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Video signal processing method for improving the picture of dim area

  • US 6,433,838 B1
  • Filed: 01/31/2000
  • Issued: 08/13/2002
  • Est. Priority Date: 04/09/1999
  • Status: Expired due to Term
First Claim
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1. A video signal processing method for improving the picture of a dim area, comprising the following steps:

  • receiving a video input signal including an input luminance signal and input chrominance signals from a signal source;

    normalizing the luminance signal by a predetermined value of a full-scale luminance;

    using the input luminance signal as a corrected luminance signal when the normalized luminance signal is greater than a first predetermined percentage;

    nonlinearly correcting the luminance signal to generate the corrected luminance signal when the normalized luminance signal is less than the first predetermined percentage and greater than a second predetermined percentage;

    linearly correcting the luminance signal to generate the corrected luminance signal when the normalized luminance signal is less than the second predetermined percentage; and

    outputting the corrected luminance signal and the input chrominance signals as the enhanced video signal to a subsequent video processor.

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