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Image matching apparatus, image matching method, computer program and computer-readable storage medium

  • US 7,995,805 B2
  • Filed: 08/29/2007
  • Issued: 08/09/2011
  • Est. Priority Date: 08/30/2006
  • Status: Expired due to Fees
First Claim
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1. An image matching apparatus comprising:

  • a computer-readable memory constructed to store computer-executable process steps; and

    a processor constructed to execute the computer-executable process steps stored in the memory;

    wherein the process steps stored in the memory cause the processor to perform;

    a detector step of detecting, from an input image containing an object to be matched, a region where the object exists;

    an estimation step of estimating a parameter regarding a luminance value based on an image of the region;

    a correction step of correcting the luminance value of the input image based on the parameter; and

    a matching step of matching the corrected input image containing the object to be matched with an image containing a matching object,wherein, said correction step corrects the luminance value of the image by;

    changing a luminance value smaller than a first threshold value to a minimum luminance value,changing a luminance value larger than a second threshold value to a maximum luminance value, andlinearly interpolating a luminance value located between the first threshold value and the second threshold value.

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