Researchers improve speed and accuracy of 3D surface measurements

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Optics? </a> </li> <li class="nav-item"> <a class="nav-link d-inline-flex mr-0 pr-0 " href="/about/history/"> Living History </a> </li> <li class="nav-item"> <a class="nav-link d-inline-flex mr-0 pr-0 " href="/about/work_at_optica/"> Work at Optica </a> <ul class="nav nav-pills flex-column ml-2"> <li> <a class="nav-item nav-link " href="/about/work_at_optica/controller/"> Controller </a> </li> <li> <a class="nav-item nav-link " href="/about/work_at_optica/senior_meeting_manager/"> Senior Meeting Manager </a> </li> <li> <a class="nav-item nav-link " href="/about/work_at_optica/opn_senior_editor_content_director/"> OPN Senior Editor & Content Director </a> </li> <li> <a class="nav-item nav-link " href="/about/work_at_optica/it_support_specialist/"> IT Support Specialist </a> </li> </ul> </li> <li class="nav-item"> <a class="nav-link d-inline-flex mr-0 pr-0 " href="/about/contact/"> Contact Us </a> <ul class="nav nav-pills flex-column ml-2"> <li> <a class="nav-item nav-link " href="/about/contact/global_headquarters/"> Global Headquarters </a> </li> <li> <a class="nav-item nav-link " href="/about/contact/visit/"> Visit Optica </a> </li> </ul> </li> <li class="nav-item"> <a class="nav-link d-inline-flex mr-0 pr-0 " href="/about/policies/"> Policies </a> <ul class="nav nav-pills flex-column ml-2"> <li> <a class="nav-item nav-link " href="/about/policies/code_of_conduct/"> Code of Conduct </a> </li> <li> <a class="nav-item nav-link " href="/about/policies/event_policies_and_terms/"> Event Policies and Terms </a> </li> <li> <a class="nav-item nav-link " href="/about/policies/privacy_policy/"> Privacy Policy </a> </li> <li> <a class="nav-item nav-link " href="/about/policies/terms_of_use/"> Terms of Use </a> </li> <li> <a class="nav-item nav-link " href="/about/policies/cookie_notice/"> Cookie Notice </a> </li> <li> <a class="nav-item nav-link " href="/about/policies/funding_support_for_optica_events/"> Funding Support for Optica Events </a> </li> <li> <a class="nav-item nav-link " href="/about/policies/registration_waivers_for_emerging_economies/"> Registration Waivers for Emerging Economies </a> </li> <li> <a class="nav-item nav-link " href="/about/policies/payments/"> Recurring Payments </a> </li> </ul> </li> </ul> </div> </div> </div> <div class="col-lg-8" id="BodyContent"> <p>24 October 2024</p> <h2 class="text-center h4">Researchers improve speed and accuracy of 3D surface measurements</h2> <p class="lead text-center"><small><em>New technique could provide enhanced precision measurements for industrial inspection, medical imaging and robotic vision</em></small></p> <p>WASHINGTON — Researchers have developed a faster and more accurate method for acquiring and reconstructing high-quality 3D surface measurements.<b> </b>The approach could greatly improve the speed and accuracy of surface measurements used for industrial inspection, medical applications, robotic vision and more.</p> <div class="float-right col-5 ml-1"> <p><img alt="Rubidium transition" class="img-fluid" src="https://opticaorg-dev-cac7d2csctagc8bm.z01.azurefd.net/$web/optica/media/files/about/newsroom/2024/10oct/fig1.jpg" /></p> <p><small><strong>Caption</strong>: Researchers developed a faster and more accurate method for acquiring and reconstructing high-quality 3D surface measurements. The new fringe photometric stereo method requires fewer protected fringe patterns, which speeds up the scanning process. </small></p> <small><strong>Credit</strong>: Ce Zhu, University of Electronic Science and Technology of China</small> <p> </p> </div> <p>“Traditional 3D imaging works by comparing two viewpoints, similar to how our eyes work together to judge depth,” said research team leader Ce Zhu from the <a href="https://en.uestc.edu.cn/">University of Electronic Science and Technology of China</a>. “In contrast, our new approach ‘feels’ the surface by projecting light patterns, almost like running a hand over it to detect changes. This can reduce the number of patterns used by more than two-thirds, which greatly speeds up the scanning process, and surprisingly, is even more accurate than the old technique.”