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Local feature amount calculating device, method of calculating local feature amount, corresponding point searching apparatus, and method of searching corresponding point

  • US 8,774,508 B2
  • Filed: 02/27/2012
  • Issued: 07/08/2014
  • Est. Priority Date: 02/27/2012
  • Status: Active Grant
First Claim
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1. A local feature amount calculating device that calculates a local feature amount of an image, the local feature amount calculating device comprising:

  • a feature point near-field region extracting unit that extracts a feature point and a near-field region that is set near the feature point from the image;

    a direction strength calculating unit that calculates a direction of each pixel located within the near-field region and a strength of the direction;

    a main axis direction detecting unit that detects a main axis direction of the near-field region; and

    a local feature amount calculating unit that acquires a local feature amount of the feature point by giving a vote of the strength of the direction of each pixel, which is calculated by the direction strength calculating unit, to a vote cell to which the pixel belongs out of vote cells of a rotated vote cell pattern that is acquired by rotating a reference vote cell pattern by an angle corresponding to the main axis direction along a corrected direction that is acquired by correcting the direction of the pixel that is calculated by the direction strength calculating unit in accordance with the main axis direction.

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