Patent ID: 7356082

Claim:
A video/audio signal processing method for processing supplied compression-encoded video/audio signals, said method comprising the steps of: parsing said video/audio signals in a compressed domain of the video/audio signals and extracting therefrom motion vectors of said video/audio signals, DCT-coefficients and macroblock-type; using said extracted motion vectors, DCT-coefficients and macroblock-type to extract at least one compressed domain feature point representing characteristics of said video/audio signals in a compressed domain of said video/audio signals; performing motion estimation of the extracted feature points; tracking the feature points associated with a motion vector through a pre-set number of frames of said video/audio signals; and calculating and extracting the block signature for the current block of high relevance as selected in a discrete-cosine-transform domain using part or all of DCT-coefficients in a block, wherein said extraction step includes a step of calculating the block relevance metric of all blocks according to said DCT-coefficients in the current frame to determine a block having high relevance as a candidate of the feature point selected as the next feature point based on said motion estimation step, wherein said extraction step includes a step of performing inverse transform of transforming said compressed domain only for the blocks of high relevance selected by said metric calculating step and of performing motion compensation for a prediction coded macroblock or a bidirectionally prediction coded macroblock.