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index.xml
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<?xml version="1.0" encoding="utf-8" standalone="yes" ?>
<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
<channel>
<title>MICV</title>
<link>http://localhost:1313/</link>
<atom:link href="http://localhost:1313/index.xml" rel="self" type="application/rss+xml" />
<description>MICV</description>
<generator>Hugo Blox Builder (https://hugoblox.com)</generator><language>en-us</language><lastBuildDate>Mon, 24 Oct 2022 00:00:00 +0000</lastBuildDate>
<image>
<url>http://localhost:1313/media/icon_huc20aa2f6f5c0a6f78f1951b0621355e5_26767_512x512_fill_lanczos_center_3.png</url>
<title>MICV</title>
<link>http://localhost:1313/</link>
</image>
<item>
<title>Example Event</title>
<link>http://localhost:1313/event/example/</link>
<pubDate>Sat, 01 Jun 2030 13:00:00 +0000</pubDate>
<guid>http://localhost:1313/event/example/</guid>
<description><p>Slides can be added in a few ways:</p>
<ul>
<li><strong>Create</strong> slides using Wowchemy&rsquo;s <a href="https://docs.hugoblox.com/managing-content/#create-slides" target="_blank" rel="noopener"><em>Slides</em></a> feature and link using <code>slides</code> parameter in the front matter of the talk file</li>
<li><strong>Upload</strong> an existing slide deck to <code>static/</code> and link using <code>url_slides</code> parameter in the front matter of the talk file</li>
<li><strong>Embed</strong> your slides (e.g. Google Slides) or presentation video on this page using <a href="https://docs.hugoblox.com/writing-markdown-latex/" target="_blank" rel="noopener">shortcodes</a>.</li>
</ul>
<p>Further event details, including page elements such as image galleries, can be added to the body of this page.</p>
</description>
</item>
<item>
<title>Two papers early-accepted for MICCAI 2024</title>
<link>http://localhost:1313/post/2024-05-01-two-papers-early-accepted-for-miccai-2024/</link>
<pubDate>Wed, 01 May 2024 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2024-05-01-two-papers-early-accepted-for-miccai-2024/</guid>
<description></description>
</item>
<item>
<title>Funding : 우수신진연구</title>
<link>http://localhost:1313/post/2024-04-03-funding-%EC%9A%B0%EC%88%98%EC%8B%A0%EC%A7%84%EC%97%B0%EA%B5%AC/</link>
<pubDate>Wed, 03 Apr 2024 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2024-04-03-funding-%EC%9A%B0%EC%88%98%EC%8B%A0%EC%A7%84%EC%97%B0%EA%B5%AC/</guid>
<description><p>NeuroGPT: 치매 진단보조를 위한 뇌영상 및 전자의무기록 중심 멀티모달 대화형 생성모델 개발</p></description>
</item>
<item>
<title>Funding - LG전자 & LG Display</title>
<link>http://localhost:1313/post/2024-04-02-funding-lg%EC%A0%84%EC%9E%90--lg-display/</link>
<pubDate>Tue, 02 Apr 2024 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2024-04-02-funding-lg%EC%A0%84%EC%9E%90--lg-display/</guid>
<description></description>
</item>
<item>
<title>Received 2023 Distinguished Faculty Award - Teaching</title>
<link>http://localhost:1313/post/2024-04-01-received-2023-distinguished-faculty-award-teaching/</link>
<pubDate>Mon, 01 Apr 2024 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2024-04-01-received-2023-distinguished-faculty-award-teaching/</guid>
<description><p>2023 우수업적교수상: 교육부문</p></description>
</item>
<item>
<title>Funding - 서울혁신챌린지(본선)</title>
<link>http://localhost:1313/post/2024-03-01-funding-%EC%84%9C%EC%9A%B8%ED%98%81%EC%8B%A0%EC%B1%8C%EB%A6%B0%EC%A7%80%EB%B3%B8%EC%84%A0/</link>
<pubDate>Fri, 01 Mar 2024 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2024-03-01-funding-%EC%84%9C%EC%9A%B8%ED%98%81%EC%8B%A0%EC%B1%8C%EB%A6%B0%EC%A7%80%EB%B3%B8%EC%84%A0/</guid>
<description><p>인공지능 기반의 안드로겐 탈모 진단 시스템 연구개발</p></description>
</item>
<item>
