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http://dx.doi.org/10.3745/KIPSTB.2008.15-B.5.383

Image Quality Assessment by Measuring Blocking Artifacts  

Lee, Sang-Woo (홍익대학교 전자정보통신공학과)
Park, Sang-Ju (홍익대학교 전자전기공학부)
Publication Information
The KIPS Transactions:PartB / v.15B, no.5, 2008 , pp. 383-390 More about this Journal
Abstract
Block based transform coding is most popular approach for image and video compression. However it suffers from severe quality degradation especially from blocking artifacts. The subjective quality degradation caused by such blocking artifacts in general does not agree well with an objecive quality measurement such as PSNR. Hence new quality evaluation technique is necessary. We propose a new image quality assessment method by measuring blocking artifacts for block based transform coded images. In order to characterize blocking artifacts, proposed method utilizes the facts that, blocking artifacts, when occur, have different pixel values along the block boundaries and such differences usually continuously span along the whole boundaries. This method does not require the original uncompressed image. It operates on single block boundary and quantifies the amount of blocking artifacts on it. Experiments on various compressed images various bitrates show that proposed quantitative measure of blocking artifacts matches well with the subjective quality of them judged by human visual system.
Keywords
Blocking artifacts; Blockiness measure; Quantitative metric; Image quality;
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