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Saturation processing specification for dynamic range mappings

  • US 10,313,687 B2
  • Filed: 07/16/2015
  • Issued: 06/04/2019
  • Est. Priority Date: 10/10/2014
  • Status: Active Grant
First Claim
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1. A display apparatus comprising a display and an image encoder for encoding two images for a time instant, and for encoding a matrix of pixel colors for the two images, the two images including a first image having a first dynamic range and a second image having a second dynamic range, the first dynamic range image being larger by at least a factor two than the second dynamic range, and the second image having a peak brightness of 100 nit, the image encoder comprising:

  • a specification unit which comprises a color saturation modification apparatus configured to determine linear color differences defined as a linear additive primary color component of an input color minus a luminance of the input color, and to do a multiplication of the linear color differences by a gain, wherein the color saturation modification apparatus is configured to determine the gain from a saturation modification specification function depending on a difference value being defined as a value of a highest one of the linear color differences, and to add the luminance to a result of the multiplication of the linear color differences by the gain, yielding an output color;

    a saturation specification unit configured to specify a desired saturation modification specification function F which encodes gains as a function of the difference value, wherein the desired saturation modification specification function is used by the color saturation modification apparatus to calculate a pixel gain for a highest linear color difference of a pixel being color processed, for effecting a saturation change by multiplying the linear color differences by the pixel gain; and

    a formatter configured to output in an image signal an encoding of an image comprising the matrix of pixel colors, and to output as data the desired saturation modification specification function for display of one of the first image and the second image on the display.

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