No-Reference Quality Metric of Blocking Artifacts Based on Color Discontinuity Analysis

Leida LI  Hancheng ZHU  Jiansheng QIAN  Jeng-Shyang PAN  

IEICE TRANSACTIONS on Information and Systems   Vol.E97-D   No.4   pp.993-997
Publication Date: 2014/04/01
Online ISSN: 1745-1361
DOI: 10.1587/transinf.E97.D.993
Type of Manuscript: LETTER
Category: Image Processing and Video Processing
image quality assessment,  blocking artifact,  color discontinuity,  

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This letter presents a no-reference blocking artifact measure based on analysis of color discontinuities in YUV color space. Color shift and color disappearance are first analyzed in JPEG images. For color-shifting and color-disappearing areas, the blocking artifact scores are obtained by computing the gradient differences across the block boundaries in U component and Y component, respectively. An overall quality score is then produced as the average of the local ones. Extensive simulations and comparisons demonstrate the efficiency of the proposed method.