A new image quality assessment method to detect and measure strength of blocking artifacts

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Currently, most image compression standards use block based transform coding [1]. Various types of compression artifacts will occur in such block based transform coded images [2]. Blocking artifacts are one of the most annoying problems that degrade the perceived image quality.

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Signal Processing: Image Communication 27 (2012) 3138Contents lists available at SciVerse ScienceDirectSignal Processing: Image Communicationjournal homepage: www.elsevier.com/locate/imageA new image quality assessment method to detect and measurestrength of blocking artifactsSangwoo Lee a, Sang Ju Park b,nabDepartment of Electronics, Information and Communication Engineering, Hongik University, 72-1, Sangsu-Dong, Mapo-Gu, Seoul 121-791, Republic of KoreaSchool of Electronic and Electrical Engineering, Hongik University, 72-1, Sangsu-Dong, Mapo-Gu, Seoul 121-791, Republic of Koreaa r t i c l e i n f oabstractArticle history:Received 17 November 2010Accepted 1 August 2011Available online 17 August 2011Block based transform coding is one of the most popular techniques for image and videocompression. However it suffers from several visual quality degradation factors, mostnotably from blocking artifacts. The subjective picture quality degradation caused byblocking artifacts, in general, does not agree well with the popular objective qualitymeasure such as PSNR.A new image quality assessment method that detects and measures strength ofblocking artifacts for block based transform coded images is proposed. In order tocharacterize the blocking artifacts, we utilize two observations: if blocking artifactsoccur on the block boundary, the pixel value changes abruptly across the boundary andthe same pixel values usually span along the entire length of

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