The proposed approach enables efficient application of persistent homology in domains where the data is naturally given in a cubical form. By avoiding triangulation of the data, we significantly reduce the size of the complex. We also present a data-structure de- signed to compactly store and quickly manipulate cubical complexes. By means of numerical experiments, we show high speed and memory efficiency of our ap- proach. We compare our framework to other available implementations, showing its superiority. Finally, we report performance on selected 3D and 4D data-sets."}],"publication_status":"published","_id":"3271","department":[{"_id":"HeEd"}],"doi":"10.1007/978-3-642-23175-9_7","language":[{"iso":"eng"}],"title":"Efficient computation of persistent homology for cubical data","publication":"Topological Methods in Data Analysis and Visualization II","year":"2011","day":"14","oa_version":"None","type":"book_chapter","date_updated":"2021-01-12T07:42:18Z","quality_controlled":"1","author":[{"last_name":"Wagner","first_name":"Hubert","full_name":"Wagner, Hubert"},{"last_name":"Chen","first_name":"Chao","id":"3E92416E-F248-11E8-B48F-1D18A9856A87","full_name":"Chen, Chao"},{"last_name":"Vuçini","first_name":"Erald","full_name":"Vuçini, Erald"}],"user_id":"4435EBFC-F248-11E8-B48F-1D18A9856A87","citation":{"ama":"Wagner H, Chen C, Vuçini E. Efficient computation of persistent homology for cubical data. In: Peikert R, Hauser H, Carr H, Fuchs R, eds. <i>Topological Methods in Data Analysis and Visualization II</i>. Springer; 2011:91-106. doi:<a href=\"https://doi.org/10.1007/978-3-642-23175-9_7\">10.1007/978-3-642-23175-9_7</a>","ieee":"H. Wagner, C. Chen, and E. Vuçini, “Efficient computation of persistent homology for cubical data,” in <i>Topological Methods in Data Analysis and Visualization II</i>, R. Peikert, H. Hauser, H. Carr, and R. Fuchs, Eds. Springer, 2011, pp. 91–106.","ista":"Wagner H, Chen C, Vuçini E. 2011.Efficient computation of persistent homology for cubical data. In: Topological Methods in Data Analysis and Visualization II. Theory, Algorithms, and Applications, , 91–106.","chicago":"Wagner, Hubert, Chao Chen, and Erald Vuçini. “Efficient Computation of Persistent Homology for Cubical Data.” In <i>Topological Methods in Data Analysis and Visualization II</i>, edited by Ronald Peikert, Helwig Hauser, Hamish Carr, and Raphael Fuchs, 91–106. Springer, 2011. <a href=\"https://doi.org/10.1007/978-3-642-23175-9_7\">https://doi.org/10.1007/978-3-642-23175-9_7</a>.","short":"H. Wagner, C. Chen, E. Vuçini, in:, R. Peikert, H. Hauser, H. Carr, R. Fuchs (Eds.), Topological Methods in Data Analysis and Visualization II, Springer, 2011, pp. 91–106.","apa":"Wagner, H., Chen, C., &#38; Vuçini, E. (2011). Efficient computation of persistent homology for cubical data. In R. Peikert, H. Hauser, H. Carr, &#38; R. Fuchs (Eds.), <i>Topological Methods in Data Analysis and Visualization II</i> (pp. 91–106). Springer. <a href=\"https://doi.org/10.1007/978-3-642-23175-9_7\">https://doi.org/10.1007/978-3-642-23175-9_7</a>","mla":"Wagner, Hubert, et al. “Efficient Computation of Persistent Homology for Cubical Data.” <i>Topological Methods in Data Analysis and Visualization II</i>, edited by Ronald Peikert et al., Springer, 2011, pp. 91–106, doi:<a href=\"https://doi.org/10.1007/978-3-642-23175-9_7\">10.1007/978-3-642-23175-9_7</a>."}},{"publication_status":"inpress","abstract":[{"text":"Alpha shapes have been conceived in 1981 as an attempt to define the shape of a finite set of point in the plane. Since then, connections to diverse areas in the sciences and engineering have developed, including to pattern recognition, digital shape sampling and processing, and structural molecular biology. This survey begins with a historical account and discusses geometric, algorithmic, topological, and combinatorial aspects of alpha shapes in this sequence.","lang":"eng"}],"title":"Alpha shapes - a survey","publication":"Tessellations in the Sciences: Virtues, Techniques and Applications of Geometric