[{"type":"journal_article","status":"public","oa_version":"Published Version","day":"08","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","file":[{"date_updated":"2023-05-16T08:28:37Z","date_created":"2023-05-16T08:28:37Z","file_name":"Zhenyuan2023.pdf","checksum":"4c188c2be4745467a8790bbf5d6491aa","file_id":"12974","success":1,"relation":"main_file","access_level":"open_access","content_type":"application/pdf","file_size":24003702,"creator":"mpiovarc"}],"conference":{"name":"EG: Eurographics","start_date":"2023-05-08","location":"Saarbrucken, Germany","end_date":"2023-05-12"},"publication_identifier":{"issn":["1467-8659"]},"month":"05","author":[{"full_name":"Liu, Zhenyuan","first_name":"Zhenyuan","orcid":"0000-0001-9200-5690","last_name":"Liu","id":"70f0d7cf-ae65-11ec-a14f-89dfc5505b19"},{"last_name":"Piovarci","id":"62E473F4-5C99-11EA-A40E-AF823DDC885E","first_name":"Michael","full_name":"Piovarci, Michael"},{"id":"400429CC-F248-11E8-B48F-1D18A9856A87","last_name":"Hafner","first_name":"Christian","full_name":"Hafner, Christian"},{"last_name":"Charrondiere","id":"a3a24133-2cc7-11ec-be88-8ddaf6f464b1","first_name":"Raphael","full_name":"Charrondiere, Raphael"},{"orcid":"0000-0001-6511-9385","id":"49876194-F248-11E8-B48F-1D18A9856A87","last_name":"Bickel","first_name":"Bernd","full_name":"Bickel, Bernd"}],"publication":"Computer Graphics Forum","language":[{"iso":"eng"}],"intvolume":"        42","has_accepted_license":"1","isi":1,"title":"Directionality-aware design of embroidery patterns","oa":1,"date_updated":"2023-08-01T14:47:05Z","article_processing_charge":"No","issue":"2","page":"397-409","department":[{"_id":"BeBi"}],"quality_controlled":"1","volume":42,"publisher":"Wiley","date_published":"2023-05-08T00:00:00Z","license":"https://creativecommons.org/licenses/by-nc-nd/4.0/","project":[{"name":"Perception-Aware Appearance Fabrication","_id":"eb901961-77a9-11ec-83b8-f5c883a62027","grant_number":"M03319"},{"name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","call_identifier":"H2020","grant_number":"715767","_id":"24F9549A-B435-11E9-9278-68D0E5697425"}],"external_id":{"isi":["001000062600033"]},"abstract":[{"text":"Embroidery is a long-standing and high-quality approach to making logos and images on textiles. Nowadays, it can also be performed via automated machines that weave threads with high spatial accuracy. A characteristic feature of the appearance of the threads is a high degree of anisotropy. The anisotropic behavior is caused by depositing thin but long strings of thread. As a result, the stitched patterns convey both color and direction. Artists leverage this anisotropic behavior to enhance pure color images with textures, illusions of motion, or depth cues. However, designing colorful embroidery patterns with prescribed directionality is a challenging task, one usually requiring an expert designer. In this work, we propose an interactive algorithm that generates machine-fabricable embroidery patterns from multi-chromatic images equipped with user-specified directionality fields.We cast the problem of finding a stitching pattern into vector theory. To find a suitable stitching pattern, we extract sources and sinks from the divergence field of the vector field extracted from the input and use them to trace streamlines. We further optimize the streamlines to guarantee a smooth and connected stitching pattern. The generated patterns approximate the color distribution constrained by the directionality field. To allow for further artistic control, the trade-off between color match and directionality match can be interactively explored via an intuitive slider. We showcase our approach by fabricating several embroidery paths.","lang":"eng"}],"ddc":["004"],"tmp":{"legal_code_url":"https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode","image":"/images/cc_by_nc_nd.png","short":"CC BY-NC-ND (4.0)","name":"Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)"},"publication_status":"published","doi":"10.1111/cgf.14770 ","file_date_updated":"2023-05-16T08:28:37Z","_id":"12972","article_type":"original","ec_funded":1,"citation":{"apa":"Liu, Z., Piovarci, M., Hafner, C., Charrondiere, R., &#38; Bickel, B. (2023). Directionality-aware design of embroidery patterns. <i>Computer Graphics Forum</i>. Saarbrucken, Germany: Wiley. <a href=\"https://doi.org/10.1111/cgf.14770 \">https://doi.org/10.1111/cgf.14770 </a>","mla":"Liu, Zhenyuan, et al. “Directionality-Aware Design of Embroidery Patterns.” <i>Computer Graphics Forum</i>, vol. 42, no. 2, Wiley, 2023, pp. 397–409, doi:<a href=\"https://doi.org/10.1111/cgf.14770 \">10.1111/cgf.14770 </a>.","chicago":"Liu, Zhenyuan, Michael Piovarci, Christian Hafner, Raphael Charrondiere, and Bernd Bickel. “Directionality-Aware Design of Embroidery Patterns.” <i>Computer Graphics Forum</i>. Wiley, 2023. <a href=\"https://doi.org/10.1111/cgf.14770 \">https://doi.org/10.1111/cgf.14770 </a>.","ista":"Liu Z, Piovarci M, Hafner C, Charrondiere R, Bickel B. 2023. Directionality-aware design of embroidery patterns. Computer Graphics Forum. 