<title>EAGLE accepted to CVPR'24 as a Highlight paper Congrats to co-authors Chanyoung Kim, Woojung Han, and Dayun Ju!</title>
<link>http://localhost:1313/post/2024-02-01-cvpr24-our-work-eagle/</link>
<pubDate>Thu, 01 Feb 2024 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2024-02-01-cvpr24-our-work-eagle/</guid>
<description><p>Eigen Aggregation Learning for Object-Centric Unsupervised Semantic Segmentation accepted to CVPR'24 as a Highlight paper. Congrats to co-authors Chanyoung Kim, Woojung Han, and Dayun Ju!</p></description>
</item>
<item>
<title>Yeongjun Jun, Sujung Hong, Junhyeok Kim, Jiwoo Park, and Suhyun Kim join our lab</title>
<link>http://localhost:1313/post/2024-01-01-yeongjun-jun-sujung-hong-junhyeok-kim-jiwoo-park-and-suhyun-kim-join-our-lab/</link>
<pubDate>Mon, 01 Jan 2024 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2024-01-01-yeongjun-jun-sujung-hong-junhyeok-kim-jiwoo-park-and-suhyun-kim-join-our-lab/</guid>
<description></description>
</item>
<item>
<title>Funding - 서울혁신챌린지(예선)</title>
<link>http://localhost:1313/post/2023-08-02-funding-%EC%84%9C%EC%9A%B8%ED%98%81%EC%8B%A0%EC%B1%8C%EB%A6%B0%EC%A7%80%EC%98%88%EC%84%A0/</link>
<pubDate>Wed, 02 Aug 2023 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2023-08-02-funding-%EC%84%9C%EC%9A%B8%ED%98%81%EC%8B%A0%EC%B1%8C%EB%A6%B0%EC%A7%80%EC%98%88%EC%84%A0/</guid>
<description><p>인공지능 기반의 안드로겐 탈모 진단 시스템 연구개발</p></description>
</item>
<item>
<title>Accepted to Medical Image Analysis</title>
<link>http://localhost:1313/post/2023-08-01-accepted-to-medical-image-analysis/</link>
<pubDate>Tue, 01 Aug 2023 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2023-08-01-accepted-to-medical-image-analysis/</guid>
<description><p>Congrats to Mahbaneh!</p></description>
</item>
<item>
<title>Funding - 한국연구재단 / 기초연구실</title>
<link>http://localhost:1313/post/2023-07-02-funding-%ED%95%9C%EA%B5%AD%EC%97%B0%EA%B5%AC%EC%9E%AC%EB%8B%A8---%EA%B8%B0%EC%B4%88%EC%97%B0%EA%B5%AC%EC%8B%A4/</link>
<pubDate>Sun, 02 Jul 2023 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2023-07-02-funding-%ED%95%9C%EA%B5%AD%EC%97%B0%EA%B5%AC%EC%9E%AC%EB%8B%A8---%EA%B8%B0%EC%B4%88%EC%97%B0%EA%B5%AC%EC%8B%A4/</guid>
<description><p>CT 영상 화질개선을 위한 인공지능 연구실</p></description>
</item>
<item>
<title>Funding - 한국연구재단/데이터 기반 디지털 바이오 선도사업</title>
<link>http://localhost:1313/post/2023-07-01-funding-%ED%95%9C%EA%B5%AD%EC%97%B0%EA%B5%AC%EC%9E%AC%EB%8B%A8-%EB%8D%B0%EC%9D%B4%ED%84%B0-%EA%B8%B0%EB%B0%98-%EB%94%94%EC%A7%80%ED%84%B8-%EB%B0%94%EC%9D%B4%EC%98%A4-%EC%84%A0%EB%8F%84%EC%82%AC%EC%97%85/</link>
<pubDate>Sat, 01 Jul 2023 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2023-07-01-funding-%ED%95%9C%EA%B5%AD%EC%97%B0%EA%B5%AC%EC%9E%AC%EB%8B%A8-%EB%8D%B0%EC%9D%B4%ED%84%B0-%EA%B8%B0%EB%B0%98-%EB%94%94%EC%A7%80%ED%84%B8-%EB%B0%94%EC%9D%B4%EC%98%A4-%EC%84%A0%EB%8F%84%EC%82%AC%EC%97%85/</guid>
<description><p>바이오 빅데이터 기반 당뇨병 및 합병증 정밀 의료를 위한 AI 플랫폼 및 모델 개발</p></description>
</item>
<item>
<title>Advancing Text-Driven Chest X-Ray Generation with Policy-Based Reinforcement Learning</title>
<link>http://localhost:1313/publication/2024-miccai-cxrl/</link>
<pubDate>Mon, 01 May 2023 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/publication/2024-miccai-cxrl/</guid>
<description></description>
</item>
<item>
<title>Slice-Consistent 3D Volumetric Brain CT-to-MRI Translation with 2D Brownian Bridge Diffusion Model</title>
<link>http://localhost:1313/publication/2024-miccai-ct2mri/</link>
<pubDate>Mon, 01 May 2023 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/publication/2024-miccai-ct2mri/</guid>
<description></description>
</item>
<item>
<title>WoLF: Large Language Model Framework for CXR Understanding</title>
<link>http://localhost:1313/publication/2024-arxiv-wolf/</link>
