Fast scaled-DCT algorithm
Ephraim Feig · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1990
The Discrete Cosine Transform (DCT) followed by scaling and quantiza.tion is an mlportant operation in image processing. Because of the scaling, the DCT itself need not he computed, but rather a scalar mu]tiple of the DCT might do, with appropriate compensation incorporated into the scaling. We present a fast method for computing such scaled output of the 2-dimensional DCT on 8 x 8 points. We also present a similar algorithm for the inverse scaled DCT.