42(2), 397–409.","ieee":"Z. Liu, M. Piovarci, C. Hafner, R. Charrondiere, and B. Bickel, “Directionality-aware design of embroidery patterns,” <i>Computer Graphics Forum</i>, vol. 42, no. 2. Wiley, pp. 397–409, 2023.","ama":"Liu Z, Piovarci M, Hafner C, Charrondiere R, Bickel B. Directionality-aware design of embroidery patterns. <i>Computer Graphics Forum</i>. 2023;42(2):397-409. doi:<a href=\"https://doi.org/10.1111/cgf.14770 \">10.1111/cgf.14770 </a>","short":"Z. Liu, M. Piovarci, C. Hafner, R. Charrondiere, B. Bickel, Computer Graphics Forum 42 (2023) 397–409."},"date_created":"2023-05-16T08:47:25Z","keyword":["embroidery","design","directionality","density","image"],"acknowledgement":"This work was supported by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (grant agreement No 715767 – MATERIALIZABLE), and FWF Lise Meitner (Grant M 3319). We thank the anonymous reviewers for their insightful feedback; Solal Pirelli, Shardul Chiplunkar, and Paola Mejia for proofreading; everyone in the visual computing group at ISTA for inspiring lunch and coffee breaks; Thibault Tricard for help producing the results of Phasor Noise.","year":"2023"},{"publication":"2023 IEEE International Conference on Robotics and Automation","language":[{"iso":"eng"}],"isi":1,"intvolume":"      2023","scopus_import":"1","has_accepted_license":"1","date_updated":"2023-12-13T11:20:00Z","oa":1,"article_processing_charge":"No","title":"Learning deposition policies for fused multi-material 3D printing","status":"public","type":"conference","conference":{"start_date":"2023-05-29","name":"ICRA: International Conference on Robotics and Automation","end_date":"2023-06-02","location":"London, United Kingdom"},"publication_identifier":{"issn":["1050-4729"],"eisbn":["9798350323658"]},"month":"07","day":"04","oa_version":"Submitted Version","file":[{"file_name":"Liao2023.pdf","checksum":"daeaa67124777d88487f933ea3f77164","file_id":"12977","success":1,"date_updated":"2023-05-16T09:12:05Z","date_created":"2023-05-16T09:12:05Z","creator":"mpiovarc","file_size":5367986,"access_level":"open_access","content_type":"application/pdf","relation":"main_file"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","author":[{"last_name":"Liao","first_name":"Kang","full_name":"Liao, Kang"},{"last_name":"Tricard","first_name":"Thibault","full_name":"Tricard, Thibault"},{"id":"62E473F4-5C99-11EA-A40E-AF823DDC885E","last_name":"Piovarci","orcid":"0000-0002-5062-4474","first_name":"Michael","full_name":"Piovarci, Michael"},{"last_name":"Seidel","first_name":"Hans-Peter","full_name":"Seidel, Hans-Peter"},{"first_name":"Vahid","full_name":"Babaei, Vahid","last_name":"Babaei"}],"doi":"10.1109/ICRA48891.2023.10160465","file_date_updated":"2023-05-16T09:12:05Z","_id":"12976","acknowledgement":"This work is graciously supported by FWF Lise Meitner (Grant M 3319). Kang Liao sincerely thank Emiliano Luci, Chunyu Lin, and Yao Zhao for their huge support.","year":"2023","date_created":"2023-05-16T09:14:09Z","citation":{"apa":"Liao, K., Tricard, T., Piovarci, M., Seidel, H.-P., &#38; Babaei, V. (2023). Learning deposition policies for fused multi-material 3D printing. In <i>2023 IEEE International Conference on Robotics and Automation</i> (Vol. 2023, pp. 12345–12352). London, United Kingdom: IEEE. <a href=\"https://doi.org/10.1109/ICRA48891.2023.10160465\">https://doi.org/10.1109/ICRA48891.2023.10160465</a>","mla":"Liao, Kang, et al. “Learning Deposition Policies for Fused Multi-Material 3D Printing.” <i>2023 IEEE International Conference on Robotics and Automation</i>, vol. 2023, IEEE, 2023, pp. 12345–52, doi:<a href=\"https://doi.org/10.1109/ICRA48891.2023.10160465\">10.1109/ICRA48891.2023.10160465</a>.","chicago":"Liao, Kang, Thibault Tricard, Michael Piovarci, Hans-Peter Seidel, and Vahid Babaei. “Learning Deposition Policies for Fused Multi-Material 3D Printing.” In <i>2023 IEEE International Conference on Robotics and Automation</i>, 2023:12345–52. IEEE, 2023. <a href=\"https://doi.org/10.1109/ICRA48891.2023.10160465\">https://doi.org/10.1109/ICRA48891.2023.10160465</a>.","ista":"Liao K, Tricard T, Piovarci M, Seidel H-P, Babaei V. 2023. Learning deposition policies for fused multi-material 3D printing. 2023 IEEE International Conference on Robotics and Automation. ICRA: International Conference on Robotics and Automation vol. 2023, 12345–12352.","ieee":"K. Liao, T. Tricard, M. Piovarci, H.-P. Seidel, and V. Babaei, “Learning deposition policies for fused multi-material 3D printing,” in <i>2023 IEEE International Conference on Robotics and Automation</i>, London, United Kingdom, 2023, vol. 2023, pp. 12345–12352.","ama":"Liao K, Tricard T, Piovarci M, Seidel H-P, Babaei V. Learning deposition policies for fused multi-material 3D printing. In: <i>2023 IEEE International Conference on Robotics and Automation</i>. Vol 2023. IEEE; 2023:12345-12352. doi:<a href=\"https://doi.org/10.1109/ICRA48891.2023.10160465\">10.1109/ICRA48891.2023.10160465</a>","short":"K. Liao, T. Tricard, M. Piovarci, H.-P. Seidel, V. Babaei, in:, 2023 IEEE International Conference on Robotics and Automation, IEEE, 2023, pp. 12345–12352."