Tilings","ddc":["510"],"oa":1,"language":[{"iso":"eng"}],"_id":"3311","department":[{"_id":"HeEd"}],"has_accepted_license":"1","date_updated":"2022-05-24T07:56:30Z","type":"book_chapter","oa_version":"Submitted Version","day":"31","year":"2011","citation":{"ama":"Edelsbrunner H. Alpha shapes - a survey. In: van de Weygaert R, Vegter G, Ritzerveld J, Icke V, eds. <i>Tessellations in the Sciences: Virtues, Techniques and Applications of Geometric Tilings</i>. Springer.","ieee":"H. Edelsbrunner, “Alpha shapes - a survey,” in <i>Tessellations in the Sciences: Virtues, Techniques and Applications of Geometric Tilings</i>, R. van de Weygaert, G. Vegter, J. Ritzerveld, and V. Icke, Eds. Springer.","short":"H. Edelsbrunner, in:, R. van de Weygaert, G. Vegter, J. Ritzerveld, V. Icke (Eds.), Tessellations in the Sciences: Virtues, Techniques and Applications of Geometric Tilings, Springer, n.d.","chicago":"Edelsbrunner, Herbert. “Alpha Shapes - a Survey.” In <i>Tessellations in the Sciences: Virtues, Techniques and Applications of Geometric Tilings</i>, edited by R van de Weygaert, G Vegter, J Ritzerveld, and V Icke. Springer, n.d.","ista":"Edelsbrunner H.Alpha shapes - a survey. In: Tessellations in the Sciences: Virtues, Techniques and Applications of Geometric Tilings. .","apa":"Edelsbrunner, H. (n.d.). Alpha shapes - a survey. In R. van de Weygaert, G. Vegter, J. Ritzerveld, &#38; V. Icke (Eds.), <i>Tessellations in the Sciences: Virtues, Techniques and Applications of Geometric Tilings</i>. Springer.","mla":"Edelsbrunner, Herbert. “Alpha Shapes - a Survey.” <i>Tessellations in the Sciences: Virtues, Techniques and Applications of Geometric Tilings</i>, edited by R van de Weygaert et al., Springer."},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","quality_controlled":"1","article_processing_charge":"No","author":[{"full_name":"Edelsbrunner, Herbert","orcid":"0000-0002-9823-6833","id":"3FB178DA-F248-11E8-B48F-1D18A9856A87","first_name":"Herbert","last_name":"Edelsbrunner"}],"date_created":"2018-12-11T12:02:36Z","month":"12","status":"public","publist_id":"3329","file_date_updated":"2022-05-24T07:55:05Z","publisher":"Springer","editor":[{"last_name":"van de Weygaert","first_name":"R","full_name":"van de Weygaert, R"},{"first_name":"G","last_name":"Vegter","full_name":"Vegter, G"},{"full_name":"Ritzerveld, J","first_name":"J","last_name":"Ritzerveld"},{"first_name":"V","last_name":"Icke","full_name":"Icke, V"}],"date_published":"2011-12-31T00:00:00Z","file":[{"relation":"main_file","date_created":"2022-05-24T07:55:05Z","file_size":475254,"creator":"dernst","content_type":"application/pdf","success":1,"file_id":"11408","date_updated":"2022-05-24T07:55:05Z","file_name":"2010_AlphaShapes.pdf","checksum":"a592ea438351e7280eea993a7713ab8f","access_level":"open_access"}]},{"title":"Detailed reconstruction of 3D plant root shape","publication":"Proceedings of the IEEE International Conference on Computer Vision","_id":"3312","oa":1,"ddc":["000"],"abstract":[{"lang":"eng","text":"We study the 3D reconstruction of plant roots from multiple 2D images. To meet the challenge caused by the delicate nature of thin branches, we make three innovations to cope with the sensitivity to image quality and calibration. First, we model the background as a harmonic function to improve the segmentation of the root in each 2D image. Second, we develop the concept of the regularized visual hull which reduces the effect of jittering and refraction by ensuring consistency with one 2D image. Third, we guarantee connectedness through adjustments to the 3D reconstruction that minimize global error. Our software is part of a biological phenotype/genotype study of agricultural root systems. It has been tested on more than 40 plant roots and results are promising in terms of reconstruction quality and efficiency."