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Tone mapping for low-light video frame enhancement

  • US 8,890,983 B2
  • Filed: 08/28/2013
  • Issued: 11/18/2014
  • Est. Priority Date: 03/05/2007
  • Status: Active Grant
First Claim
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1. An image processing method comprising;

  • obtaining a first underexposed and sharp image of a scene;

    obtaining a second image relatively well exposed and blurred compared to said first image, nominally of the same scene, wherein said second image is acquired at a different exposure time than said first image;

    scanning across said first and second images to;

    provide a portion of said first image as an input signal to an adaptive filter;

    provide a corresponding portion of said second image as a desired signal to said adaptive filter; and

    calculate filter coefficients for said portion of said images at a given scanning location based on a combination of said input signal, said desired signal and existing filter coefficients for said scanning location; and

    adaptively filter said input signal based on said filter coefficients to produce an output signal and constructing a first filtered image from said output signal, less blurred than said second image.

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