},"keyword":["reinforcement learning","deposition","control","color","multi-filament"],"publisher":"IEEE","date_published":"2023-07-04T00:00:00Z","page":"12345-12352","department":[{"_id":"BeBi"}],"quality_controlled":"1","volume":2023,"project":[{"_id":"eb901961-77a9-11ec-83b8-f5c883a62027","grant_number":"M03319","name":"Perception-Aware Appearance Fabrication"}],"ddc":["004"],"external_id":{"isi":["001048371104068"]},"abstract":[{"text":"3D printing based on continuous deposition of materials, such as filament-based 3D printing, has seen widespread adoption thanks to its versatility in working with a wide range of materials. An important shortcoming of this type of technology is its limited multi-material capabilities. While there are simple hardware designs that enable multi-material printing in principle, the required software is heavily underdeveloped. A typical hardware design fuses together individual materials fed into a single chamber from multiple inlets before they are deposited. This design, however, introduces a time delay between the intended material mixture and its actual deposition. In this work, inspired by diverse path planning research in robotics, we show that this mechanical challenge can be addressed via improved printer control. We propose to formulate the search for optimal multi-material printing policies in a reinforcement\r\nlearning setup. We put forward a simple numerical deposition model that takes into account the non-linear material mixing and delayed material deposition. To validate our system we focus on color fabrication, a problem known for its strict requirements for varying material mixtures at a high spatial frequency. We demonstrate that our learned control policy outperforms state-of-the-art hand-crafted algorithms.","lang":"eng"}],"publication_status":"published"},{"status":"public","type":"conference","day":"23","oa_version":"Published Version","file":[{"relation":"main_file","file_size":42323971,"content_type":"application/pdf","access_level":"open_access","creator":"mpiovarc","date_created":"2023-05-16T09:32:50Z","date_updated":"2023-05-16T09:32:50Z","success":1,"file_id":"12983","checksum":"84a437739af5d46507928939b20c0c28","file_name":"Condor2023_supplemental.pdf"},{"file_size":26079404,"relation":"main_file","content_type":"application/pdf","access_level":"open_access","creator":"dernst","date_updated":"2024-01-29T10:14:10Z","date_created":"2024-01-29T10:14:10Z","file_name":"2023_Siggraph_Condor.pdf","file_id":"14893","checksum":"0f5c8b242e8e7c153c04888c4d0c6f37","success":1}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","conference":{"name":"SIGGRAPH: Computer Graphics and Interactive Techniques Conference","start_date":"2023-08-06","location":"Los Angeles, CA, United States","end_date":"2023-08-10"},"publication_identifier":{"isbn":["9798400701597"]},"month":"07","author":[{"last_name":"Condor","full_name":"Condor, Jorge","first_name":"Jorge"},{"orcid":"0000-0002-5062-4474","id":"62E473F4-5C99-11EA-A40E-AF823DDC885E","last_name":"Piovarci","full_name":"Piovarci, Michael","first_name":"Michael"},{"first_name":"Bernd","full_name":"Bickel, Bernd","id":"49876194-F248-11E8-B48F-1D18A9856A87","last_name":"Bickel","orcid":"0000-0001-6511-9385"},{"last_name":"Didyk","full_name":"Didyk, Piotr","first_name":"Piotr"}],"publication":"SIGGRAPH ’23 Conference Proceedings","language":[{"iso":"eng"}],"has_accepted_license":"1","isi":1,"title":"Gloss-aware color correction for 3D printing","oa":1,"date_updated":"2024-02-28T12:52:04Z","article_processing_charge":"No","department":[{"_id":"BeBi"}],"quality_controlled":"1","publisher":"Association for Computing Machinery","license":"https://creativecommons.org/licenses/by/4.0/","date_published":"2023-07-23T00:00:00Z","project":[{"grant_number":"M03319","_id":"eb901961-77a9-11ec-83b8-f5c883a62027","name":"Perception-Aware Appearance Fabrication"}],"external_id":{"isi":["001117690500021"]},"abstract":[{"lang":"eng","text":"Color and gloss are fundamental aspects of surface appearance. State-of-the-art fabrication techniques can manipulate both properties of the printed 3D objects. However, in the context of appearance reproduction, perceptual aspects of color and gloss are usually handled separately, even though previous perceptual studies suggest their interaction. Our work is motivated by previous studies demonstrating a perceived color shift due to a change in the object's gloss, i.e., two samples with the same color but different surface gloss appear as they have different colors. In this paper, we conduct new experiments which support this observation and provide insights into the magnitude and direction of the perceived color change. We use the observations as guidance to design a new method that estimates and corrects the color shift enabling the fabrication of objects with the same perceived color but different surface gloss. We formulate the problem as an optimization procedure solved using differentiable rendering. We evaluate the effectiveness of our method in perceptual experiments with 3D objects fabricated using a multi-material 3D printer and demonstrate potential