}],"publication_status":"published","citation":{"ama":"Zheng Y, Gu S, Edelsbrunner H, Tomasi C, Benfey P. <i>Detailed Reconstruction of 3D Plant Root Shape</i>. IEEE; 2011. doi:<a href=\"https://doi.org/10.1109/ICCV.2011.6126475\">10.1109/ICCV.2011.6126475</a>","ieee":"Y. Zheng, S. Gu, H. Edelsbrunner, C. Tomasi, and P. Benfey, <i>Detailed reconstruction of 3D plant root shape</i>. IEEE, 2011.","ista":"Zheng Y, Gu S, Edelsbrunner H, Tomasi C, Benfey P. 2011. Detailed reconstruction of 3D plant root shape, IEEE,p.","short":"Y. Zheng, S. Gu, H. Edelsbrunner, C. Tomasi, P. Benfey, Detailed Reconstruction of 3D Plant Root Shape, IEEE, 2011.","chicago":"Zheng, Ying, Steve Gu, Herbert Edelsbrunner, Carlo Tomasi, and Philip Benfey. <i>Detailed Reconstruction of 3D Plant Root Shape</i>. <i>Proceedings of the IEEE International Conference on Computer Vision</i>. IEEE, 2011. <a href=\"https://doi.org/10.1109/ICCV.2011.6126475\">https://doi.org/10.1109/ICCV.2011.6126475</a>.","mla":"Zheng, Ying, et al. “Detailed Reconstruction of 3D Plant Root Shape.” <i>Proceedings of the IEEE International Conference on Computer Vision</i>, 6126475, IEEE, 2011, doi:<a href=\"https://doi.org/10.1109/ICCV.2011.6126475\">10.1109/ICCV.2011.6126475</a>.","apa":"Zheng, Y., Gu, S., Edelsbrunner, H., Tomasi, C., &#38; Benfey, P. (2011). <i>Detailed reconstruction of 3D plant root shape</i>. <i>Proceedings of the IEEE International Conference on Computer Vision</i>. Barcelona, Spain: IEEE. <a href=\"https://doi.org/10.1109/ICCV.2011.6126475\">https://doi.org/10.1109/ICCV.2011.6126475</a>"},"quality_controlled":"1","author":[{"first_name":"Ying","last_name":"Zheng","full_name":"Zheng, Ying"},{"full_name":"Gu, Steve","first_name":"Steve","last_name":"Gu"},{"full_name":"Edelsbrunner, Herbert","orcid":"0000-0002-9823-6833","id":"3FB178DA-F248-11E8-B48F-1D18A9856A87","first_name":"Herbert","last_name":"Edelsbrunner"},{"full_name":"Tomasi, Carlo","first_name":"Carlo","last_name":"Tomasi"},{"full_name":"Benfey, Philip","last_name":"Benfey","first_name":"Philip"}],"year":"2011","publist_id":"3328","conference":{"name":"ICCV: International Conference on Computer Vision","end_date":"2011-11-13","location":"Barcelona, Spain","start_date":"2011-11-06"},"month":"12","date_created":"2018-12-11T12:02:36Z","article_number":"6126475","status":"public","pubrep_id":"541","file_date_updated":"2020-07-14T12:46:07Z","publisher":"IEEE","has_accepted_license":"1","department":[{"_id":"HeEd"}],"language":[{"iso":"eng"}],"doi":"10.1109/ICCV.2011.6126475","acknowledgement":"This research is supported by the National Science Foundation (NSF) under grant DBI-0820624.","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","article_processing_charge":"No","oa_version":"Submitted Version","date_updated":"2020-07-14T23:03:43Z","type":"conference_poster","day":"31","file":[{"relation":"main_file","date_created":"2018-12-12T10:09:04Z","file_size":5622728,"content_type":"application/pdf","creator":"system","file_id":"4727","date_updated":"2020-07-14T12:46:07Z","checksum":"30a33564b7b45a7ee31610898267fd0e","file_name":"IST-2016-541-v1+1_2011-P-07-RootReconstruction.pdf","access_level":"open_access"}],"date_published":"2011-12-31T00:00:00Z"},{"user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","oa_version":"Submitted Version","type":"conference","date_updated":"2021-01-12T07:42:35Z","day":"06","department":[{"_id":"HeEd"}],"has_accepted_license":"1","language":[{"iso":"eng"}],"doi":"10.1109/ICCV.2011.6126271","file":[{"file_name":"IST-2016-540-v1+1_2011-P-08-RunEmpty.pdf","checksum":"6984684081ba123808b344f9f2e64a8f","access_level":"open_access","file_id":"5282","date_updated":"2020-07-14T12:46:07Z","file_size":614050,"content_type":"application/pdf","creator":"system","relation":"main_file","date_created":"2018-12-12T10:17:28Z"}],"date_published":"2011-11-06T00:00:00Z","scopus_import":1,"citation":{"mla":"Chen, Chao, and Herbert Edelsbrunner. “Diffusion Runs Low on Persistence Fast.” <i>Proceedings of the IEEE International Conference on Computer Vision</i>, 6126271, IEEE, 2011, doi:<a href=\"https://doi.org/10.1109/ICCV.2011.6126271\">10.1109/ICCV.2011.6126271</a>.","apa":"Chen, C., &#38; Edelsbrunner, H. (2011). Diffusion runs low on persistence fast. In <i>Proceedings of the IEEE International Conference on Computer