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Encoding, decoding, and representing high dynamic range images

  • US 8,248,486 B1
  • Filed: 04/17/2012
  • Issued: 08/21/2012
  • Est. Priority Date: 04/15/2011
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • receiving a high dynamic range (HDR) image;

    receiving a tone-mapped (TM) image generated based on the HDR image, the TM image comprising one or more color alterations that are not recoverable from the TM image with a luminance ratio image;

    computing luminance ratio values, on an individual pixel basis, by dividing luminance values of the HDR image with luminance values of the TM image on the individual pixel basis;

    applying the luminance ratio values to the HDR image to create a re-mapped image;

    determining residual values in color channels of a color space based on the re-mapped image and the TM image; and

    outputting the TM image with HDR reconstruction data, the HDR reconstruction data being derived from the luminance ratio values and the residual values.

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