CREW: Compression with Reversible Embedded Wavelets

Compression with Reversible Embedded Wavelets (CREW) is a uni ed lossless and lossy continuous-tone still image compression system. It is wavelet-based using a \reversible" approximation of one of the best wavelet lters. Reversible wavelets are linear lters with non-linear rounding which implement exact-reconstruction systems with minimal precision integer arithmetic. Wavelet coe cients are encoded in a bit-signi cance embedded order, allowing lossy compression by simply truncating the compressed data. For coding of coe cients, CREW uses a method similar to Shapiro's zerotree, and a completely novel method called Horizon. Horizon coding is a context based coding that takes advantage of the spatial and spectral information available in the wavelet domain. CREW provides state of the art lossless compression of medical images (greater than 8 bits deep), and lossy and lossless compression of 8-bit deep images with a single system. CREW has reasonable software and hardware implem...

• Type: Conference
• Year: 1995
• Where: DCC
• Authors: A. Zandi, James D. Allen, Edward L. Schwartz, Martin P. Boliek
• Keywords: Computer Graphics, DCC 1995, Lossless Compression, Lossy, Wavelet