Patent ID: 6333949
Filing Date: 2001-12-25
Classification: H04N

Abstract:
A video coding apparatus for performing a predictive coding of digital video input signals, comprising:resolution determination means for selecting a picture resolution to be used in coding a source picture, the picture resolution being either a low resolution or a high resolution;coding means for coding a prediction error signal representing differences between the source picture and a prediction picture, the prediction error signal having been calculated in the picture resolution selected by said resolution determination means;decoding means for reproducing the prediction error signal by decoding the coded prediction error signal;resolution conversion means for converting the reproduced prediction error signal up to the high resolution, if the reproduced prediction error signal provided by said decoding means is of the low resolution;decoded picture generation means for constructing a decoded picture from the prediction picture and the reproduced prediction error signal converted to the high resolution by said resolution conversion means;decoded picture storage means for storing the decoded picture constructed by said decoded picture generation means; andprediction picture generation means for producing the prediction picture from the source picture and the decoded picture stored in said decoded picture storage means.