early chapters set the mathematics involved in basic compression techniques, including lossless and lossy compression as well as the basics of information theory that lay the groundwork for a common form of compression. Introduction to Data Compression begins with lossless compression scheme, which does not lose information during compression / decompression process. In addition, the authors take a lossless compression for images. For lossy compression, Sayood discuss schemes that use quantization, where different values are compressed in some way. Many compression schemes include examples of images and sound files, but the book also considers a variety of video schemes.