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Scene-based method for determining focus

  • US 7,171,054 B2
  • Filed: 05/01/2003
  • Issued: 01/30/2007
  • Est. Priority Date: 05/01/2003
  • Status: Expired due to Fees
First Claim
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1. A method of determining focus for an image capture system using scene content within an image, comprising the steps of:

  • a) acquiring, from the image, image data having different focus positions;

    b) dividing the image data into sub-images;

    c) calculating a sharpness value for each sub-image;

    d) calculating an image sharpness value for each focus position using the sub-image sharpness values;

    e) plotting the image sharpness value versus the focus position;

    f) fitting a curve to the plot of the image sharpness values versus the focus position, wherein the curve has a peak sharpness value; and

    g) determining the focus of the image capture system from a point on the curve.

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