Journal ArticleDOI
Improved decoder for transform coding with application to the JPEG baseline system
S.-W. Wu,Allen Gersho +1 more
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TLDR
An iterative algorithm for designing a set of locally optimal codebooks is developed and results demonstrate that this improved decoding technique can be applied in the JPEG baseline system to decode enhanced quality pictures from the bit stream generated by the standard encoding scheme.Abstract:
Transform coding, a simple yet efficient image coding technique, has been adopted by the Joint Photographic Experts Group (JPEG) as the basis for an emerging coding standard for compression of still images. However, for any given transform encoder, the conventional inverse transform decoder is suboptimal. Better performance can be obtained by a nonlinear interpolative decoder that performs table lookups to reconstruct the image blocks from the code indexes. Each received code index of an image block addresses a particular codebook to fetch a component vector. The image block can be reconstructed as the sum of the component vectors for that block. An iterative algorithm for designing a set of locally optimal codebooks is developed. Computer simulation results demonstrate that this improved decoding technique can be applied in the JPEG baseline system to decode enhanced quality pictures from the bit stream generated by the standard encoding scheme. >read more
Citations
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Journal ArticleDOI
Improved image decompression for reduced transform coding artifacts
TL;DR: The proposed image decompression provides a reconstructed image with reduced visibility of transform coding artifacts and superior perceived quality.
Journal ArticleDOI
Review of Postprocessing Techniques for Compression Artifact Removal
Mei-Yin Shen,C.-C. Jay Kuo +1 more
TL;DR: A review and analysis of recent developments in postprocessing techniques, including various types of compression artifacts, two types of postprocessing algorithms based on image enhancement and restoration principles and current bottlenecks are addressed.
Journal ArticleDOI
Bayesian resolution enhancement of compressed video
TL;DR: This paper considers the impact of video compression on the super-resolution task, and utilizes the Bayesian framework to incorporate information from Hybrid motion-compensation and transform coding schemes to fuse thesuper-resolution and post-processing problems.
Journal ArticleDOI
A sequence-based approximate MMSE decoder for source coding over noisy channels using discrete hidden Markov models
David J. Miller,Moonseo Park +1 more
TL;DR: For a Markovian sequence of encoder-produced symbols and a discrete memoryless channel, the optimal decoder computes expected values based on a discrete hidden Markov model, using the wellknown forward/backward (F/B) algorithm.
Proceedings ArticleDOI
Wavelet-based post-processing of low bit rate transform coded images
TL;DR: This work proposes a novel method based on wavelet thresholding for enhancement of decompressed transform coded images that works remarkably well in "deblocking" of DCT compressed images.
References
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