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Adaptive lossy LZW algorithm for palettised image compression

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2 Author(s)
Chiang, S.W. ; Dept. of Electron. Eng., City Univ. of Hong Kong, Kowloon ; Po, L.M.

An adaptive lossy LZW algorithm is proposed for palettised image compression, that is a generalised algorithm of the conventional lossless LZW algorithm. The new algorithm employs an adaptive thresholding mechanism with human visual characteristics to constrain the distortion. With this distortion control, the compression efficiency is increased by ~40% for natural colour images, while maintaining good subjective quality on the reconstructed image. In addition, the encoded image file format is compatible with the original GIF decoder

Published in:

Electronics Letters  (Volume:33 ,  Issue: 10 )

Date of Publication:

8 May 1997

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