ABSTRACT
The discrete cosine transform (DCT) and discrete sine transform (DST) are members of a family of sinusoidal unitary transforms. They have found applications in digital signal and image processing and particularly in transform coding systems for data compression/decompression. Among the various versions of DCT, types II and III have received much attention in digital signal processing. Besides being real, orthogonal, and separable, its properties are relevant to data compression and fast algorithms for its computation have proved to be of practical value. Recently, DCT has been employed as the main processing tool for data compression/decompression in international image and video coding standards [31]. An alternative transform used in transform coding systems is DST. In fact, the alternate use of modified forms of DST and DCT has been adopted in the international audio coding standards MPEG-1 and MPEG-2 (Moving Picture Experts Group) [31].
