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Detection of features in images

  • US 7,519,206 B2
  • Filed: 11/19/2001
  • Issued: 04/14/2009
  • Est. Priority Date: 11/22/2000
  • Status: Expired due to Fees
First Claim
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1. A method of detecting features-of interest in an image, comprising:

  • using a processor to perform steps of;

    processing the image to make an intensity independent representation of an image intensity profile;

    comparing the intensity independent representation with an intensity independent shape model for predefined features of interest by;

    convolving the intensity independent representation with a quadrature filter to derive the phase and amplitude of a pair of odd and even components of the profile in the spatial or spatio temporal frequency domains;

    deriving from a difference between the components a measure of one of the feature symmetry or asymmetry along the profile,deriving from the components a measure of the local amplitude along the profile; and

    defining areas of the image satisfying a predefined constraint on the value of said one of the feature symmetry or asymmetry as satisfying the shape model and thus belonging to an image feature; and

    storing for the profile a label comprising said measures.

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