<pubDate>Mon, 01 May 2023 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/publication/2024-arxiv-wolf/</guid>
<description></description>
</item>
<item>
<title>Dayun Ju and Chanyoung Kim join our lab</title>
<link>http://localhost:1313/post/2023-03-01-dayun-ju-and-chanyoung-kim-join-our-lab/</link>
<pubDate>Wed, 01 Mar 2023 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2023-03-01-dayun-ju-and-chanyoung-kim-join-our-lab/</guid>
<description></description>
</item>
<item>
<title>Accepted for Machine Learning on theoretical domain generalization</title>
<link>http://localhost:1313/post/2023-02-01-accepted-for-machine-learning-on-theoretical-domain-generalization/</link>
<pubDate>Wed, 01 Feb 2023 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2023-02-01-accepted-for-machine-learning-on-theoretical-domain-generalization/</guid>
<description><p>Congrats to Anthony!</p></description>
</item>
<item>
<title>EAGLE: Eigen Aggregation Learning for Object-Centric Unsupervised Semantic Segmentation</title>
<link>http://localhost:1313/publication/2024-cvpr-eagle/</link>
<pubDate>Wed, 01 Feb 2023 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/publication/2024-cvpr-eagle/</guid>
<description></description>
</item>
<item>
<title>Gayoon Choi, Taejin Jeong, and Jeahoon Joo join our lab</title>
<link>http://localhost:1313/post/2023-01-02-gayoon-choi-taejin-jeong-and-jeahoon-joo-join-our-lab/</link>
<pubDate>Mon, 02 Jan 2023 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2023-01-02-gayoon-choi-taejin-jeong-and-jeahoon-joo-join-our-lab/</guid>
<description></description>
</item>
<item>
<title>Accepted for ISBI 2023</title>
<link>http://localhost:1313/post/2023-01-01-accepted-for-isbi-2023/</link>
<pubDate>Sun, 01 Jan 2023 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2023-01-01-accepted-for-isbi-2023/</guid>
<description></description>
</item>
<item>
<title>Member</title>
<link>http://localhost:1313/people/</link>
<pubDate>Mon, 24 Oct 2022 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/people/</guid>
<description></description>
</item>
<item>
<title>Our paper won the Best Paper Award at UAI 2022</title>
<link>http://localhost:1313/post/2022-08-01-our-paper-won-the-best-paper-award-at-uai-2022/</link>
<pubDate>Mon, 01 Aug 2022 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2022-08-01-our-paper-won-the-best-paper-award-at-uai-2022/</guid>
<description></description>
</item>
<item>
<title>Yumin Kim, Seil Kang, Kyobin Choo, Hyunjin Kim, and Donghyun Kim join our lab</title>
<link>http://localhost:1313/post/2022-07-01-yumin-kim-seil-kang-kyobin-choo-hyunjin-kim-and-donghyun-kim-join-our-lab/</link>
<pubDate>Fri, 01 Jul 2022 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2022-07-01-yumin-kim-seil-kang-kyobin-choo-hyunjin-kim-and-donghyun-kim-join-our-lab/</guid>
<description></description>
</item>
<item>
<title>Accepted for UAI 2022, Eindhoven, the Netherlands for an Oral Presentation</title>
<link>http://localhost:1313/post/2022-05-01-accepted-for-uai-2022-eindhoven-the-netherlands-for-an-oral-presentation/</link>
<pubDate>Sun, 01 May 2022 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2022-05-01-accepted-for-uai-2022-eindhoven-the-netherlands-for-an-oral-presentation/</guid>
<description><p>Congrats to Anthony!</p></description>
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<title>Accepted for IJCAI 2022, Vienna</title>
<link>http://localhost:1313/post/2022-04-01-accepted-for-ijcai-2022-vienna/</link>
<pubDate>Fri, 01 Apr 2022 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2022-04-01-accepted-for-ijcai-2022-vienna/</guid>
<description><p>Congrats to Xingchen and Anthony!</p></description>
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<item>