Vision</i>. Barcelona, Spain: IEEE. <a href=\"https://doi.org/10.1109/ICCV.2011.6126271\">https://doi.org/10.1109/ICCV.2011.6126271</a>","short":"C. Chen, H. Edelsbrunner, in:, Proceedings of the IEEE International Conference on Computer Vision, IEEE, 2011.","chicago":"Chen, Chao, and Herbert Edelsbrunner. “Diffusion Runs Low on Persistence Fast.” In <i>Proceedings of the IEEE International Conference on Computer Vision</i>. IEEE, 2011. <a href=\"https://doi.org/10.1109/ICCV.2011.6126271\">https://doi.org/10.1109/ICCV.2011.6126271</a>.","ista":"Chen C, Edelsbrunner H. 2011. Diffusion runs low on persistence fast. Proceedings of the IEEE International Conference on Computer Vision. ICCV: International Conference on Computer Vision, 6126271.","ieee":"C. Chen and H. Edelsbrunner, “Diffusion runs low on persistence fast,” in <i>Proceedings of the IEEE International Conference on Computer Vision</i>, Barcelona, Spain, 2011.","ama":"Chen C, Edelsbrunner H. Diffusion runs low on persistence fast. In: <i>Proceedings of the IEEE International Conference on Computer Vision</i>. IEEE; 2011. doi:<a href=\"https://doi.org/10.1109/ICCV.2011.6126271\">10.1109/ICCV.2011.6126271</a>"},"author":[{"full_name":"Chen, Chao","id":"3E92416E-F248-11E8-B48F-1D18A9856A87","first_name":"Chao","last_name":"Chen"},{"last_name":"Edelsbrunner","first_name":"Herbert","id":"3FB178DA-F248-11E8-B48F-1D18A9856A87","full_name":"Edelsbrunner, Herbert","orcid":"0000-0002-9823-6833"}],"quality_controlled":"1","year":"2011","publication":"Proceedings of the IEEE International Conference on Computer Vision","title":"Diffusion runs low on persistence fast","_id":"3313","ddc":["000"],"oa":1,"abstract":[{"text":"Interpreting an image as a function on a compact sub- set of the Euclidean plane, we get its scale-space by diffu- sion, spreading the image over the entire plane. This gener- ates a 1-parameter family of functions alternatively defined as convolutions with a progressively wider Gaussian ker- nel. We prove that the corresponding 1-parameter family of persistence diagrams have norms that go rapidly to zero as time goes to infinity. This result rationalizes experimental observations about scale-space. We hope this will lead to targeted improvements of related computer vision methods.","lang":"eng"}],"publication_status":"published","pubrep_id":"540","file_date_updated":"2020-07-14T12:46:07Z","publisher":"IEEE","publist_id":"3327","conference":{"name":"ICCV: International Conference on Computer Vision","end_date":"2011-11-13","location":"Barcelona, Spain","start_date":"2011-11-06"},"month":"11","date_created":"2018-12-11T12:02:37Z","article_number":"6126271","status":"public"},{"title":"A generic algebraic kernel for non linear geometric applications","department":[{"_id":"HeEd"}],"_id":"3328","doi":"10.1145/1998196.1998224","oa":1,"language":[{"iso":"eng"}],"abstract":[{"lang":"eng","text":"We report on a generic uni- and bivariate algebraic kernel that is publicly available with CGAL 3.7. It comprises complete, correct, though efficient state-of-the-art implementations on polynomials, roots of polynomial systems, and the support to analyze algebraic curves defined by bivariate polynomials. The kernel design is generic, that is, various number types and substeps can be exchanged. It is accompanied with a ready-to-use interface to enable arrangements induced by algebraic curves, that have already been used as basis for various geometric applications, as arrangements on Dupin cyclides or the triangulation of algebraic surfaces. We present two novel applications: arrangements of rotated algebraic curves and Boolean set operations on polygons bounded by segments of algebraic curves. We also provide experiments showing that our general implementation is competitive and even often clearly outperforms existing implementations that are explicitly tailored for specific types of non-linear curves that are available in CGAL."