Appendix G . Appendix I . This section contains extra material added by the author from time to time. These documents are intended to to add new material, and to shed new light on material already included in the book. The concept of correlation is basic to image and audio compression.
Image compression is achieved by decorrelating the pixels of an image.
In statistics, one is normally concerned with calculating the correlation between random variables, but rarely with decorrelations. However, there is a little-known technique, the Mahalanobis transformation, that is used to decorrelate random variable. Quadtrees and octrees are discussed in Section 4.27 of the book. Last Updated 14 Apr, 2001.