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Methods and systems for backlight modulation and brightness preservation

  • US 8,345,038 B2
  • Filed: 10/30/2007
  • Issued: 01/01/2013
  • Est. Priority Date: 10/30/2007
  • Status: Expired due to Fees
First Claim
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1. A method for adjusting image characteristics, said method comprising:

  • a) creating an image histogram for an image, said histogram comprising a plurality of bins;

    b) selecting a subset of backlight illumination levels from a set of possible backlight illumination levels, said selecting being dependent on characteristics of said image;

    c) calculating a display reference model using a first pre-computed integer representation of a gamma power function;

    d) calculating a display target model using a second pre-computed integer representation of a gamma power function;

    e) determining a distortion weight for each histogram bin at each selected backlight illumination level in said subset using said display reference model and said display target model;

    f) determining backlight-specific frame distortion values by multiplying said distortion weights by their corresponding histogram bin counts for each of said selected backlight illumination levels; and

    g) illuminating a backlight at a selected backlight illumination level from said subset based on said backlight-specific frame distortion values.

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