Enhancement of decompressed images at low bit rates

Ramesh A. Gopinath; Markus Lang; Haitao Guo; Jan Erik Odegard

doi:10.1117/12.188786

11 October 1994 Enhancement of decompressed images at low bit rates

Ramesh A. Gopinath, Markus Lang, Haitao Guo, Jan Erik Odegard

Author Affiliations +

Proceedings Volume 2303, Wavelet Applications in Signal and Image Processing II; (1994) https://doi.org/10.1117/12.188786
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

Transform coding at low bit rates introduces artifacts associated with the basis functions of the transform. For example, decompressed images based on the DCT (discrete cosine transform)-- like JPEG--exhibit blocking artifacts at low bit rates. This paper proposes a post-processing scheme to enhance decompressed images that is potentially applicable in several situations. In particular, the method works remarkably well in `deblocking' of DCT compressed images. The method is non-linear, computationally efficient, and spatially adaptive--and has the distinct feature that it removes artifacts while yet retaining sharp features in the images. An important implication of this result is that images coded using the JPEG standard can be efficiently post-processed to give significantly improved visual quality in the images.

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Ramesh A. Gopinath, Markus Lang, Haitao Guo, and Jan Erik Odegard "Enhancement of decompressed images at low bit rates", Proc. SPIE 2303, Wavelet Applications in Signal and Image Processing II, (11 October 1994); https://doi.org/10.1117/12.188786

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