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Method and apparatus for extended depth-of-field image restoration

  • US 8,131,097 B2
  • Filed: 05/28/2008
  • Issued: 03/06/2012
  • Est. Priority Date: 05/28/2008
  • Status: Active Grant
First Claim
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1. A method of processing a captured image comprising:

  • receiving a captured image;

    dividing the captured image into a plurality of tiles;

    reading at least one prestored eigen-kernel from memory;

    reading at least one scalar value from memory; and

    for each pixel in the tile;

    reading image data in an M×

    M window, where M is a number of pixels;

    determining a mean of the windowed data;

    estimating a variance of noise at a current pixel using the mean and a noise model;

    estimating a variance of the image data in the window;

    estimating a variance of an original image taking into account degrading blur, noise, and the variance of the image data; and

    determining a signal-to-noise ratio at the current pixel, wherein estimating a variance of an original image is performed according to;


    σ

    x2=(σ

    y2

    σ

    n2)/φ

    (h),wherein φ

    (h) is a scalar value representing a strength of the point spread function, σ

    n2 is the estimated variance of noise, σ

    y2 is the estimated variance of the image data, and σ

    x2 is the estimated variance of the original image.

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