System and method for face detection using candidate image region selection

  • US 6,463,163 B1
  • Filed: 01/11/1999
  • Issued: 10/08/2002
  • Est. Priority Date: 01/11/1999
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of pre-filtering an input image to determine whether said input image includes a target image pattern of interest comprising steps of:

  • receiving said input image;

    correlating said input image with preselected reference data to derive a correlation image, said preselected reference data being representative of said target image pattern of interest, said correlation image having image data indicative of correlations between said input image and said preselected reference data; and

    selecting a candidate region of said input image having a likelihood of containing said target image pattern of interest on a basis of correlating said input image with said preselected reference data, said step of selecting including identifying potential candidate regions of said input image based on detecting a local maximum in said correlation image and screening said potential candidate regions by analyzing a grayscale characteristic of said potential candidate regions, said screening including discarding said potential candidate regions that do not satisfy a predetermined criterion with respect to said grayscale characteristic in order to increase a probability that said selected candidate region contains said target image pattern of interest.

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