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http://dx.doi.org/10.5391/JKIIS.2014.24.1.022

A Postfiltering Algorithm for Enhancement in Block-based DCT Compressed Images  

Kim, Yong-Hun (Department of Aviation Information and Comm. Engineering, Kyungwoon University)
Jeong, Jong-Hyeog (Department of Aviation Information and Comm. Engineering, Kyungwoon University)
Publication Information
Journal of the Korean Institute of Intelligent Systems / v.24, no.1, 2014 , pp. 22-27 More about this Journal
Abstract
Blocking and ringing artifacts continue to be the most serious defects that occur in images and video streams compressed to low bit rates using block-based discrete cosine transform(DCT) compression standards. These artifacts contain the high frequency components near the block and the edge boundaries. Usually the lowpass filter can remove them. However, simple lowpass filter results into blur by removing important information such as edges at the same time. To overcome these problems, we propose a novel postfiltering algorithm that calculate the weight value based on the intensity similarity in the neighboring pixels and multiply this weight to the Gaussian lowpass filter coefficient. Experimental results show that the proposed technique provides satisfactory performance in both objective and subjective image quality.
Keywords
Post-Filtering; Blocking Artifact; Ringing Artifact; Signal Adaptive Filter; Image Enhancement;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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