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Selective upsampling or refresh of chroma sample values

  • US 10,368,080 B2
  • Filed: 02/21/2017
  • Issued: 07/30/2019
  • Est. Priority Date: 10/21/2016
  • Status: Active Grant
First Claim
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1. A computer system comprising one or more processing units and memory, wherein the computer system implements a video processing tool configured to perform operations comprising:

  • receiving a current picture in a first chroma sampling format that has a first chroma sampling rate, wherein the current picture includes one or more regions;

    for each of the one or more regions, determining whether the region is stationary or non-stationary relative to a previous picture in display order;

    outputting region change metadata that indicates whether the one or more regions, respectively, are stationary or non-stationary relative to the previous picture; and

    converting the current picture to a second chroma sampling format that has a second chroma sampling rate lower than the first chroma sampling rate, including;

    retaining chroma sample values of the current picture in the first chroma sampling format that are at selected positions among positions of the first chroma sampling format, wherein the selected positions vary according to a refresh pattern that facilitates recovery of stationary content at the first chroma sampling rate; and

    discarding chroma sample values of the current picture in the first chroma sampling format that are at other, non-selected positions among the positions of the first chroma sampling format.

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