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System and method for detecting tagged material using alpha matting

  • US 7,876,947 B2
  • Filed: 10/02/2008
  • Issued: 01/25/2011
  • Est. Priority Date: 10/10/2007
  • Status: Active Grant
First Claim
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1. A method for computer-aided object classification, soft segmentation and layer extraction in computed tomographic colonography, said method comprising the steps of:

  • providing a contrast enhanced computed tomography (CT) digital image of the colon, said image comprising a plurality of intensities associated with a 3-dimensional (3D) grid of voxels;

    finding a foreground region of voxels with an intensity higher than a pre-defined foreground threshold;

    creating a 3D trimap of said colon wherein said image is segmented into said foreground region, a background region, and an unknown region between the foreground and background;

    starting from said background, extracting successive layers of said unknown region until said foreground region is reached, and classifying each extracted layer as background or foreground; and

    generating a foreground matte, a background matte, and an alpha matte, wherein alpha indicates a mixing ration of foreground and background voxels.

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