</p> <p><span style="text-autospace:none">In <a href="about:blank"><i>Optica</i></a>, <a href="about:blank">Optica Publishing Group</a></span><a href="about:blank">’s</a> journal for high-impact research, the researchers describe their new fringe photometric stereo method and show that it can achieve high frame rates and micrometer-level accuracy while halving the noise variance.</p> <p><span style="text-autospace:none">"Our approach is ideal for applications demanding real-time scanning, including industrial applications like detecting defects in printed circuit boards, batteries or oil pipelines as well as medical procedures such as diagnostics and implant customization,” said Zhu. “It could also help advance robotics by improving human-robot interaction or offering vision guidance for tasks like folding clothes."</span></p> <p><span style="text-autospace:none"><b>Faster acquisition time</b></span></p> <p><span style="text-autospace:none">Precise 3D surface measurements and reconstructions are typically acquired using a fringe projection profilometry method known as phase-shifting profilometry. Using this approach, a series of phase-shifted light patterns are projected onto an object's surface. The reflected images are then captured and the phase differences are analyzed to create a highly accurate 3D map of the surface.</span></p> <p><span style="text-autospace:none">However, this method isn’t useful for many applications because of its long scanning time, which primarily comes from the high number of multiple-frequency fringe images required to analyze phase differences. This step uses triangulation to take the phase data, which is limited to a specific range, and convert it into continuous values, allowing an accurate representation of the shape or surface. In the new work, the researchers developed a way to bypass this process and significantly reduce the number of fringe images required by using one frequency only. </span></p> <div class="float-right col-5 ml-1"> <p><img alt="Rubidium transition" class="img-fluid" src="https://opticaorg-dev-cac7d2csctagc8bm.z01.azurefd.net/$web/optica/media/files/about/newsroom/2024/10oct/figure_2.jpg" /></p> <small><strong>Caption</strong>: The traditional phase-shifting profilometry method requires projecting multiple fringe patterns and analyzing numerous images, resulting in long scanning times. In contrast, the new method (bottom) significantly reduces the number of frames needed, making the process faster and more accurate. </small> <p> </p> <small><strong>Credit</strong>: Ce Zhu, University of Electronic Science and Technology of China</small> <p> </p> </div> <p>To test their new fringe photometric stereo technique, the researchers set up an experimental system consisting of a 1280 × 960 camera with an 8-mm lens and a projector with a resolution of 912 × 1140. They used this setup to take measurements of single objects and groups of objects with continuous surfaces, including a human hand, a paper mask, a cloth toy, gypsum geometries and clay handicrafts. They also validated the approach using standard plane and sphere models, demonstrating that it effectively suppresses noise compared to traditional fringe projection profilometry.</p> <p><b>Creating better prosthetics</b></p> <p>“One application that this new method could be particularly useful for is customizing prosthetics,” says Zhu. “It can quickly acquire high-precision surface information from the residual limb, reducing errors associated with manual measurements and improving the fit of the prosthesis. This would also eliminate the need to apply plaster or other materials to the skin, making the experience much more comfortable for the patient.”</p> <p>Although the method currently offers improved scanning speed and accuracy for scenes with continuous surfaces, reconstructing the depth of objects with sudden depth changes remains challenging. The researchers are working to address this limitation by incorporating established surface reconstruction techniques from photometric stereo into their method. This should enable a wide range of promising applications and analysis of more complex scenes.