DocumentCode :
778405
Title :
Reconstruction-optimized lapped orthogonal transforms for robust image transmission
Author :
Hemami, Sheila S.
Author_Institution :
Sch. of Electr. Eng., Cornell Univ., Ithaca, NY, USA
Volume :
6
Issue :
2
fYear :
1996
fDate :
4/1/1996 12:00:00 AM
Firstpage :
168
Lastpage :
181
Abstract :
Wireless transmission of compressed visual information presents new challenges in image coding and reconstruction techniques. Wireless channels do not offer guaranteed transmission, and data loss over such channels can result in catastrophic errors in the decoded visual information. Visual data, however, can be reconstructed using lossy signal processing techniques. To date, reconstruction algorithms have been developed for fixed coding techniques. This paper presents and solves the dual problem-a block-based coding technique, namely a family of lapped orthogonal transforms (LOTs) is designed to maximize the reconstruction performance of a specified reconstruction algorithm. Mean-reconstruction, in which a missing coefficient block is replaced with the average of its available neighbors, is selected for its simplicity and ease of implementation. A reconstruction criterion is defined as the equal distribution of reconstruction errors across all transform coefficients, and a family of LOTs is then designed to meet the reconstruction criterion as well as consider the transform coding gain. Reconstruction capability and coding gain are traded off, and the LOT family consists of transforms that provide increasing reconstruction capability with lower coding gain. The reconstruction-optimized LOT family provides excellent reconstruction capability, and a transform can be selected based on the loss characteristics of the channel, the desired reconstruction performance, and the desired compression
Keywords :
block codes; image coding; image reconstruction; transform coding; visual communication; block-based coding technique; compressed visual information; data loss; decoded visual information; lossy signal processing techniques; mean-reconstruction; reconstruction errors; reconstruction-optimized lapped orthogonal transforms; robust image transmission; transform coefficients; wireless transmission; Algorithm design and analysis; Decoding; Image coding; Image reconstruction; Performance loss; Propagation losses; Reconstruction algorithms; Robustness; Signal processing algorithms; Transform coding;
fLanguage :
English
Journal_Title :
Circuits and Systems for Video Technology, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8215
Type :
jour
DOI :
10.1109/76.488824
Filename :
488824
Link To Document :
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