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Enhancement of Decompressed Images at Low Bit Rates

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Title: Enhancement of Decompressed Images at Low Bit Rates
Author: Gopinath, Ramesh A.; Lang, Markus; Guo, Haitao; Odegard, Jan E.
Type: Conference Paper
Keywords: image enhancement; wavelet shrinkage; jpeg; image restoration; image compression
Citation: R. A. Gopinath, M. Lang, H. Guo and J. E. Odegard,"Enhancement of Decompressed Images at Low Bit Rates," in SPIE, Mathematical Imaging: Wavelet Applications in Signal Processing and Image Processing II,
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<sup>16</sup> - 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 remarkable well in "deblocking" of DCT compressed images. The method is non-linear, computationally efficient, and spatially adaptive - and has the distint 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.
Date Published: 1994-07-20

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  • ECE Publications [1043 items]
    Publications by Rice University Electrical and Computer Engineering faculty and graduate students
  • DSP Publications [508 items]
    Publications by Rice Faculty and graduate students in digital signal processing.