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Video/audio signal processing method and video-audio signal processing apparatus

  • US 7,356,082 B1
  • Filed: 11/29/1999
  • Issued: 04/08/2008
  • Est. Priority Date: 11/29/1999
  • Status: Expired due to Fees
First Claim
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1. 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.

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