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Proceedings Paper

Edge-protection nonlinear filters for removing compression block artifacts and noise
Author(s): Daben Liu; Sos S. Agaian; Joseph P. Noonan
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Paper Abstract

JPEG is perhaps the most commonly used still-image standard due to its good compression rate, flexibility in choosing image quality and fast algorithm for implementation. In JPEG, the DCT is used for 8 by 8 block transforms. However the notorious block artifacts caused by the DCT are of great concern. In this article, we focus on the DCT and try different filters to smooth the annoying block boundaries which are very visible under a high compression rate. A new nonlinear filter is proposed which outperforms which are very visible under a high compression rate. A new nonlinear filter is proposed which outperforms existing techniques. The results are demonstrated for images with a comparison of mean-square-errors. For a general application, the new filter is used to cancel gaussian noise added to an image and the performance is compared with that of other commonly used filters.

Paper Details

Date Published: 4 April 1997
PDF: 8 pages
Proc. SPIE 3026, Nonlinear Image Processing VIII, (4 April 1997); doi: 10.1117/12.271132
Show Author Affiliations
Daben Liu, Tufts Univ. (United States)
Sos S. Agaian, Tufts Univ. (United States)
Joseph P. Noonan, Tufts Univ. (United States)


Published in SPIE Proceedings Vol. 3026:
Nonlinear Image Processing VIII
Edward R. Dougherty; Jaakko T. Astola, Editor(s)

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