COMPRESSED DOMAIN PROCESSING OF JPEG-ENCODED IMAGES

This paper addresses the problem of processing motion-JPEG video data in the compressed domain, The operations covered are those where a pix el in the output image is an arbitrary linear combination of pixels in the input image, which includes convolution, scaling, rotation, trans lation, morphing, de-interlacing, image composition, and transcoding, This paper further develops an approximation technique called condensa tion to improve performance and evaluates condensations in terms of pr ocessing speed and image quality, Using condensation, motion-JPEG vide o can be processed at near real-time rates on current generation works tations. (C) 1996 Academic Press Limited