applications. "}],"ddc":["004"],"tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)","image":"/images/cc_by.png","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"publication_status":"published","doi":"10.1145/3588432.3591546","file_date_updated":"2024-01-29T10:14:10Z","_id":"12979","article_number":"21","citation":{"apa":"Condor, J., Piovarci, M., Bickel, B., &#38; Didyk, P. (2023). Gloss-aware color correction for 3D printing. In <i>SIGGRAPH ’23 Conference Proceedings</i>. Los Angeles, CA, United States: Association for Computing Machinery. <a href=\"https://doi.org/10.1145/3588432.3591546\">https://doi.org/10.1145/3588432.3591546</a>","mla":"Condor, Jorge, et al. “Gloss-Aware Color Correction for 3D Printing.” <i>SIGGRAPH ’23 Conference Proceedings</i>, 21, Association for Computing Machinery, 2023, doi:<a href=\"https://doi.org/10.1145/3588432.3591546\">10.1145/3588432.3591546</a>.","ista":"Condor J, Piovarci M, Bickel B, Didyk P. 2023. Gloss-aware color correction for 3D printing. SIGGRAPH ’23 Conference Proceedings. SIGGRAPH: Computer Graphics and Interactive Techniques Conference, 21.","chicago":"Condor, Jorge, Michael Piovarci, Bernd Bickel, and Piotr Didyk. “Gloss-Aware Color Correction for 3D Printing.” In <i>SIGGRAPH ’23 Conference Proceedings</i>. Association for Computing Machinery, 2023. <a href=\"https://doi.org/10.1145/3588432.3591546\">https://doi.org/10.1145/3588432.3591546</a>.","short":"J. Condor, M. Piovarci, B. Bickel, P. Didyk, in:, SIGGRAPH ’23 Conference Proceedings, Association for Computing Machinery, 2023.","ama":"Condor J, Piovarci M, Bickel B, Didyk P. Gloss-aware color correction for 3D printing. In: <i>SIGGRAPH ’23 Conference Proceedings</i>. Association for Computing Machinery; 2023. doi:<a href=\"https://doi.org/10.1145/3588432.3591546\">10.1145/3588432.3591546</a>","ieee":"J. Condor, M. Piovarci, B. Bickel, and P. Didyk, “Gloss-aware color correction for 3D printing,” in <i>SIGGRAPH ’23 Conference Proceedings</i>, Los Angeles, CA, United States, 2023."},"date_created":"2023-05-16T09:34:13Z","keyword":["color","gloss","perception","color compensation","color management"],"acknowledgement":"We thank Matthew S Zurawski for the 3D model of the car speed shape. This research has been supported by the Swiss National Science Foundation (SNSF, Grant 200502) and the FWF Lise Meitner (Grant M 3319).","year":"2023"},{"oa":1,"date_updated":"2024-01-29T10:27:23Z","issue":"4","article_processing_charge":"No","title":"Skin-Screen: A computational fabrication framework for color tattoos","isi":1,"intvolume":"        42","has_accepted_license":"1","language":[{"iso":"eng"}],"publication":"Transactions on Graphics","author":[{"id":"62E473F4-5C99-11EA-A40E-AF823DDC885E","last_name":"Piovarci","orcid":"0000-0002-5062-4474","first_name":"Michael","full_name":"Piovarci, Michael"},{"last_name":"Chapiro","first_name":"Alexandre","full_name":"Chapiro, Alexandre"},{"id":"49876194-F248-11E8-B48F-1D18A9856A87","last_name":"Bickel","orcid":"0000-0001-6511-9385","full_name":"Bickel, Bernd","first_name":"Bernd"}],"conference":{"end_date":"2023-08-10","location":"Los Angeles, CA, United States","start_date":"2023-08-06","name":"SIGGRAPH: Computer Graphics and Interactive Techniques Conference"},"month":"07","publication_identifier":{"eissn":["1557-7368"],"issn":["0730-0301"]},"oa_version":"Submitted Version","day":"26","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","file":[{"date_updated":"2023-05-16T09:38:25Z","date_created":"2023-05-16T09:38:25Z","checksum":"5f0a6867689e025a661bd0b4fd90b821","file_id":"12985","file_name":"Piovarci2023.pdf","success":1,"relation":"main_file","content_type":"application/pdf","access_level":"open_access","file_size":30817343,"creator":"mpiovarc"}],"status":"public","type":"journal_article","acknowledgement":"We thank Todor Asenov and the Miba Machine Shop for their help in assembling the tattoo machine and manufacturing the substrates. We thank Geysler Rodrigues for the insightful discussions on tattooing practices from a professional artist's perspective. We thank Maria Fernanda Portugal for sharing a doctor's perspective on medical applications of tattoos. This work is graciously supported by the FWF Lise Meitner (Grant M 3319).","year":"2023","citation":{"ista":"Piovarci M, Chapiro A, Bickel B. 2023. Skin-Screen: A computational fabrication framework for color tattoos. Transactions on Graphics. 42(4), 67.","chicago":"Piovarci, Michael, Alexandre Chapiro, and Bernd Bickel. “Skin-Screen: A Computational Fabrication Framework for Color Tattoos.” <i>Transactions on Graphics</i>. Association for Computing Machinery, 2023. <a href=\"https://doi.org/10.1145/3592432\">https://doi.org/10.1145/3592432</a>.","mla":"Piovarci, Michael, et al. “Skin-Screen: A Computational Fabrication Framework for Color Tattoos.” <i>Transactions on Graphics</i>, vol. 42, no. 4, 67, Association for Computing Machinery, 2023, doi:<a href=\"https://doi.org/10.1145/3592432\">10.1145/3592432</a>.","ama":"Piovarci M, Chapiro A, Bickel B. Skin-Screen: A computational fabrication framework for color tattoos. <i>Transactions on Graphics</i>. 