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Low threshold face recognition

  • US 8,326,001 B2
  • Filed: 06/29/2010
  • Issued: 12/04/2012
  • Est. Priority Date: 06/29/2010
  • Status: Active Grant
First Claim
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1. A method performed by an image processor, the method comprising:

  • processing a captured image of a face of a user seeking to access a resource by conforming a subset of the captured face image to a reference model, the reference model corresponding to a high information portion of human faces, and the high information portion including eyes and a mouth of a face depicted in a reference image, where the processing of the captured image comprisesdetecting a face within the captured image by identifying the eyes in an upper one third of the captured image and the mouth in a lower third of the captured image, andmatching the eyes of the detected face with the eyes of the face depicted in the reference image to obtain a normalized image of the detected face;

    comparing the processed image to at least one target profile corresponding to a user associated with the resource, wherein the comparing of the processed image comprisesobtaining a difference image of the detected face by subtracting the normalized image of the detected face from a normalized image of a target face associated with a target profile, andcalculating scores of respective pixels of the difference image based on a weight defined according to proximity of the respective pixels to high information portions of the human faces, wherein the weight decreases from a maximum weight value at a mouth-level to a minimum weight value at an eyes-line; and

    selectively recognizing the user seeking access to the resource based on a result of the comparing.

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