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Encoding, Decoding, and Representing High Dynamic Range Images

  • US 20150215634A1
  • Filed: 04/02/2015
  • Published: 07/30/2015
  • Est. Priority Date: 04/15/2011
  • Status: Active Grant
First Claim
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1. A method to decode a high dynamic range (HDR) image with a processor, the method comprising:

  • parsing an image file to generate a base image and HDR reconstruction data, wherein the HDR reconstruction data comprises a quantized luma ratio image and one or more sets of quantized residual chroma values;

    extracting quantization parameters from the HDR reconstruction data;

    generating a dequantized luma ratio image and one or more sets of dequantized residual chroma values based on the quantization parameters, the quantized luma ratio image, and the one or more sets of quantized residual chroma values;

    linearizing the dequantized luma ratio image to generate a linearized luma ratio image; and

    generating an output HDR image based on the one or more sets of dequantized residual chroma values, the linearized luma ratio image, and the base image.

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