Patent ID: 6473459
Filing Date: 2002-10-29
Classification: H04N

Abstract:
A scene change detector for detecting scene changes from compressed video data, comprising:a means for video-signal-demultiplexing the compressed video data to obtain video-signal demultiplexed information; a means for extracting at least predictive-coded mode information, motion vectors, and coded transformed coefficients from the video-signal-demultiplexed information obtained by the means for video-signal-demultiplexing; and a means for judging an abrupt scene change by counting a number of blocks each having a forward prediction mode and a backward prediction mode by using at least the predictive-coded-mode information and comparing the number of blocks with a predetermined threshold; and a means for judging candidates of dissolve and wipe in remaining video data, which is not judged as the abrupt scene change, by comparing at least motion characteristics calculated from values of the motion vectors and predictive-coded picture characteristics calculated from the coded transformed coefficients with another predetermined threshold.