}],"publication_status":"published","citation":{"apa":"Berberich, E., Hemmer, M., &#38; Kerber, M. (2011). A generic algebraic kernel for non linear geometric applications (pp. 179–186). Presented at the SCG: Symposium on Computational Geometry, Paris, France: ACM. <a href=\"https://doi.org/10.1145/1998196.1998224\">https://doi.org/10.1145/1998196.1998224</a>","mla":"Berberich, Eric, et al. <i>A Generic Algebraic Kernel for Non Linear Geometric Applications</i>. ACM, 2011, pp. 179–86, doi:<a href=\"https://doi.org/10.1145/1998196.1998224\">10.1145/1998196.1998224</a>.","short":"E. Berberich, M. Hemmer, M. Kerber, in:, ACM, 2011, pp. 179–186.","chicago":"Berberich, Eric, Michael Hemmer, and Michael Kerber. “A Generic Algebraic Kernel for Non Linear Geometric Applications,” 179–86. ACM, 2011. <a href=\"https://doi.org/10.1145/1998196.1998224\">https://doi.org/10.1145/1998196.1998224</a>.","ista":"Berberich E, Hemmer M, Kerber M. 2011. A generic algebraic kernel for non linear geometric applications. SCG: Symposium on Computational Geometry, 179–186.","ieee":"E. Berberich, M. Hemmer, and M. Kerber, “A generic algebraic kernel for non linear geometric applications,” presented at the SCG: Symposium on Computational Geometry, Paris, France, 2011, pp. 179–186.","ama":"Berberich E, Hemmer M, Kerber M. A generic algebraic kernel for non linear geometric applications. In: ACM; 2011:179-186. doi:<a href=\"https://doi.org/10.1145/1998196.1998224\">10.1145/1998196.1998224</a>"},"main_file_link":[{"open_access":"1","url":"https://hal.inria.fr/inria-00480031/file/RR-7274.pdf"}],"article_processing_charge":"No","author":[{"full_name":"Berberich, Eric","last_name":"Berberich","first_name":"Eric"},{"first_name":"Michael","last_name":"Hemmer","full_name":"Hemmer, Michael"},{"first_name":"Michael","last_name":"Kerber","id":"36E4574A-F248-11E8-B48F-1D18A9856A87","full_name":"Kerber, Michael","orcid":"0000-0002-8030-9299"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","quality_controlled":"1","oa_version":"Published Version","type":"conference","date_updated":"2021-01-12T07:42:41Z","year":"2011","day":"13","scopus_import":1,"publist_id":"3307","month":"06","conference":{"start_date":"2011-06-13","location":"Paris, France","end_date":"2011-06-15","name":"SCG: Symposium on Computational Geometry"},"date_created":"2018-12-11T12:02:42Z","status":"public","date_published":"2011-06-13T00:00:00Z","page":"179 - 186","publisher":"ACM"},{"oa_version":"Preprint","date_updated":"2023-02-23T11:12:57Z","type":"conference","year":"2011","day":"13","main_file_link":[{"url":"http://arxiv.org/abs/1109.2158","open_access":"1"}],"citation":{"mla":"Berberich, Eric, et al. “Deconstructing Approximate Offsets.” <i>Proceedings of the Twenty-Seventh Annual Symposium on Computational Geometry</i>, ACM, 2011, pp. 187–96, doi:<a href=\"https://doi.org/10.1145/1998196.1998225\">10.1145/1998196.1998225</a>.","apa":"Berberich, E., Halperin, D., Kerber, M., &#38; Pogalnikova, R. (2011). Deconstructing approximate offsets. In <i>Proceedings of the twenty-seventh annual symposium on Computational geometry</i> (pp. 187–196). Paris, France: ACM. <a href=\"https://doi.org/10.1145/1998196.1998225\">https://doi.org/10.1145/1998196.1998225</a>","ama":"Berberich E, Halperin D, Kerber M, Pogalnikova R. Deconstructing approximate offsets. In: <i>Proceedings of the Twenty-Seventh Annual Symposium on Computational Geometry</i>. ACM; 2011:187-196. doi:<a href=\"https://doi.org/10.1145/1998196.1998225\">10.1145/1998196.1998225</a>","ieee":"E. Berberich, D. Halperin, M. Kerber, and R. Pogalnikova, “Deconstructing approximate offsets,” in <i>Proceedings of the twenty-seventh annual symposium on Computational geometry</i>, Paris, France, 2011, pp. 187–196.","ista":"Berberich E, Halperin D, Kerber M, Pogalnikova R. 2011. Deconstructing approximate offsets. Proceedings of the twenty-seventh annual symposium on Computational geometry. SCG: Symposium on Computational Geometry, 187–196.","chicago":"Berberich, Eric, Dan Halperin, Michael Kerber, and Roza Pogalnikova. “Deconstructing Approximate Offsets.” In <i>Proceedings of the Twenty-Seventh Annual Symposium on Computational Geometry</i>, 187–96. ACM, 2011. <a href=\"https://doi.org/10.1145/1998196.1998225\">https://doi.org/10.1145/1998196.1998225</a>.","short":"E. Berberich, D. Halperin, M. Kerber, R. Pogalnikova, in:, Proceedings of the Twenty-Seventh Annual Symposium on Computational Geometry, ACM, 2011, pp. 187–196."