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System and method for detecting and matching anatomical stuctures using appearance and shape

  • US 20050147303A1
  • Filed: 11/18/2004
  • Published: 07/07/2005
  • Est. Priority Date: 11/19/2003
  • Status: Active Grant
First Claim
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1. A method for detecting an object in an image that contains invalid data regions, the method comprising the steps of:

  • determining a data mask for the image to indicate which pixels in the image are valid;

    representing the data mask as an integral mask in which each pixel has a value corresponding to a total number of valid pixels in the image above and to left of the pixel;

    applying a rectangular feature to the image, the rectangular feature having at least one positive region and one negative region;

    determining the number of pixels in the rectangular feature that are valid using the integral mask;

    approximating a mean intensity value for a region that contains invalid pixels;

    determining a feature value for the rectangular feature by computing a weighted difference between a sum of intensity values in the positive and negative regions of the rectangular feature; and

    using the feature value to determine if an object has been detected.

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