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Methods and systems for color preservation with a color-modulated backlight

  • US 8,416,179 B2
  • Filed: 07/10/2008
  • Issued: 04/09/2013
  • Est. Priority Date: 07/10/2008
  • Status: Active Grant
First Claim
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1. A tangible, non-transitory, computer-readable medium comprising computer-readable instructions for instructing a processor to implement a method for adjusting image code values for backlight variations, said method comprising:

  • a) determining a first backlight intensity value for a first color channel of a backlight element corresponding to a pixel;

    b) determining a first ideal gain value to compensate for said first backlight intensity value in said first color channel;

    c) determining a first gain equivalent value to compensate for said first backlight intensity value in said first color channel;

    d) calculating a first gain reduction factor based on said first ideal gain value and said first gain equivalent value for said first color channel;

    e) determining a second backlight intensity value for a second color channel of said pixel;

    f) determining a second ideal gain value to compensate for said second backlight intensity value in said second color channel;

    g) determining a second gain equivalent value to compensate for said second backlight intensity value in said second color channel;

    h) calculating a second gain reduction factor based on said second ideal gain value and said second gain equivalent value for said second color channel;

    i) selecting one of said first gain reduction factor related to said first color channel and said second gain reduction factor related to said second color channel as a selected gain reduction factor to be applied to both said first color channel and said second color channel, said selecting being based on color preservation; and

    j) determining an adjusted image color channel code value using an original image code value for a color channel of said pixel, said ideal gain and said selected gain reduction factor.

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