Methods and Standards for Lossless Compression
Lossless compression refers to compression methods for which the original uncompressed data set can be recovered exactly from the compressed stream. The need for lossless compression arises from the fact that many applications, such as the compression of digitized medical data, require that no loss be introduced from the compression method. Bitonal image transmission via a facsimile device also imposes such requirements. In recent years, several compression standards have been developed for the lossless compression of such images. We discuss these standards later in this chapter. In general, even when lossy compression is allowed, the overall compression scheme may be a combination of a lossy compression process followed by a lossless compression process as depicted in Figure 1.5. Various image, video, and audio compression standards follow this model, and several of the lossless compression schemes used in these standards are described in this chapter.
KeywordsCompression Ratio Input Symbol Lossless Compression Arithmetic Code Compression Standard
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