<title>Joining as an Assistant Professor in the Department of Artificial Intelligence at Yonsei University</title>
<link>http://localhost:1313/post/2022-03-01-joining-as-an-assistant-professor-in-the-department-of-artificial-intelligence-at-yonsei-university/</link>
<pubDate>Sun, 13 Mar 2022 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2022-03-01-joining-as-an-assistant-professor-in-the-department-of-artificial-intelligence-at-yonsei-university/</guid>
<description></description>
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<title>Yujin Yang and Woojung Han join our lab</title>
<link>http://localhost:1313/post/2022-03-03-yujin-yang-and-woojung-han-join-our-lab/</link>
<pubDate>Thu, 03 Mar 2022 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2022-03-03-yujin-yang-and-woojung-han-join-our-lab/</guid>
<description></description>
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<title>Accepted for Findings of ACL 2022</title>
<link>http://localhost:1313/post/2022-03-02-accepted-for-findings-of-acl-2022/</link>
<pubDate>Wed, 02 Mar 2022 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2022-03-02-accepted-for-findings-of-acl-2022/</guid>
<description><p>Congrats to Anthony!</p></description>
</item>
<item>
<title>Accepted for NeuroImage</title>
<link>http://localhost:1313/post/2021-10-08-accepted-for-neuroimage/</link>
<pubDate>Fri, 08 Oct 2021 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2021-10-08-accepted-for-neuroimage/</guid>
<description><p>Congrats to Mahbaneh!</p></description>
</item>
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<title>Accepted for The First Workshop on Computer Vision for Automated Medical Diagnosis @ ICCV 2021</title>
<link>http://localhost:1313/post/2021-08-14-accepted-for-the-first-workshop-on-computer-vision-for-automated-medical-diagnosis-@-iccv-2021/</link>
<pubDate>Sat, 14 Aug 2021 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2021-08-14-accepted-for-the-first-workshop-on-computer-vision-for-automated-medical-diagnosis-@-iccv-2021/</guid>
<description><p>Congrats to Mahbaneh!</p></description>
</item>
<item>
<title>Accepted for MICCAI 2021, Virtual</title>
<link>http://localhost:1313/post/2021-06-07-accepted-for-miccai-2021-virtual/</link>
<pubDate>Mon, 07 Jun 2021 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2021-06-07-accepted-for-miccai-2021-virtual/</guid>
<description><p>Congrats to Anthony!</p></description>
</item>
<item>
<title>Accepted for MIDL 2021, Virtual</title>
<link>http://localhost:1313/post/2021-05-16-accepted-for-midl-2021-virtual/</link>
<pubDate>Sun, 16 May 2021 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2021-05-16-accepted-for-midl-2021-virtual/</guid>
<description><p>Congrats to Shibo!</p></description>
</item>
<item>
<title>Accepted for AAIC 2021, Denver, USA</title>
<link>http://localhost:1313/post/2021-03-11-accepted-for-aaic-2021-denver-usa/</link>
<pubDate>Thu, 11 Mar 2021 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2021-03-11-accepted-for-aaic-2021-denver-usa/</guid>
<description><p>Congrats to Mahbaneh!</p></description>
</item>
<item>
<title>Two Full Papers Accepted for ISBI 2021, Virtual</title>
<link>http://localhost:1313/post/2021-02-27-two-full-papers-accepted-for-isbi-2021-virtual/</link>
<pubDate>Sat, 27 Feb 2021 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2021-02-27-two-full-papers-accepted-for-isbi-2021-virtual/</guid>
<description><p>Congrats to Anthony and Xingchen!</p></description>
</item>
<item>
<title>Accepted for IPMI 2021, Virtual</title>
<link>http://localhost:1313/post/2021-02-10-accepted-for-ipmi-2021-virtual/</link>
<pubDate>Wed, 10 Feb 2021 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2021-02-10-accepted-for-ipmi-2021-virtual/</guid>
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<item>
