De-Blocking Artifacts in DCT Domain Using Projection onto Convex Sets Algorithm

Hai-Feng XU  Song-Yu YU  Ci WANG  

IEICE TRANSACTIONS on Information and Systems   Vol.E89-D   No.8   pp.2460-2463
Publication Date: 2006/08/01
Online ISSN: 1745-1361
DOI: 10.1093/ietisy/e89-d.8.2460
Print ISSN: 0916-8532
Type of Manuscript: LETTER
Category: Image Processing and Video Processing
POCS,  blocking artifacts,  post-processing,  

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Based on the theory of block projection onto convex sets (BPOCS), a novel de-blocking algorithm is proposed. A new smoothness constraint set (SCS) is used to remove the unnecessary high frequencies. In addition, an adaptive quantization constraint set (AQCS) is employed to suppress error in the smoothing process. The proposed size and position of new SCS are different from traditional ones. Extensive experimental results are provided to demonstrate that the proposed method can achieve better image quality with fewer iterations.