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Content-adaptive adjustments to tone mapping operations for high dynamic range content

  • US 10,176,561 B2
  • Filed: 01/27/2017
  • Issued: 01/08/2019
  • Est. Priority Date: 01/27/2017
  • 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 playback system that is to be connected to a target display device having a brightness level that is dynamically controllable by the playback system, and wherein the playback system includes:

  • decision logic implemented by software executable on one or more central processing units, among the one or more processing units, by software controlling special-purpose hardware, or by special-purpose hardware, wherein the decision logic is configured to;

    receive histogram information for sample values of a picture of high dynamic range (“

    HDR”

    ) content, wherein the histogram information for the sample values of the picture of HDR content is organized as multiple bins, each of the multiple bins having a count of the sample values of the picture of HDR content within that bin, and wherein each of the multiple bins represents a range of possible sample values between a minimum possible sample value for the bin and a maximum possible sample value for the bin;

    set a tone mapping function based at least in part on the histogram information for the sample values of the picture of HDR content;

    send, to the target display device, a control signal that indicates a brightness level of the target display device for display of the picture of HDR content; and

    after tone mapping, send, to the target display device, the sample values of the picture of HDR content; and

    a tone mapper configured to, as part of rendering the picture of HDR content for output to the target display device, apply tone mapping to input values for the sample values of the picture of HDR content, according to the tone mapping function, and thereby produce output values for the sample values of the picture of HDR content.

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