System and method using thermal image analysis and slope threshold classification for polygraph testing
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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Abstract
Thermal image data of at least a region of a face of a person is provided. The thermal image data is transformed to blood flow rate data which includes a slope representative of the change of blood flow rate over time. The slope is compared to a slope threshold to determine a physiological state of the person. For example, it may be determined whether the person is deceptive or non-deceptive, e.g., deceptive with respect to an elicited response from the person.
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Citations
31 Claims
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1. A method for use in detecting deception of a person, the method comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for use in detecting deception of a person, the system comprising:
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a thermal infrared image device operable to provide thermal image data of at least a region of a face of a person; and
a computing apparatus operable to;
transform 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;
provide 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
compare the slope representative of change of blood flow rate over time for a person to the slope threshold to determine the person as deceptive or non-deceptive. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 19, 20, 21, 22, 23, 25, 26, 27, 29, 30, 31)
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18. A polygraph method for use in determining whether a person is being deceptive or non-deceptive with respect to a response elicited from the person, the method comprising:
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capturing thermal image data from at least one region of the face of the person during at least the elicited response;
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 in the at least one region of the face;
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 for the person to the slope threshold to classify the person'"'"'s elicited response as deceptive or non-deceptive.
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24. A method for use in determining a physiological state of a person, the method comprising:
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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 first physiological state of a person and change of blood flow rate over time for a second physiological state of a person; and
comparing the slope representative of change of blood flow rate over time to the slope threshold to determine whether the person is in the first or second physiological state.
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28. A system for use in determining a physiological state of a person, the system comprising:
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a thermal infrared image device operable to provide thermal image data of at least a region of a face of a person; and
a computing apparatus operable to;
transform 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;
provide a slope threshold representative of a demarcation between change of blood flow rate over time for a first physiological state of a person and change of blood flow rate over time for a second physiological state of a person; and
compare the slope representative of change of blood flow rate over time to the slope threshold to determine whether the person is in the first or second physiological state.
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Specification