2023;42(4). doi:<a href=\"https://doi.org/10.1145/3592432\">10.1145/3592432</a>","ieee":"M. Piovarci, A. Chapiro, and B. Bickel, “Skin-Screen: A computational fabrication framework for color tattoos,” <i>Transactions on Graphics</i>, vol. 42, no. 4. Association for Computing Machinery, 2023.","short":"M. Piovarci, A. Chapiro, B. Bickel, Transactions on Graphics 42 (2023).","apa":"Piovarci, M., Chapiro, A., &#38; Bickel, B. (2023). Skin-Screen: A computational fabrication framework for color tattoos. <i>Transactions on Graphics</i>. Los Angeles, CA, United States: Association for Computing Machinery. <a href=\"https://doi.org/10.1145/3592432\">https://doi.org/10.1145/3592432</a>"},"date_created":"2023-05-16T09:39:14Z","keyword":["appearance","modeling","reproduction","tattoo","skin color","gamut mapping","ink-optimization","prosthetic"],"article_number":"67","file_date_updated":"2023-05-16T09:38:25Z","article_type":"original","_id":"12984","acknowledged_ssus":[{"_id":"M-Shop"}],"doi":"10.1145/3592432","publication_status":"published","ddc":["004"],"external_id":{"isi":["001044671300033"]},"abstract":[{"lang":"eng","text":"Tattoos are a highly popular medium, with both artistic and medical applications. Although the mechanical process of tattoo application has evolved historically, the results are reliant on the artisanal skill of the artist. This can be especially challenging for some skin tones, or in cases where artists lack experience. We provide the first systematic overview of tattooing as a computational fabrication technique. We built an automated tattooing rig and a recipe for the creation of silicone sheets mimicking realistic skin tones, which allowed us to create an accurate model predicting tattoo appearance. This enables several exciting applications including tattoo previewing, color retargeting, novel ink spectra optimization, color-accurate prosthetics, and more."}],"project":[{"_id":"eb901961-77a9-11ec-83b8-f5c883a62027","grant_number":"M03319","name":"Perception-Aware Appearance Fabrication"}],"publisher":"Association for Computing Machinery","date_published":"2023-07-26T00:00:00Z","department":[{"_id":"BeBi"}],"quality_controlled":"1","volume":42},{"type":"conference","status":"public","oa_version":"Published Version","day":"10","file":[{"creator":"dernst","relation":"main_file","access_level":"open_access","file_size":95967451,"content_type":"application/pdf","success":1,"file_id":"14823","checksum":"8abe27432ed222b50d1af9b3388db1b0","file_name":"2023_SA_Chen.pdf","date_created":"2024-01-17T08:33:06Z","date_updated":"2024-01-17T08:33:06Z"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","conference":{"location":"Sydney, Australia","end_date":"2023-12-15","name":"SIGGRAPH: Computer Graphics and Interactive Techniques Conference","start_date":"2023-12-12"},"month":"12","publication_identifier":{"isbn":["9798400703157"]},"author":[{"last_name":"Chen","full_name":"Chen, Bin","first_name":"Bin"},{"last_name":"Jindal","full_name":"Jindal, Akshay","first_name":"Akshay"},{"first_name":"Michael","full_name":"Piovarci, Michael","orcid":"0000-0002-5062-4474","id":"62E473F4-5C99-11EA-A40E-AF823DDC885E","last_name":"Piovarci"},{"first_name":"Chao","full_name":"Wang, Chao","last_name":"Wang"},{"full_name":"Seidel, Hans Peter","first_name":"Hans Peter","last_name":"Seidel"},{"first_name":"Piotr","full_name":"Didyk, Piotr","last_name":"Didyk"},{"full_name":"Myszkowski, Karol","first_name":"Karol","last_name":"Myszkowski"},{"first_name":"Ana","full_name":"Serrano, Ana","last_name":"Serrano"},{"last_name":"Mantiuk","full_name":"Mantiuk, Rafał K.","first_name":"Rafał K."}],"publication":"Proceedings of the SIGGRAPH Asia 2023 Conference","language":[{"iso":"eng"}],"has_accepted_license":"1","scopus_import":"1","title":"The effect of display capabilities on the gloss consistency between real and virtual objects","date_updated":"2024-01-17T08:38:35Z","oa":1,"article_processing_charge":"Yes (in subscription journal)","department":[{"_id":"BeBi"}],"quality_controlled":"1","publisher":"Association for Computing Machinery","date_published":"2023-12-10T00:00:00Z","project":[{"name":"Perception-Aware Appearance Fabrication","grant_number":"M03319","_id":"eb901961-77a9-11ec-83b8-f5c883a62027"}],"abstract":[{"lang":"eng","text":"A faithful reproduction of gloss is inherently difficult because of the limited dynamic range, peak luminance, and 3D capabilities of display devices. This work investigates how the display capabilities affect gloss appearance with respect to a real-world reference object. To this end, we employ an accurate imaging pipeline to achieve a perceptual gloss match between a virtual and real object presented side-by-side on an augmented-reality high-dynamic-range (HDR) stereoscopic display, which has not been previously attained to this extent. Based on this precise gloss reproduction, we conduct a series of gloss matching experiments to study how gloss perception degrades based on individual factors: object albedo, display luminance, dynamic range, stereopsis, and tone mapping. We support the study with a detailed analysis of individual factors, followed by an in-depth discussion on the observed perceptual effects. Our experiments demonstrate that stereoscopic presentation has a limited effect on the gloss matching task on our HDR display. However, both reduced luminance and dynamic range of the display reduce the perceived gloss. This means that the visual system cannot compensate for the changes in gloss appearance across luminance (lack of gloss constancy), and the tone mapping operator should be carefully selected when reproducing gloss on a low dynamic range (LDR) display."