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Improved reconstruction of DPCM-coded pictures

A new scheme for the reconstruction of DPCM-coded signals is presented. In this scheme, instead of assigning one representative level to the prediction error whenever it is in a range determined by the decision levels of a DPCM quantizer, surrounding local picture structure is used to improve the reconstruction. No extra transmission is required. Mean-absolute-reconstruction error is decreased by over 20 percent, and the picture quality is significantly improved in flat, as well as high, detailed areas of still pictures and sequences of pictures containing motion.