<title>Received Alzheimer's Disease Research Center Developmental Project grant by Pitt ADRC for 2021-2022</title>
<link>http://localhost:1313/post/2020-12-16-received-alzheimers-disease-research-center-developmental-project-grant-by-pitt-adrc-for-2021-2022/</link>
<pubDate>Wed, 16 Dec 2020 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2020-12-16-received-alzheimers-disease-research-center-developmental-project-grant-by-pitt-adrc-for-2021-2022/</guid>
<description><p>A bias-resilient deep learning algorithm for robust white matter hyperintensity segmentation on Alzheimer’s disease data with confounding factors</p></description>
</item>
<item>
<title>Bye</title>
<link>http://localhost:1313/post/20-12-02-icml-best-paper/</link>
<pubDate>Wed, 02 Dec 2020 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/20-12-02-icml-best-paper/</guid>
<description><p>Congratulations to Jian Yang and Monica Hall for winning the Best Paper Award at the 2020 Conference on Wowchemy for their paper “Learning Wowchemy”.</p></description>
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<title>Accepted for The Anatomical Record</title>
<link>http://localhost:1313/post/2020-10-23-accepted-for-the-anatomical-record/</link>
<pubDate>Fri, 23 Oct 2020 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2020-10-23-accepted-for-the-anatomical-record/</guid>
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<title>Accepted for an Oral Presentation at The Workshop on BioImage Computing @ ECCV 2020</title>
<link>http://localhost:1313/post/2020-07-02-accepted-for-an-oral-presentation-at-the-workshop-on-bioimage-computing-@-eccv-2020/</link>
<pubDate>Thu, 02 Jul 2020 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2020-07-02-accepted-for-an-oral-presentation-at-the-workshop-on-bioimage-computing-@-eccv-2020/</guid>
<description></description>
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<title>Xingchen Zhao received the SCI Undergraduate Research Scholars award for Summer 2020</title>
<link>http://localhost:1313/post/2020-04-22-xingchen-zhao-received-the-sci-undergraduate-research-scholars-award-for-summer-2020/</link>
<pubDate>Wed, 22 Apr 2020 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2020-04-22-xingchen-zhao-received-the-sci-undergraduate-research-scholars-award-for-summer-2020/</guid>
<description><p>Congratulations!</p></description>
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<title>Accepted for ISBI 2020, Iowa City, USA</title>
<link>http://localhost:1313/post/2020-01-03-accepted-for-isbi-2020-iowa-city-usa/</link>
<pubDate>Fri, 03 Jan 2020 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2020-01-03-accepted-for-isbi-2020-iowa-city-usa/</guid>
<description></description>
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<title>Joining as an Assistant Professor in the Department of Computer Science at the University of Pittsburgh</title>
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<pubDate>Sat, 19 Oct 2019 00:00:00 +0000</pubDate>
<guid>http://localhost:1313/post/2019-10-19-joining-as-an-assistant-professor-in-the-department-of-computer-science-at-the-university-of-pittsburgh/</guid>
<description></description>
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<h1 class="title is-2 publication-title">CoBra: Complementary Branch Fusing Class and Semantic Knowledge for Robust Weakly Supervised Semantic Segmentation</h1>
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Overview illustration of our model, <b>Co</b>mplementary <b>Bra</b>nch (<b>CoBra</b>). <br>
The dual branch framework consists of the Class-Aware Knowledge branch with CNN and the Semantic-Aware Knowledge branch with ViT. They give complementary knowledge to each branch.