},"author":[{"full_name":"Berberich, Eric","first_name":"Eric","last_name":"Berberich"},{"full_name":"Halperin, Dan","first_name":"Dan","last_name":"Halperin"},{"orcid":"0000-0002-8030-9299","full_name":"Kerber, Michael","id":"36E4574A-F248-11E8-B48F-1D18A9856A87","first_name":"Michael","last_name":"Kerber"},{"full_name":"Pogalnikova, Roza","first_name":"Roza","last_name":"Pogalnikova"}],"quality_controlled":"1","user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","abstract":[{"lang":"eng","text":"We consider the offset-deconstruction problem: Given a polygonal shape Q with n vertices, can it be expressed, up to a tolerance µ in Hausdorff distance, as the Minkowski sum of another polygonal shape P with a disk of fixed radius? If it does, we also seek a preferably simple-looking solution shape P; then, P's offset constitutes an accurate, vertex-reduced, and smoothened approximation of Q. We give an O(n log n)-time exact decision algorithm that handles any polygonal shape, assuming the real-RAM model of computation. An alternative algorithm, based purely on rational arithmetic, answers the same deconstruction problem, up to an uncertainty parameter, and its running time depends on the parameter δ (in addition to the other input parameters: n, δ and the radius of the disk). If the input shape is found to be approximable, the rational-arithmetic algorithm also computes an approximate solution shape for the problem. For convex shapes, the complexity of the exact decision algorithm drops to O(n), which is also the time required to compute a solution shape P with at most one more vertex than a vertex-minimal one. Our study is motivated by applications from two different domains. However, since the offset operation has numerous uses, we anticipate that the reverse question that we study here will be still more broadly applicable. We present results obtained with our implementation of the rational-arithmetic algorithm."}],"publication_status":"published","title":"Deconstructing approximate offsets","publication":"Proceedings of the twenty-seventh annual symposium on Computational geometry","_id":"3329","department":[{"_id":"HeEd"}],"language":[{"iso":"eng"}],"doi":"10.1145/1998196.1998225","related_material":{"record":[{"relation":"later_version","status":"public","id":"3115"}]},"oa":1,"publisher":"ACM","date_published":"2011-06-13T00:00:00Z","page":"187 - 196","month":"06","conference":{"start_date":"2011-06-13","location":"Paris, France","end_date":"2011-06-15","name":"SCG: Symposium on Computational Geometry"},"date_created":"2018-12-11T12:02:42Z","status":"public","scopus_import":1,"publist_id":"3306"},{"publisher":"Springer","page":"209 - 216","external_id":{"arxiv":["1104.1362"]},"date_published":"2011-06-08T00:00:00Z","status":"public","conference":{"end_date":"2011-06-11","name":"ISSAC: International Symposium on Symbolic and Algebraic Computation","location":"California, USA","start_date":"2011-06-08"},"month":"06","arxiv":1,"date_created":"2018-12-11T12:02:43Z","scopus_import":1,"publist_id":"3304","year":"2011","day":"08","oa_version":"Preprint","date_updated":"2021-01-12T07:42:42Z","type":"conference","author":[{"first_name":"Michael","last_name":"Kerber","orcid":"0000-0002-8030-9299","full_name":"Kerber, Michael","id":"36E4574A-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Sagraloff","first_name":"Michael","full_name":"Sagraloff, Michael"}],"article_processing_charge":"No","user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","quality_controlled":"1","citation":{"mla":"Kerber, Michael, and Michael Sagraloff. <i>Root Refinement for Real Polynomials</i>. Springer, 2011, pp. 209–16, doi:<a href=\"https://doi.org/10.1145/1993886.1993920\">10.1145/1993886.1993920</a>.","apa":"Kerber, M., &#38; Sagraloff, M. (2011). Root