A Spatially Adaptive Gradient-Projection Algorithm to Remove Coding Artifacts of H.264
- Authors
- Choi, Kwon-Yul; Hong, Min-Cheol
- Issue Date
- May-2011
- Publisher
- IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
- Keywords
- H.264; coding artifacts; weighted constrained least squares; human visual system; projection onto convex sets
- Citation
- IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS, v.E94D, no.5, pp.1073 - 1081
- Journal Title
- IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS
- Volume
- E94D
- Number
- 5
- Start Page
- 1073
- End Page
- 1081
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/13670
- DOI
- 10.1587/transinf.E94.D.1073
- ISSN
- 0916-8532
- Abstract
- In this paper, we propose a spatially adaptive gradient-projection algorithm for the H.264 video coding standard to remove coding artifacts using local statistics. A hybrid method combining a new weighted constrained least squares (WCLS) approach and the projection onto convex sets (POCS) approach is introduced, where weighting components are determined on the basis of the human visual system (HVS) and projection set is defined by the difference between adjacent pixels and the quantization index (QI). A new visual function is defined to determine the weighting matrices controlling the degree of global smoothness, and a projection set is used to obtain a solution satisfying local smoothing constraints, so that the coding artifacts such as blocking and ringing artifacts can be simultaneously removed. The experimental results show the capability and efficiency of the proposed algorithm.
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