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Video quality abnormality detection method and apparatus

  • US 6,377,299 B1
  • Filed: 03/24/1999
  • Issued: 04/23/2002
  • Est. Priority Date: 04/01/1998
  • Status: Expired due to Term
First Claim
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1. A video quality abnormality detection method comprising the steps of:

  • dividing a digitized video signal into a plurality of blocks;

    normalizing an original signal with each of divided blocks, as a unit, so as to make a power sum of an AC component constant;

    deriving a power spectrum on the basis of data resulting from the normalizing;

    deriving a fluctuation value from an approximate straight line of the power spectrum and the power spectrum; and

    detecting the video quality abnormality from at least a variance of the signal of the block, coefficients of the approximate straight line, and the fluctuation value of the power spectrum.

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