}],"ddc":["000"],"tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)","image":"/images/cc_by.png","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"publication_status":"published","doi":"10.1145/3610548.3618226","file_date_updated":"2024-01-17T08:33:06Z","_id":"14798","article_number":"90","citation":{"apa":"Chen, B., Jindal, A., Piovarci, M., Wang, C., Seidel, H. P., Didyk, P., … Mantiuk, R. K. (2023). The effect of display capabilities on the gloss consistency between real and virtual objects. In <i>Proceedings of the SIGGRAPH Asia 2023 Conference</i>. Sydney, Australia: Association for Computing Machinery. <a href=\"https://doi.org/10.1145/3610548.3618226\">https://doi.org/10.1145/3610548.3618226</a>","ieee":"B. Chen <i>et al.</i>, “The effect of display capabilities on the gloss consistency between real and virtual objects,” in <i>Proceedings of the SIGGRAPH Asia 2023 Conference</i>, Sydney, Australia, 2023.","ama":"Chen B, Jindal A, Piovarci M, et al. The effect of display capabilities on the gloss consistency between real and virtual objects. In: <i>Proceedings of the SIGGRAPH Asia 2023 Conference</i>. Association for Computing Machinery; 2023. doi:<a href=\"https://doi.org/10.1145/3610548.3618226\">10.1145/3610548.3618226</a>","short":"B. Chen, A. Jindal, M. Piovarci, C. Wang, H.P. Seidel, P. Didyk, K. Myszkowski, A. Serrano, R.K. Mantiuk, in:, Proceedings of the SIGGRAPH Asia 2023 Conference, Association for Computing Machinery, 2023.","ista":"Chen B, Jindal A, Piovarci M, Wang C, Seidel HP, Didyk P, Myszkowski K, Serrano A, Mantiuk RK. 2023. The effect of display capabilities on the gloss consistency between real and virtual objects. Proceedings of the SIGGRAPH Asia 2023 Conference. SIGGRAPH: Computer Graphics and Interactive Techniques Conference, 90.","chicago":"Chen, Bin, Akshay Jindal, Michael Piovarci, Chao Wang, Hans Peter Seidel, Piotr Didyk, Karol Myszkowski, Ana Serrano, and Rafał K. Mantiuk. “The Effect of Display Capabilities on the Gloss Consistency between Real and Virtual Objects.” In <i>Proceedings of the SIGGRAPH Asia 2023 Conference</i>. Association for Computing Machinery, 2023. <a href=\"https://doi.org/10.1145/3610548.3618226\">https://doi.org/10.1145/3610548.3618226</a>.","mla":"Chen, Bin, et al. “The Effect of Display Capabilities on the Gloss Consistency between Real and Virtual Objects.” <i>Proceedings of the SIGGRAPH Asia 2023 Conference</i>, 90, Association for Computing Machinery, 2023, doi:<a href=\"https://doi.org/10.1145/3610548.3618226\">10.1145/3610548.3618226</a>."},"date_created":"2024-01-14T23:00:57Z","acknowledgement":"This work is supported by FWF Lise Meitner (Grant M 3319), Spanish Agencia Estatal de Investigación (project PID2022-141539NBI00), European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement\r\nN◦ 725253–EyeCode), Swiss National Science Foundation (Grant no. 200502), and academic gifts from Meta. We thank Dmitry Lubyako and Ali Özgür Yöntem for building the turntable for our experiment.","year":"2023"},{"language":[{"iso":"eng"}],"publication":"ACM Transactions on Graphics","title":"Closed-loop control of direct ink writing via reinforcement learning","issue":"4","article_processing_charge":"No","date_updated":"2023-05-31T12:38:21Z","oa":1,"has_accepted_license":"1","intvolume":"        41","status":"public","type":"journal_article","arxiv":1,"author":[{"last_name":"Piovarci","id":"62E473F4-5C99-11EA-A40E-AF823DDC885E","first_name":"Michael","full_name":"Piovarci, Michael"},{"full_name":"Foshey, Michael","first_name":"Michael","last_name":"Foshey"},{"last_name":"Xu","first_name":"Jie","full_name":"Xu, Jie"},{"full_name":"Erps, Timothy","first_name":"Timothy","last_name":"Erps"},{"last_name":"Babaei","first_name":"Vahid","full_name":"Babaei, Vahid"},{"first_name":"Piotr","full_name":"Didyk, Piotr","last_name":"Didyk"},{"first_name":"Szymon","full_name":"Rusinkiewicz, Szymon","last_name":"Rusinkiewicz"},{"last_name":"Matusik","full_name":"Matusik, Wojciech","first_name":"Wojciech"},{"first_name":"Bernd","full_name":"Bickel, Bernd","orcid":"0000-0001-6511-9385","last_name":"Bickel","id":"49876194-F248-11E8-B48F-1D18A9856A87"}],"file":[{"creator":"dernst","content_type":"application/pdf","file_size":33994829,"access_level":"open_access","relation":"main_file","file_name":"2022_ACM_acceptedversion_Piovarci.pdf","checksum":"27f6fe41c6ff84d50445cc9b0176d45b","file_id":"11467","success":1,"date_updated":"2022-06-28T08:32:58Z","date_created":"2022-06-28T08:32:58Z"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","oa_version":"Submitted