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While Class Activation Maps (CAMs) using CNNs have steadily been contributing to the success of WSSS, the resulting activation maps often narrowly focus on class-specific parts (e.g., only face of human). On the other hand, recent works based on vision transformers (ViT) have shown promising results based on their self-attention mechanism to capture the semantic parts but fail in capturing complete class-specific details (e.g., entire body parts of human but also with a dog nearby). <br>
The figure shows the comparison of object localization maps from each CNN, ViT, and Cobra branches for various subjects (human, dog, airplane), illustrating the distinctive areas of interest each model identifies. Our model successfully utilizes <b>complementary characteristics to localize the exact object of the correct class and its semantic parts.</b>
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<li>We propose a dual branch framework, namely <b>Co</b>mplementary <b>Bra</b>nch (<b>CoBra</b>), which aims to fuse the complementary nature of CNN and ViT localization maps. </li>
<li>We capture the class and semantic knowledge as Class Aware Projection (CAP) and Semantic-Aware Projection (SAP) respectively for effective complementary guidance to the CNN and ViT branches in CoBra, employing contrastive learning for enhanced guidance. </li>
<li>Extensive experiments qualitatively and quantitatively investigate how CNN and ViT complement each other on the PASCAL VOC 2012 dataset and MS COCO 2014 dataset, showing a state-of-the-art WSSS result. </li>
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Overview illustration of our model. <br>
<b>(I) Class Aware Knoweldge(CAK)</b>: The CNN outputs a feature map which generates (1) CNN CAMs via $f_{CAM}$, (2) Pseudo-Labels from CNN CAMs via $argmax$, and (3) Class-Aware Projection (CAP) via $f_{proj}$. <br>
<b>(II) Semantic Aware Knowledge(SAK)</b>: The ViT outputs $N^2$ Patch Embeddings which generate (1) ViT CAMs via $f_{CAM}$ and (2) Semantic-Aware Projection (SAP) via $f_{proj}$. We also use the Attention Maps of all $L$-layers to generate (3) Patch Affinity of size $N^2 \times N^2$.
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<p>
Illustration of refining CAP and SAP from SAK and CAK branch respectively. <br>
<b>(I) Class Aware Knoweldge(CAK)</b>: The CAP values are embedded in the Class Feature Space. (1) The patch affinity from SAK branch assigns the positive (green), negative (red), and neutral (teal) patches based on the target (white) patch. (2) The CNN CAM shows that the false negative patches have been weakly localized as horse. (3) The CAP loss pull those weakly localized patches (i.e., false class negatives) since they are assigned as semantically positive patches based on SAK branch. (3) The CAP is refined to improve the CNN CAM showing fewer false class negatives. <br>
<b>(II) Semantic Aware Knowledge(SAK)</b>: The SAP values are embedded in the Semantic Feature Space. (1) The CNN CAM from CAK branch assigns the positive (green), negative (red), and neutral (teal) patches based on the target (white) patch. (2) The ViT CAM shows that the negative patches have been incorrectly localized as horse. The SAP loss pushes away those incorrectly localized patches (i.e., false class positives) since they are assigned as negative patches based on CAK branch. (3) The SAP is refined to improve the ViT CAM showing fewer false class positives.
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<p>
Evaluation of initial seed and corresponding pseudo segmentation mask on PASCAL VOC 2012 training set in mIoU (%).
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<h4 class="title is-3 has-text-centered">Pascal VOC 2012 segmentation results</h3>
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Semantic segmentation results on the validation (Val) and Test set of PASCAL VOC 2012 dataset. Sup. (Supervision) : Image (I) and Saliency Map (S).
</p>
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<h4 class="title is-3 has-text-centered">MS-COCO 2014 segmentation results</h3>
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<p>
Semgentation mIoU results(%) on MS-COCO 2014 val dataset
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<h3 class="title is-3 has-text-centered">Qualitative Experiments</h3>
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<p>
Qualitative results. From left: (1) Input image, (2) Our result, (3) CNN CAM of our model, (4) Ours without SAP Loss, (5) ViT CAM of our model, (6) Ours without CAP Loss, (7) Our Pseudo mask for segmentation and (8) ground-truth segmentation label. We see that our results are able to differentiate between classes while finding their accurate object boundaries.
