DCT compression

DCT compression (Discrete cosine transform) is a compression technique used for images and audio. It is used in JPEG and MP3, where it provides lossy compression (meaning that some detail is lost).

Links
Cosine Transform (NASA)]
 * Wikipedia article: Discrete cosine transform
 * [http://vision.arc.nasa.gov/publications/mathjournal94.pdf Image Compression Using the Discrete
 * Image Compression and the Discrete Cosine Transform
 * Description of DCT as used in JPEG