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Signal Processing— Non-Invasive Polygraph TechnologyOrdinarily, conventional polygraph techniques involve a subject who is attached to various sensors for measurement of heart and breathing rates, and perhaps other body parameters such as skin characteristics and body temperature. While this technology has provided a generally effective and helpful tool, the legal system has been slow to accept it because of the recognized susceptibility to both false positive and false negative results. A drawback to this technology is the need to attach sensors to the subject prior to the examination. This could contribute a high incidence of false positives due to the subject's nervousness caused by being physically attached to the equipment. DGI is developing technology that will unobtrusively and non-invasively test a subject for the purpose of determining whether he/she is being truthful and/or is under stress. The technology utilizes a series of laser or infrared pulses that are directed to the human subject. The reflection or scatter of these pulses are received and processed to determine various physiological characteristics exhibited by the subject. Patent applications for this technology have been submitted with the patent offices of the United States, Canada and the United Kingdom. Decisions are still pending regarding the patent applications in the United States and Canada, however, the United Kingdom patent office has granted DGI a patent for “Non-Invasive Polygraph Technology Based on Optical Analysis.” |
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