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Color characterization of projectors

  • US 7,148,902 B2
  • Filed: 10/01/2004
  • Issued: 12/12/2006
  • Est. Priority Date: 10/01/2004
  • Status: Active Grant
First Claim
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1. A method for transforming a device-dependent color value in a device-dependent color space of a display device to a perceptually linear color value in a perceptually linear color space, the method comprising:

  • a first determining step of determining a first color value in a perceptually linear color space, by applying a matrix model to the device-dependent color value to obtain an XYZ color value in an XYZ color space, the matrix model applying a tone curve correction and a tristimulus matrix to the device-dependent color value, and by converting the XYZ color value into the first color value using a color space converter;

    a second determining step of determining a difference value in the perceptually linear color space, wherein the difference value is determined by applying a difference model to the device-dependent color value, and wherein the difference model models deviation of the matrix model from actual measurements of the display device; and

    an adding step of adding the difference value and the first color value to obtain the perceptually linear color value.

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