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Image deblurring using a spatial image prior

  • US 8,390,704 B2
  • Filed: 10/16/2009
  • Issued: 03/05/2013
  • Est. Priority Date: 10/16/2009
  • Status: Expired due to Fees
First Claim
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1. A method for determining a deblurred image, the method implemented at least in part by a data processing system and comprising:

  • a) receiving a sharp image of a scene captured with a short exposure time;

    b) receiving a blurred image of the scene captured with a longer exposure time than the sharp image, wherein the blurred image has a higher level of motion blur than the sharp image;

    c) determining a blur kernel responsive to the sharp image and the blurred image;

    d) determining one or more reference differential images responsive to the sharp image, wherein each pixel of a particular reference differential image is determined by computing a difference between the corresponding pixel in the sharp image and a nearby pixel in the sharp image at a predefined relative position, wherein each differential digital image is associated with a different predefined relative position;

    e) defining an energy function that includes an image differential term that is a function of differences between the reference differential images and a corresponding set of candidate differential images computed for a candidate deblurred image, wherein the candidate differential images for the candidate deblurred image are computed using the predefined relative positions associated with the corresponding reference differential images;

    f) determining a deblurred image responsive to the blurred image and the blur kernel by evaluating candidate deblurred images using the energy function; and

    g) storing the deblurred image in a processor-accessible memory system.

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