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Title: Nonlocal In-Loop Filter: The Way Toward Next-Generation Video Coding?
Authors: Ma, Siwei
Zhang, Xinfeng
Zhang, Jian
Jia, Chuanmin
Wang, Shiqi
Gao, Wen
Keywords: Image coding
Image reconstruction
Issue Date: 2016
Source: Ma, S., Zhang, X., Zhang, J., Jia, C., Wang, S., & Gao, W. (2016). Nonlocal In-Loop Filter: The Way Toward Next-Generation Video Coding? IEEE MultiMedia, 23(2), 16-26.
Series/Report no.: IEEE MultiMedia
Abstract: In-loop filtering has emerged as an essential coding tool since H.264/AVC, due to its delicate design, which reduces different kinds of compression artifacts. However, existing in-loop filters rely only on local image correlations, largely ignoring nonlocal similarities. In this article, the authors explore the design philosophy of in-loop filters and discuss their vision for the future of in-loop filter research by examining the potential of nonlocal similarities. Specifically, the group-based sparse representation, which jointly exploits an image's local and nonlocal self-similarities, lays a novel and meaningful groundwork for in-loop filter design. Hard- and soft-thresholding filtering operations are applied to derive the sparse parameters that are appropriate for compression artifact reduction. Experimental results show that this in-loop filter design can significantly improve the compression performance of the High Efficiency Video Coding (HEVC) standard, leading us in a new direction for improving compression efficiency.
ISSN: 1070-986X
DOI: 10.1109/MMUL.2016.16
Schools: School of Electrical and Electronic Engineering 
Rights: © 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
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