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 pixel in the output image is an arbitrary linear combination of pixels in the input image, which includes convolution, scaling, rotation, translation, morphing, de-interlacing, image composition, and transcoding, This paper further develops an approximation technique called condensation to improve performance and evaluates condensations in terms of processing speed and image quality, Using condensation, motion-JPEG video can be processed at near real-time rates on current generation workstations. (C) 1996 Academic Press Limited