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Signaling bit depth values for 3D color prediction for color gamut scalability

  • US 10,448,029 B2
  • Filed: 04/16/2015
  • Issued: 10/15/2019
  • Est. Priority Date: 04/17/2014
  • Status: Active Grant
First Claim
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1. A method of decoding video data, the method comprising:

  • receiving a first syntax element indicating a first bit depth for an input luma component of a three-dimensional (3D) lookup table for color gamut scalability, the first bit depth being constrained to be equal to a bit depth of a luma component of a reference layer picture in a reference layer of the video data, and wherein the first bit depth is constrained to be not different than the bit depth of the luma component of the reference layer picture in the reference layer of the video data;

    receiving a second syntax element indicating a second bit depth for input chroma components of the 3D lookup table, the second bit depth being constrained to be equal to a bit depth of chroma components of the reference layer picture, and wherein the second bit depth is constrained to be not different than the bit depth of chroma components of the reference layer picture;

    applying the 3D lookup table directly to the luma component and the chroma components of the reference layer picture to convert the luma component and the chroma components of the reference layer picture from a first color gamut for the reference layer of the video data to a second color gamut for an enhancement layer of the video data, wherein applying the 3D lookup table directly to the luma component and the chroma components of the reference layer picture comprises using the luma component and the chroma components of the reference layer picture as input of the 3D lookup table having bit depths equal to the first bit depth for the input luma component and the second bit depth for the input chroma components, respectively, of the 3D lookup table;

    generating an inter-layer reference picture for an enhancement layer picture in the enhancement layer of the video data based on the converted luma component and the converted chroma components of the reference layer picture; and

    decoding video blocks of the enhancement layer picture based on the inter-layer reference picture generated using the 3D lookup table.

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