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System and method using thermal image analysis and slope threshold classification for polygraph testing

  • US 7,111,980 B2
  • Filed: 11/13/2001
  • Issued: 09/26/2006
  • Est. Priority Date: 04/19/2001
  • Status: Active Grant
First Claim
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1. A method for use in detecting deception of a person, the method comprising:

  • providing thermal image data of at least a region of a face of a person;

    transforming the thermal image data to blood flow rate data, wherein the blood flow rate data comprises a slope representative of change of blood flow rate over time;

    providing a slope threshold representative of a demarcation between change of blood flow rate over time for a deceptive person and change of blood flow rate over time for a non-deceptive person; and

    comparing the slope representative of change of blood flow rate over time to the slope threshold to determine whether the person is deceptive or non-deceptive.

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