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Proceedings Paper

Implementation of compression with reversible embedded wavelets
Author(s): Edward L. Schwartz; Ahmad Zandi; Martin P. Boliek
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Paper Abstract

Compression with reversible embedded wavelets (CREW) is a unified lossless and lossy continuous-tone still image compression system. 'Reversible' wavelets are nonlinear filters which implement exact-reconstruction systems with minimal precision integer arithmetic. Wavelet coefficients are encoded in a bit-significance embedded order, allowing lossy compression by truncating the compressed data. Lossless coding of wavelet coefficients is unique to CREW. In fact, most of the coded data is created by the lessor significant bits of the coefficients. CREW's context-based coding, called Horizon coding, takes advantage of the spatial and spectral information available in the wavelet domain and adapts well to the lessor significant bits. In applications where the size of an image is large, it is desirable to perform compression in one pass using far less workspace memory than the size of the image. A buffering scheme which allows a one-pass implementation with reasonable memory is described.

Paper Details

Date Published: 22 August 1995
PDF: 12 pages
Proc. SPIE 2564, Applications of Digital Image Processing XVIII, (22 August 1995); doi: 10.1117/12.217408
Show Author Affiliations
Edward L. Schwartz, Ricoh California Research Ctr. (United States)
Ahmad Zandi, Ricoh California Research Ctr. (United States)
Martin P. Boliek, Ricoh California Research Ctr. (United States)


Published in SPIE Proceedings Vol. 2564:
Applications of Digital Image Processing XVIII
Andrew G. Tescher, Editor(s)

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