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Qualitative seg results on the PASCAL VOC val set.
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Qualitative seg results on the MS COCO val set.
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<h1 class="title is-2 publication-title">Advancing Text-Driven Chest X-Ray Generation with Policy-Based Reinforcement Learning</h1>
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<strong><span class="author-block">Early Accept @ MICCAI 2024</span></strong>
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Woojung Han<sup>*</sup>,</span>
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Chanyoung Kim<sup>*</sup>,</span>
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Dayun Ju</a>,
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Yumin Shim</a>,
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Seong Jae Hwang
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<span class="author-block">Yonsei University</span>
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We introduce <b><i>CXRL</i></b>,
<br>Advancing Text-Driven Chest X-Ray Generation with Policy-Based Reinforcement Learning.
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<h2 class="title is-3">Abstract</h2>
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Recent advances in text-conditioned image generation diffusion models have begun paving the way for new opportunities in modern medical domain, in particular, generating Chest X-rays (CXRs) from diagnostic reports.
Nonetheless, to further drive the diffusion models to generate CXRs that faithfully reflect the complexity and diversity of real data, it has become evident that a nontrivial learning approach is needed.
In light of this, we propose CXRL, a framework motivated by the potential of reinforcement learning (RL).
Specifically, we integrate a policy gradient RL approach with well-designed multiple distinctive CXR-domain specific reward models.
This approach guides the diffusion denoising trajectory, achieving precise CXR posture and pathological details.
Here, considering the complex medical image environment, we present “RL with Comparative Feedback” (RLCF) for the reward mechanism, a human-like comparative evaluation that is known to be more effective and reliable in complex scenarios compared to direct evaluation.
Our CXRL framework includes jointly optimizing learnable adaptive condition embeddings (ACE) and the image generator, enabling the model to produce more accurate and higher perceptual CXR quality. Our extensive evaluation of the MIMIC-CXR-JPG dataset demonstrates the effectiveness of our RL-based tuning approach. Consequently, our CXRL generates pathologically realistic CXRs, establishing a new standard for generating CXRs with high fidelity to real-world clinical scenarios.
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<h3 class="title is-3 has-text-centered">Method</h3>
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<h4 class="title is-4 has-text-centered">Pipeline</h4>
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The pipeline of <i>CXRL</i>.
Our model employs policy gradient optimization utilizing multi-reward feedback, fine-tuning image generator, and ACE to produce realistic and accurate CXR that corresponds closely to the input report.
<br>
<b>Contribution</b>
<br>
<ul>
<li>Our study pioneers in applying RL to text-conditioned medical image synthesis, particularly in CXRs, focusing on detail refinement and input condition control for clinical accuracy.</li>
<li>We advance report-to-CXR generation with an RLCF-based rewarding mechanism, emphasizing posture alignment, pathology accuracy, and consistency between input reports and generated CXRs.</li>
<li>We jointly optimize the image generator and ACE via reward feedback models, ensuring image-text alignment and medical accuracy across varied reports, setting a new benchmark in a report-to-CXR generation.</li>
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<h4 class="title is-4 has-text-centered">Reward Feedback Models</h4>
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A detailed illustration of our reward feedback models. We incorporate three different feedbacks for report-to-CXR generation model to generate goal-oriented CXRs.
<ul>
<li><b>Posture Alignment Feedback</b>: Generated CXRs often face scaling issues, like excessive zooming or rotation, obscuring essential details. To counter these undesirable effects, we introduce a reward signal to align the CXR's posture with a canonical orientation to preserve essential parts.</li>
<li><b>Diagnostic Condition Feedback</b>: To accurately reflect generated CXRs with referenced pathologies, we classify them using a parsed report label, rewarding its accuracy.</li>
<li><b>Multimodal Consistency Feedback</b>: We enforce the generated CXRs to better match their reports. We leverage a multimodal latent representation pretrained with CXR-report pairs for semantic agreement assessment.</li>
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