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Method and apparatus for backlight compensation of an image

  • US 8,334,925 B2
  • Filed: 09/03/2010
  • Issued: 12/18/2012
  • Est. Priority Date: 05/13/2008
  • Status: Active Grant
First Claim
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1. A method for backlight compensation of an image, comprising:

  • generating an image histogram of an image to be processed;

    judging whether the image to be processed requires backlight compensation according to the image histogram;

    if the image to be processed requires the backlight compensation, determining a first luminance boundary value A used for performing the backlight compensation and a second luminance boundary value C used for performing positive or negative backlight compensation; and

    performing backlight compensation for the image to be processed according to the first luminance boundary value A and the second luminance boundary value C;

    wherein judging whether the image to be processed requires the backlight compensation includes;

    obtaining a luminance level of L1 a pixel point corresponding to a crest value of a highest peak with a maximum crest luminance and a luminance level L2 of a pixel point corresponding to a crest value of a second highest peak whose crest luminance level is lower than an average luminance of the image histogram, anddetermining that the image to be processed requires the backlight compensation if L1

    L2>

    K, wherein K is a fixed luminance difference and K>

    0.

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