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STAIN DETECTION

  • US 20130259301A1
  • Filed: 03/30/2012
  • Published: 10/03/2013
  • Est. Priority Date: 03/30/2012
  • Status: Active Grant
First Claim
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1. A method of detecting staining on a media item, the method comprising:

  • receiving an image of the media item, where the image comprises a plurality of pixels having different intensity values within a range of intensity values;

    using pixels from the image having intensity values within a central portion of the range of intensity values to create a centrally-weighted image;

    applying a threshold to each pixel in the centrally-weighted image to transform each pixel to a binary value thereby creating an evaluation image comprising a plurality of pixels, each having one of two possible values;

    calculating a difference image between a binary reference image and the evaluation image by comparing a pixel in the evaluation image with a pixel in the binary reference image at a corresponding spatial location, so that the difference image includes (i) a stain pixel at each spatial location in which a pixel in the evaluation image has a low intensity pixel and the corresponding pixel in the binary reference image has a high intensity pixel, and (ii) a non-stain pixel at all other spatial locations;

    indicating that the media item is stained in the event that the difference image meets a staining criterion.

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