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Systems and methods for local tone mapping

  • US 9,741,099 B2
  • Filed: 08/10/2015
  • Issued: 08/22/2017
  • Est. Priority Date: 05/31/2012
  • Status: Active Grant
First Claim
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1. An electronic device comprising:

  • an electronic display configured to display images of a first bit depth;

    an imaging device comprising an image sensor configured to obtain image data of a higher bit depth than the first bit depth; and

    an image signal processor configured to process the image data, wherein the image signal processor comprises;

    local tone mapping logic configured to apply a spatially varying local tone curve to a pixel of the image data to preserve local contrast when displayed on the display, wherein the local tone mapping logic is configured to smooth the local tone curve applied to the pixel unless an intensity difference between the pixel and one or more other nearby pixels exceeds a threshold indicative of an edge within the image data, wherein the local tone mapping logic is configured to apply the spatially varying local tone curve to the pixel by computing a gain based at least in part on an input luminance associated with the pixel and an output luminance obtained by a spatially varying lookup table.

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