System and method using thermal image analysis and slope threshold classification for polygraph testing
AssigneeHoneywell International Inc.
InventorsIoannis Pavlidis, James A. Levine
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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.
Claims31
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.
A system for use in detecting deception of a person, the system comprising:
- 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.
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:
- 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.
A method for use in determining a physiological state 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 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.
A system for use in determining a physiological state of a person, the system comprising:
- 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.
Dependencies are inferred from the claim text.