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Fast variable run-length coding for embedded progressive wavelet-based image compression
Berghorn, W.; Boskamp, T.; Lang, M.; Peitgen, H.-O.;
Image Processing, IEEE Transactions on
Volume 10,
Issue 12,
Dec. 2001
Page(s):1781
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1790
Abstract:
Run-length coding has attracted much attention in wavelet-based image compression because of its simplicity and potentially low complexity. The main drawback is the inferior RD-performance compared to the state-of-the-art-coder SPIHT. In this paper, we concentrate on the embedded progressive run-length code of Tian and Wells (1996, 1998). We consider significance sequences drawn from the scan in the dominant pass. It turns out that self-similar curves for scanning the dominant pass increase the compression efficiency significantly. This is a consequence of the correlation of direct neighbors in the wavelet domain. This dependence can be better exploited by using groups of coefficients, similar to the SPIHT algorithm. This results in a new and very fast coding algorithm, which shows performance similar to the state-of-the-art coder SPIHT, but with lower complexity and small and fixed memory overhead
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