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Object detection apparatus and storage medium

  • US 9,245,184 B2
  • Filed: 03/13/2013
  • Issued: 01/26/2016
  • Est. Priority Date: 04/27/2012
  • Status: Active Grant
First Claim
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1. An object detection apparatus, comprising:

  • an image input unit including circuitry configured to receive an image;

    an image feature quantity extraction unit configured to extract a predetermined image feature quantity from the image to generate a feature-quantity extraction image; and

    a symmetry evaluation unit configured to set, for every processing target pixel in the feature-quantity extraction image, a symmetry evaluation area for evaluating symmetry in a first direction in the image in such a manner that the symmetry evaluation area is symmetrical with respect to a central axis that is a predetermined axis in a second direction orthogonal to the first direction, and calculates a weighted value resulting from weighting a value indicating a correlation value based on a distance of a group of pixels included in the symmetry evaluation area and located symmetrical with respect to the central axis from the central axis, the correlation value indicating a correlation between image feature quantities of the group of pixels, while varying a size of the symmetry evaluation area to obtain a symmetry evaluation value indicating a degree of the symmetry in the first directionso as to provide enhanced detection accuracy of a symmetrical object in the image.

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