Patent ID: 6256349
Filing Date: 2001-07-03
Classification: H04N

Abstract:
A picture signal encoding method for use with an encoding apparatus, said method comprising the steps of:processing an input picture signal for one of intra-picture prediction, forward prediction, backward prediction, and bi-directional prediction in accordance with a control signal to form a predicted picture signal and for processing the predicted picture signal with encoding accompanying real-number calculations for generating encoded data;supplying an encoded signal corresponding to the encoded data to a first transmission buffer;locally decoding the encoded data for generating locally decoded data;determining a difference between the locally decoded data and picture data prevailing prior to performing real-number calculations, said difference being representative of information lost from the input picture signal; andsupplying a difference signal representative of said difference to a second transmission buffer;wherein the encoded signal and said difference signal are usable with a decoding apparatus such that the encoded data is decoded in a manner similar to that performed in the locally decoding step so as to obtain second decoded data with lost information corresponding to the information lost during the encoding method and such that said difference is combined with the second decoded data so as to obtain the picture data.