Patent ID: 6061401
Filing Date: 2000-05-09
Classification: H04N

Abstract:
A method, for use in a video signal encoder, for converting an error signal into an encoded signal wherein the error signal represents P.times.Q number of motion compensated differential pixel values between a current frame and a previous frame of a video signal, P and Q being positive integers larger than 2, respectively, comprising the steps of:(a) providing a plurality of error blocks from the error signal, each of the error blocks including M.times.N motion compensated differential pixel values and being overlapped with one or more neighboring error blocks, M and N being positive integers larger than 1, respectively;(b) ciphering a mean value for each of the error blocks based on the P.times.Q number of motion compensated differential pixel values in the error signal;(c) comparing the mean values of the error blocks with one another to select a predetermined number of error blocks in a descending order of the mean values starting from a largest one and providing position data representing positions of selected error blocks, wherein the selected error blocks are not overlapped with one another;(d) transforming the M.times.N motion compensated differential pixel values included in each of the selected error blocks to a set of transform coefficients;(e) converting the set of transform coefficients into a set of quantized transform coefficients; and(f) combining the sets of quantized transform coefficients and the position data of the selected error blocks, to thereby provide the encoded signal.