refinement for real polynomials (pp. 209–216). Presented at the ISSAC: International Symposium on Symbolic and Algebraic Computation, California, USA: Springer. <a href=\"https://doi.org/10.1145/1993886.1993920\">https://doi.org/10.1145/1993886.1993920</a>","ista":"Kerber M, Sagraloff M. 2011. Root refinement for real polynomials. ISSAC: International Symposium on Symbolic and Algebraic Computation, 209–216.","chicago":"Kerber, Michael, and Michael Sagraloff. “Root Refinement for Real Polynomials,” 209–16. Springer, 2011. <a href=\"https://doi.org/10.1145/1993886.1993920\">https://doi.org/10.1145/1993886.1993920</a>.","short":"M. Kerber, M. Sagraloff, in:, Springer, 2011, pp. 209–216.","ieee":"M. Kerber and M. Sagraloff, “Root refinement for real polynomials,” presented at the ISSAC: International Symposium on Symbolic and Algebraic Computation, California, USA, 2011, pp. 209–216.","ama":"Kerber M, Sagraloff M. Root refinement for real polynomials. In: Springer; 2011:209-216. doi:<a href=\"https://doi.org/10.1145/1993886.1993920\">10.1145/1993886.1993920</a>"},"main_file_link":[{"url":"http://arxiv.org/abs/1104.1362","open_access":"1"}],"abstract":[{"text":"We consider the problem of approximating all real roots of a square-free polynomial f. Given isolating intervals, our algorithm refines each of them to a width at most 2-L, that is, each of the roots is approximated to L bits after the binary point. Our method provides a certified answer for arbitrary real polynomials, only requiring finite approximations of the polynomial coefficient and choosing a suitable working precision adaptively. In this way, we get a correct algorithm that is simple to implement and practically efficient. Our algorithm uses the quadratic interval refinement method; we adapt that method to be able to cope with inaccuracies when evaluating f, without sacrificing its quadratic convergence behavior. We prove a bound on the bit complexity of our algorithm in terms of degree, coefficient size and discriminant. Our bound improves previous work on integer polynomials by a factor of deg f and essentially matches best known theoretical bounds on root approximation which are obtained by very sophisticated algorithms.","lang":"eng"}],"publication_status":"published","_id":"3330","department":[{"_id":"HeEd"}],"oa":1,"doi":"10.1145/1993886.1993920","language":[{"iso":"eng"}],"title":"Root refinement for real polynomials"},{"intvolume":"        27","publist_id":"3301","month":"03","date_created":"2018-12-11T12:02:43Z","status":"public","issue":"3","volume":27,"file_date_updated":"2020-07-14T12:46:08Z","article_type":"original","publisher":"Springer","publication":"Graphs and Combinatorics","title":"A note on the complexity of real algebraic hypersurfaces","_id":"3332","ddc":["500"],"oa":1,"abstract":[{"text":"Given an algebraic hypersurface O in ℝd, how many simplices are necessary for a simplicial complex isotopic to O? We address this problem and the variant where all vertices of the complex must lie on O. We give asymptotically tight worst-case bounds for algebraic plane curves. Our results gradually improve known bounds in higher dimensions; however, the question for tight bounds remains unsolved for d ≥ 3.","lang":"eng"}],"publication_status":"published","citation":{"mla":"Kerber, Michael, and Michael Sagraloff. “A Note on the Complexity of Real Algebraic Hypersurfaces.” <i>Graphs and Combinatorics</i>, vol. 27, no. 3, Springer, 2011, pp. 419–30, doi:<a href=\"https://doi.org/10.1007/s00373-011-1020-7\">10.1007/s00373-011-1020-7</a>.","apa":"Kerber, M., &#38; Sagraloff, M. (2011). A note on the complexity of real algebraic hypersurfaces. <i>Graphs and Combinatorics</i>. Springer. <a href=\"https://doi.org/10.1007/s00373-011-1020-7\">https://doi.org/10.1007/s00373-011-1020-7</a>","ieee":"M. Kerber and M. Sagraloff, “A note on the complexity of real algebraic hypersurfaces,” <i>Graphs and Combinatorics</i>, vol. 27, no. 3. Springer, pp. 419–430, 2011.","ama":"Kerber M, Sagraloff M. A note on the complexity of real algebraic hypersurfaces. <i>Graphs and Combinatorics</i>. 