{"type":"ScholarlyArticle","title":"Invertible Residual Rescaling Models","authors":[{"name":"Jinmin Li","slug":"jinmin-li","given":"Jinmin","family":"Li","affiliation":"Tsinghua Shenzhen International Graduate School , Tsinghua University"},{"name":"Tao Dai","slug":"tao-dai","given":"Tao","family":"Dai","affiliation":"College of Computer Science and Software Engineering , Shenzhen University"},{"name":"Yaohua Zha","slug":"yaohua-zha","given":"Yaohua","family":"Zha","affiliation":"Tsinghua Shenzhen International Graduate School , Tsinghua University; Research Center of Artificial Intelligence , Peng Cheng Laboratory"},{"name":"Yilu Luo","slug":"yilu-luo","given":"Yilu","family":"Luo","affiliation":"Tsinghua Shenzhen International Graduate School , Tsinghua University"},{"name":"Longfei Lu","slug":"longfei-lu","given":"Longfei","family":"Lu","affiliation":"Tsinghua Shenzhen International Graduate School , Tsinghua University"},{"name":"Bin Chen","slug":"bin-chen","given":"Bin","family":"Chen","affiliation":"Department of Computer Science and Technology , Harbin Institute of Technology , Shenzhen"},{"name":"Zhi Wang","slug":"zhi-wang","given":"Zhi","family":"Wang","affiliation":"Tsinghua Shenzhen International Graduate School , Tsinghua University"},{"name":"Shu-Tao Xia","slug":"shu-tao-xia","given":"Shu-Tao","family":"Xia","affiliation":"Tsinghua Shenzhen International Graduate School , Tsinghua University; Research Center of Artificial Intelligence , Peng Cheng Laboratory"},{"name":"Jingyun Zhang","slug":"jingyun-zhang","given":"Jingyun","family":"Zhang","affiliation":"WeChat Pay Lab33 , Tencent"}],"abstract":"Invertible Rescaling Networks (IRNs) and their variants have witnessed remarkable achievements in various image processing tasks like image rescaling. However, we observe that IRNs with deeper networks are difficult to train, thus hindering the representational ability of IRNs. To address this issue, we propose Invertible Residual Rescaling Models (IRRM) for image rescaling by learning a bijection between a high-resolution image and its low-resolution counterpart with a specific distribution. Specifically, we propose IRRM to build a deep network, which contains several Residual Downscaling Modules (RDMs) with long skip connections. Each RDM consists of several Invertible Residual Blocks (IRBs) with short connections. In this way, RDM allows rich low-frequency information to be bypassed by skip connections and forces models to focus on extracting high-frequency information from the image. Extensive experiments show that our IRRM performs significantly better than other state-of-the-art methods with much fewer parameters and complexity. Particularly, our IRRM has respectively PSNR gains of at least 0.3 dB over HCFlow and IRN in the  x4 rescaling while only using 60% parameters and 50% FLOPs. The code will be available at https://github.com/THU-Kingmin/IRRM.","doi":"10.24963/ijcai.2024/109","url":"https://ijcai.org/proceedings/2024/109","pdf":"https://ijcai.org/proceedings/2024/0109.pdf","markdown":"https://ijcai.org/proceedings/2024/109.md","bibtex":"https://ijcai.org/proceedings/2024/bibtex/109","volume":{"slug":"2024","title":"Proceedings of the Thirty-Third International Joint Conference on Artificial Intelligence","short_title":"IJCAI 2024","url":"https://ijcai.org/proceedings/2024/","year":2024,"location":"Jeju, Korea","dates":"3-9 August 2024","editors":"Kate Larson","isbn":"978-1-956792-04-1","publisher":"International Joint Conferences on Artificial Intelligence Organization","doi_prefix":"10.24963/ijcai.2024"},"section":"Computer Vision","track":"Main Track","number":109,"pages":{"first":983,"last":991},"keywords":["Computer Vision: CV: Applications","Computer Vision: CV: Image and video synthesis and generation"],"videos":[],"references":[{"position":1,"raw":"[Agustsson and Timofte, 2017] Eirikur Agustsson and Radu Timofte. 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