Version","day":"01","publication_identifier":{"issn":["0730-0301"],"eissn":["1557-7368"]},"month":"06","_id":"11442","article_type":"original","file_date_updated":"2022-06-28T08:32:58Z","doi":"10.1145/3528223.3530144","citation":{"apa":"Piovarci, M., Foshey, M., Xu, J., Erps, T., Babaei, V., Didyk, P., … Bickel, B. (2022). Closed-loop control of direct ink writing via reinforcement learning. <i>ACM Transactions on Graphics</i>. Association for Computing Machinery. <a href=\"https://doi.org/10.1145/3528223.3530144\">https://doi.org/10.1145/3528223.3530144</a>","mla":"Piovarci, Michael, et al. “Closed-Loop Control of Direct Ink Writing via Reinforcement Learning.” <i>ACM Transactions on Graphics</i>, vol. 41, no. 4, 112, Association for Computing Machinery, 2022, doi:<a href=\"https://doi.org/10.1145/3528223.3530144\">10.1145/3528223.3530144</a>.","ista":"Piovarci M, Foshey M, Xu J, Erps T, Babaei V, Didyk P, Rusinkiewicz S, Matusik W, Bickel B. 2022. Closed-loop control of direct ink writing via reinforcement learning. ACM Transactions on Graphics. 41(4), 112.","chicago":"Piovarci, Michael, Michael Foshey, Jie Xu, Timothy Erps, Vahid Babaei, Piotr Didyk, Szymon Rusinkiewicz, Wojciech Matusik, and Bernd Bickel. “Closed-Loop Control of Direct Ink Writing via Reinforcement Learning.” <i>ACM Transactions on Graphics</i>. Association for Computing Machinery, 2022. <a href=\"https://doi.org/10.1145/3528223.3530144\">https://doi.org/10.1145/3528223.3530144</a>.","ama":"Piovarci M, Foshey M, Xu J, et al. Closed-loop control of direct ink writing via reinforcement learning. <i>ACM Transactions on Graphics</i>. 2022;41(4). doi:<a href=\"https://doi.org/10.1145/3528223.3530144\">10.1145/3528223.3530144</a>","ieee":"M. Piovarci <i>et al.</i>, “Closed-loop control of direct ink writing via reinforcement learning,” <i>ACM Transactions on Graphics</i>, vol. 41, no. 4. Association for Computing Machinery, 2022.","short":"M. Piovarci, M. Foshey, J. Xu, T. Erps, V. Babaei, P. Didyk, S. Rusinkiewicz, W. Matusik, B. Bickel, ACM Transactions on Graphics 41 (2022)."},"date_created":"2022-06-10T06:41:47Z","year":"2022","acknowledgement":"This work is graciously supported by the following grant agencies: FWF Lise Meitner (Grant M 3319), SNSF (Grant 200502), ERC Starting Grant (MATERIALIZABLE-715767), NSF (Grant IIS-181507).\r\n","related_material":{"link":[{"relation":"press_release","description":"News on ISTA website","url":"https://ista.ac.at/en/news/machine-learning-3d-printing-fluids/"}]},"article_number":"112","ec_funded":1,"project":[{"grant_number":"M03319","_id":"eb901961-77a9-11ec-83b8-f5c883a62027","name":"Perception-Aware Appearance Fabrication"},{"_id":"24F9549A-B435-11E9-9278-68D0E5697425","grant_number":"715767","call_identifier":"H2020","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling"}],"volume":41,"quality_controlled":"1","department":[{"_id":"BeBi"}],"date_published":"2022-06-01T00:00:00Z","publisher":"Association for Computing Machinery","publication_status":"published","abstract":[{"lang":"eng","text":"Enabling additive manufacturing to employ a wide range of novel, functional materials can be a major boost to this technology. However, making such materials printable requires painstaking trial-and-error by an expert operator,\r\nas they typically tend to exhibit peculiar rheological or hysteresis properties. Even in the case of successfully finding the process parameters, there is no guarantee of print-to-print consistency due to material differences between batches. These challenges make closed-loop feedback an attractive option where the process parameters are adjusted on-the-fly. There are several challenges for designing an efficient controller: the deposition parameters are complex and highly coupled, artifacts occur after long time horizons, simulating the deposition is computationally costly, and learning on hardware is intractable. In this work, we demonstrate the feasibility of learning a closed-loop control policy for additive manufacturing using reinforcement learning. We show that approximate, but efficient, numerical simulation is\r\nsufficient as long as it allows learning the behavioral patterns of deposition that translate to real-world experiences. In combination with reinforcement learning, our model can be used to discover control policies that outperform\r\nbaseline controllers. Furthermore, the recovered policies have a minimal sim-to-real gap. We showcase this by applying our control policy in-vivo on a single-layer, direct ink writing printer. "}],"external_id":{"arxiv":["2201.11819"]},"tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)","image":"/images/cc_by.png","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"ddc":["000"]},{"publication":"SIGGRAPH Asia 2022 Conference Papers","language":[{"iso":"eng"}],"scopus_import":"1","has_accepted_license":"1","intvolume":"      2022","date_updated":"2023-02-13T09:15:25Z","oa":1,"article_processing_charge":"No","title":"Gloss management for consistent reproduction of real and virtual objects","type":"conference","status":"public","conference":{"name":"SIGGRAPH: Computer Graphics and Interactive Techniques Conference","start_date":"2022-12-06","location":"Daegu, South Korea","end_date":"2022-12-09"},"month":"11","publication_identifier":{"isbn":["9781450394703"]},"oa_version":"Published