2011;27(3):419-430. doi:<a href=\"https://doi.org/10.1007/s00373-011-1020-7\">10.1007/s00373-011-1020-7</a>","short":"M. Kerber, M. Sagraloff, Graphs and Combinatorics 27 (2011) 419–430.","chicago":"Kerber, Michael, and Michael Sagraloff. “A Note on the Complexity of Real Algebraic Hypersurfaces.” <i>Graphs and Combinatorics</i>. Springer, 2011. <a href=\"https://doi.org/10.1007/s00373-011-1020-7\">https://doi.org/10.1007/s00373-011-1020-7</a>.","ista":"Kerber M, Sagraloff M. 2011. A note on the complexity of real algebraic hypersurfaces. Graphs and Combinatorics. 27(3), 419–430."},"quality_controlled":"1","author":[{"id":"36E4574A-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-8030-9299","full_name":"Kerber, Michael","first_name":"Michael","last_name":"Kerber"},{"full_name":"Sagraloff, Michael","first_name":"Michael","last_name":"Sagraloff"}],"year":"2011","scopus_import":1,"file":[{"file_size":143976,"creator":"dernst","content_type":"application/pdf","date_created":"2020-05-19T16:11:36Z","relation":"main_file","access_level":"open_access","file_name":"2011_GraphsCombi_Kerber.pdf","checksum":"a63a1e3e885dcc68f1e3dea68dfbe213","file_id":"7869","date_updated":"2020-07-14T12:46:08Z"}],"date_published":"2011-03-17T00:00:00Z","page":"419 - 430","has_accepted_license":"1","department":[{"_id":"HeEd"}],"language":[{"iso":"eng"}],"doi":"10.1007/s00373-011-1020-7","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","article_processing_charge":"No","oa_version":"Submitted Version","type":"journal_article","date_updated":"2021-01-12T07:42:43Z","day":"17"},{"article_type":"letter_note","publisher":"Springer","volume":45,"issue":"1","page":"1 - 2","date_published":"2011-01-01T00:00:00Z","status":"public","date_created":"2018-12-11T12:02:44Z","month":"01","publist_id":"3297","scopus_import":1,"intvolume":"        45","day":"01","year":"2011","type":"journal_article","date_updated":"2021-01-12T07:42:44Z","oa_version":"None","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","quality_controlled":"1","author":[{"first_name":"Herbert","last_name":"Edelsbrunner","orcid":"0000-0002-9823-6833","full_name":"Edelsbrunner, Herbert","id":"3FB178DA-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Pach, János","first_name":"János","last_name":"Pach"},{"full_name":"Ziegler, Günter","first_name":"Günter","last_name":"Ziegler"}],"citation":{"ista":"Edelsbrunner H, Pach J, Ziegler G. 2011. Letter from the new editors-in-chief. Discrete &#38; Computational Geometry. 45(1), 1–2.","chicago":"Edelsbrunner, Herbert, János Pach, and Günter Ziegler. “Letter from the New Editors-in-Chief.” <i>Discrete &#38; Computational Geometry</i>. Springer, 2011. <a href=\"https://doi.org/10.1007/s00454-010-9313-9\">https://doi.org/10.1007/s00454-010-9313-9</a>.","short":"H. Edelsbrunner, J. Pach, G. Ziegler, Discrete &#38; Computational Geometry 45 (2011) 1–2.","ieee":"H. Edelsbrunner, J. Pach, and G. Ziegler, “Letter from the new editors-in-chief,” <i>Discrete &#38; Computational Geometry</i>, vol. 45, no. 1. Springer, pp. 1–2, 2011.","ama":"Edelsbrunner H, Pach J, Ziegler G. Letter from the new editors-in-chief. <i>Discrete &#38; Computational Geometry</i>. 2011;45(1):1-2. doi:<a href=\"https://doi.org/10.1007/s00454-010-9313-9\">10.1007/s00454-010-9313-9</a>","mla":"Edelsbrunner, Herbert, et al. “Letter from the New Editors-in-Chief.” <i>Discrete &#38; Computational Geometry</i>, vol. 45, no. 1, Springer, 2011, pp. 1–2, doi:<a href=\"https://doi.org/10.1007/s00454-010-9313-9\">10.1007/s00454-010-9313-9</a>.","apa":"Edelsbrunner, H., Pach, J., &#38; Ziegler, G. (2011). Letter from the new editors-in-chief. <i>Discrete &#38; Computational Geometry</i>. Springer. <a href=\"https://doi.org/10.1007/s00454-010-9313-9\">https://doi.org/10.1007/s00454-010-9313-9</a>"},"publication_status":"published","doi":"10.1007/s00454-010-9313-9","language":[{"iso":"eng"}],"_id":"3334","department":[{"_id":"HeEd"}],"publication":"Discrete & Computational Geometry","title":"Letter from the new editors-in-chief"}]