</p> <p><b>Paper</b>: G. Zhang, K. Liu, S. Qu, C. Zhu, “Fringe Photometric Stereo,” Optica, 11, 1482-1485 (2024). </p> <p>DOI: <a href="https://doi.org/10.1364/OPTICA.531601">https://doi.org/10.1364/OPTICA.531601</a></p> <p><strong>About Optica Publishing Group</strong></p> <p><a href="\">Optica Publishing Group </a> is a division of the society, <a href="\">Optica</a>, Advancing Optics and Photonics Worldwide. It publishes the largest collection of peer-reviewed and most-cited content in optics and photonics, including 18 prestigious journals, the society’s flagship member magazine, and papers and videos from more than 835 conferences. With over 400,000 journal articles, conference papers and videos to search, discover and access, our publications portfolio represents the full range of research in the field from around the globe.</p> <p><strong>About Optica</strong></p> <p><em>Optica</em> is an open-access journal dedicated to the rapid dissemination of high-impact peer-reviewed research across the entire spectrum of optics and photonics. Published monthly by Optica Publishing Group, the Journal provides a forum for pioneering research to be swiftly accessed by the international community, whether that research is theoretical or experimental, fundamental or applied. Optica maintains a distinguished editorial board of more than 60 associate editors from around the world and is overseen by Editor-in-Chief Prem Kumar, Northwestern University, USA. For more information, visit <a href="{% GetResourceString(" pubsurl=""><em>Optica</em></a>.</p> <p><strong>Media Contact</strong></p> <p><a href="mailto:mediarelations@optica.org">mediarelations@optica.org</a></p> <div class="pull-right"><span class="lead">Share: </span> <a href="https://twitter.com/intent/tweet?text=&via=OpticaWorldwide&url=http%3A%2F%2Fwww.optica.org%2Fabout%2Fnewsroom%2Fnews_releases%2F2024%2Foctober%2Fresearchers_improve_speed_and_accuracy_of_3d_surface_measurements%2F&related=OpticaWorldwide" target="_blank" aria-label="Share on Twitter"><i class="fab fa-twitter-square fa-3x" aria-hidden="true"></i></a> <a href="https://www.facebook.com/sharer/sharer.php?u=http%3A%2F%2Fwww.optica.org%2Fabout%2Fnewsroom%2Fnews_releases%2F2024%2Foctober%2Fresearchers_improve_speed_and_accuracy_of_3d_surface_measurements%2F" target="_blank" aria-label="Share on Facebook"><i class="fab fa-facebook-square fa-3x" aria-hidden="true"></i></a> <a href="http://www.linkedin.com/shareArticle?mini=true&url=http%3A%2F%2Fwww.optica.org%2Fabout%2Fnewsroom%2Fnews_releases%2F2024%2Foctober%2Fresearchers_improve_speed_and_accuracy_of_3d_surface_measurements%2F&title=&source=Optica" target="_blank" aria-label="Share on LinkedIn"><i class="fab fa-linkedin fa-3x" aria-hidden="true"></i></a> <a href="http://www.reddit.com/submit?url=http%3A%2F%2Fwww.optica.org%2Fabout%2Fnewsroom%2Fnews_releases%2F2024%2Foctober%2Fresearchers_improve_speed_and_accuracy_of_3d_surface_measurements%2F" target="_blank" aria-label="Share on Reddit"><i class="fab fa-reddit-square fa-3x" aria-hidden="true"></i></a> </div> <script type="application/ld+json"> { "@context": "http://schema.org", "@type": "NewsArticle", "mainEntityOfPage": { "@type": "WebPage", "@id": "Researchers%20improve%20speed%20and%20accuracy%20of%203D%20surface%20measurements" }, "headline": "Researchers improve speed and accuracy of 3D surface measurements", "image": "", "author": { "@type": "Organization", "name": "Optica" }, "datePublished": "2024-10-24T13:17:56Z", "dateModified": "2024-10-28T11:31:21Z", "publisher": { "@type": "Organization", "name": "Optica", "logo": { "@type": "ImageObject", "url": "https://www.optica.org/osaorg/media/optica/brand/logos/Optica_logo_nodescriptor_black_rgb.png" } }, "description": "A new technique for acquiring and reconstructing high-quality 3D surface measurements could enhance the speed and accuracy of surface measurements used for industrial inspection, medical applications, robotic vision and more. 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Researchers improve speed and accuracy of 3D surface measurements | Optica