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Unified Artifacts Reduction for Block DCT Compressed Images
Guangtao Zhai #,Yi Xu *,Xiaokang Yang,Wenjun Zhang,Songyu Yu
Institute of Image Communication and Information Processing, Shanghai Jiao Tong University
*Correspondence author
#Submitted by
Subject:
Funding: 教育部博士点基金等,国家自然科学基金,863计划,新世纪优秀人才支持计划（No.20040248047,60332030, 60502034, 60625103,60703044,2006AA01Z124,NCET-06-0409）
Opened online: 2 April 2008
Accepted by: none
Citation: Guangtao Zhai,Yi Xu,Xiaokang Yang.Unified Artifacts Reduction for Block DCT Compressed Images[OL]. [ 2 April 2008] http://en.paper.edu.cn/en_releasepaper/content/20036
 
 
We propose a unified scheme to alleviate the blocking, ringing and blurring artifacts in block DCT compressed images. The image is decomposed into 2 levels using the over-complete wavelet transform, and the wavelet coefficients are filtered with consideration of local image properties. For the smooth region, the wavelet coefficients are averaged over the range of blocking artifacts’ extension in the over-complete wavelet transform domain on respective levels. For the texture region, only the coefficients on the first level are averaged to prevent over-smooth of the image. And for the edge region, the coefficients are first smoothed and then high-pass filtered to enhance the edges so as to restrain the ringing and blurring artifacts. The inverse transform of the filtered coefficients is performed towards the quality enhanced image. And a quantization constraint is imposed on the final result for better PSNR and visual performance.
Keywords:Image postprocessing, Deblocking, Overcomplete Wavelet Expansion
 
 
 

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