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Wavelet-Based Post-Processing of Low Bit Rate Transform Coded Images

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Title: Wavelet-Based Post-Processing of Low Bit Rate Transform Coded Images
Author: Gopinath, Ramesh A.; Lang, Markus; Guo, Haitao; Odegard, Jan E.
Type: Conference Paper
Keywords: Temporary
Citation: R. A. Gopinath, M. Lang, H. Guo and J. E. Odegard,"Wavelet-Based Post-Processing of Low Bit Rate Transform Coded Images," in IEEE International Conference on Image Processing,
Abstract: In this paper we propose a novel method based on wavelet thresholding for enhancement of decompressed transform coded images. Transform coding at low bit rates typically introduces artifacts associated witht he basis functions of the transform. In particular, the method works remarkably well in "deblocking" of DCT compressed images. The method is nonlinear, computationally efficient, and spatially adaptive and has the distinct feature that it removes artifacts yet retain sharp features in the images. An important implication of this result is that iamges coded using the JPEG standard can efficiently be postprocessed to give significantly improved visual quality in the images. The algorithm can use a conventional JPEG encoder and decoder for which VLSI chips are available.
Date Published: 1994-11-01

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  • ECE Publications [1046 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.