Coding and decoding digital video signals having duplicate pictures and frames with fields originating from different film source frames

摘要

An apparatus for decoding a coded signal to provide an output video signal, the coded signal being derived by applying predictive coding to an input video signal having a field rate of 60 Hz and being derived from a motion picture film source by 2-3 pull-down, the predictive coding being applied such that frames of the input video signal consisting of fields derived from different frames of the motion picture source are coded using field mode coding, and all other frames of the input video signal are coded using frame mode coding, the coded video signal including a processing mode flag signal indicating a coding mode for each frame, the apparatus comprising: extracting means for extracting the processing mode flag for each frame from the coded signal; and means for applying inverse predictive coding to the coded signal to provide the output video signal, the inverse predictive coding for each frame having the coding mode indicated by the processing mode flag extracted by the extracting means.