Version","day":"01","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","file":[{"creator":"dernst","relation":"main_file","file_size":28826826,"content_type":"application/pdf","access_level":"open_access","success":1,"file_name":"2022_ACM_SIGGRAPH_Chen.pdf","file_id":"12351","checksum":"f47f3215ab8bb919e3546b3438c34c21","date_created":"2023-01-24T07:35:21Z","date_updated":"2023-01-24T07:35:21Z"}],"author":[{"last_name":"Chen","first_name":"Bin","full_name":"Chen, Bin"},{"id":"62E473F4-5C99-11EA-A40E-AF823DDC885E","last_name":"Piovarci","full_name":"Piovarci, Michael","first_name":"Michael"},{"first_name":"Chao","full_name":"Wang, Chao","last_name":"Wang"},{"last_name":"Seidel","full_name":"Seidel, Hans-Peter","first_name":"Hans-Peter"},{"last_name":"Didyk","full_name":"Didyk, Piotr","first_name":"Piotr"},{"first_name":"Karol","full_name":"Myszkowski, Karol","last_name":"Myszkowski"},{"last_name":"Serrano","first_name":"Ana","full_name":"Serrano, Ana"}],"doi":"10.1145/3550469.3555406","file_date_updated":"2023-01-24T07:35:21Z","_id":"12135","article_number":"35","acknowledgement":"This work is supported by FWF Lise Meitner (Grant M 3319), European Research Council (project CHAMELEON, Grant no. 682080), Swiss National Science Foundation (Grant no. 200502), and academic gifts from Meta.","year":"2022","date_created":"2023-01-12T12:03:56Z","citation":{"apa":"Chen, B., Piovarci, M., Wang, C., Seidel, H.-P., Didyk, P., Myszkowski, K., &#38; Serrano, A. (2022). Gloss management for consistent reproduction of real and virtual objects. In <i>SIGGRAPH Asia 2022 Conference Papers</i> (Vol. 2022). Daegu, South Korea: Association for Computing Machinery. <a href=\"https://doi.org/10.1145/3550469.3555406\">https://doi.org/10.1145/3550469.3555406</a>","short":"B. Chen, M. Piovarci, C. Wang, H.-P. Seidel, P. Didyk, K. Myszkowski, A. Serrano, in:, SIGGRAPH Asia 2022 Conference Papers, Association for Computing Machinery, 2022.","ama":"Chen B, Piovarci M, Wang C, et al. Gloss management for consistent reproduction of real and virtual objects. In: <i>SIGGRAPH Asia 2022 Conference Papers</i>. Vol 2022. Association for Computing Machinery; 2022. doi:<a href=\"https://doi.org/10.1145/3550469.3555406\">10.1145/3550469.3555406</a>","ieee":"B. Chen <i>et al.</i>, “Gloss management for consistent reproduction of real and virtual objects,” in <i>SIGGRAPH Asia 2022 Conference Papers</i>, Daegu, South Korea, 2022, vol. 2022.","ista":"Chen B, Piovarci M, Wang C, Seidel H-P, Didyk P, Myszkowski K, Serrano A. 2022. Gloss management for consistent reproduction of real and virtual objects. SIGGRAPH Asia 2022 Conference Papers. SIGGRAPH: Computer Graphics and Interactive Techniques Conference vol. 2022, 35.","mla":"Chen, Bin, et al. “Gloss Management for Consistent Reproduction of Real and Virtual Objects.” <i>SIGGRAPH Asia 2022 Conference Papers</i>, vol. 2022, 35, Association for Computing Machinery, 2022, doi:<a href=\"https://doi.org/10.1145/3550469.3555406\">10.1145/3550469.3555406</a>.","chicago":"Chen, Bin, Michael Piovarci, Chao Wang, Hans-Peter Seidel, Piotr Didyk, Karol Myszkowski, and Ana Serrano. “Gloss Management for Consistent Reproduction of Real and Virtual Objects.” In <i>SIGGRAPH Asia 2022 Conference Papers</i>, Vol. 2022. Association for Computing Machinery, 2022. <a href=\"https://doi.org/10.1145/3550469.3555406\">https://doi.org/10.1145/3550469.3555406</a>."},"publisher":"Association for Computing Machinery","date_published":"2022-11-01T00:00:00Z","department":[{"_id":"BeBi"}],"volume":2022,"quality_controlled":"1","project":[{"grant_number":"M03319","_id":"eb901961-77a9-11ec-83b8-f5c883a62027","name":"Perception-Aware Appearance Fabrication"}],"ddc":["000"],"tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)","image":"/images/cc_by.png","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"abstract":[{"text":"A good match of material appearance between real-world objects and their digital on-screen representations is critical for many applications such as fabrication, design, and e-commerce. However, faithful appearance reproduction is challenging, especially for complex phenomena, such as gloss. In most cases, the view-dependent nature of gloss and the range of luminance values required for reproducing glossy materials exceeds the current capabilities of display devices. As a result, appearance reproduction poses significant problems even with accurately rendered images. This paper studies the gap between the gloss perceived from real-world objects and their digital counterparts. Based on our psychophysical experiments on a wide range of 3D printed samples and their corresponding photographs, we derive insights on the influence of geometry, illumination, and the display’s brightness and measure the change in gloss appearance due to the display limitations. Our evaluation experiments demonstrate that using the prediction to correct material parameters in a rendering system improves the match of gloss appearance between real objects and their visualization on a display device.","lang":"eng"}],"publication_status":"published"}]