A lie detection method and system based on an infrared thermal imager
An infrared thermal imaging camera, infrared image technology, applied in the directions of diagnostic recording/measurement, eye testing equipment, medical science, etc., can solve problems such as inability to restrain, and achieve the effect of improving accuracy and reliability
Inactive Publication Date: 2017-06-09
GUANGWEI TECH GRP
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As time goes on after committing the crime, the perpetrator will repeatedly replay various scenes in his mind, thinking about the traces he may leave, and even cannot restrain himself if he doesn't think about it.
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[0020] The method and system for detecting a lie based on an infrared thermal imager according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.
[0021] All objects emit thermal radiation related to their temperature and material properties. The thermal radiation of objects near the ambient temperature is mostly in the infrared band, with a wavelength of about 1 μm to 24 μm. Infrared radiation provides abundant information of the objective world, and in the embodiments of the present invention, this infrared radiation is used to help lie detection.
[0022] The researchers believe the rise in nasal tip temperature is triggered by feelings of anxiety about lying. When people lie, the brain's insular cortex, a type of brain hormone, is activated. The study found that when the activity of the insular cortex is enhanced, the body temperature will rise. In addition, the temperature of the orbital muscles insi...
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The embodiment of the invention discloses an infrared thermal imager-based lie detection method and an infrared thermal imager-based lie detection device. The lie detection method comprises the following steps: obtaining an infrared image of the face of a lie detection object by using an infrared thermal imager; detecting correlation between the heating time of the face and stimulation time according to the infrared image, and obtaining a first correlation coefficient; detecting a change in the sizes of pupils according to the infrared image, and obtaining a second correlation coefficient; obtaining a third correlation coefficient according to the first and second correlation coefficients; determining whether the lie detection object lies or not according to the third correlation coefficient. According to the lie detection method and the lie detection device, subtle face temperature difference change information of the lie detection object is easily recognized in the infrared image, so that the lie detection accuracy is improved; the lie detection object is further judged whether to lie or not by accurately positioning the pupils by virtue of a pupil positioning algorithm and determining the change in the sizes of the pupils, so that the lie detection accuracy and reliability are further improved.
Description
technical field [0001] The invention relates to the technical field of lie detection, in particular to a lie detection method and system based on an infrared thermal imager. Background technique [0002] In 1921, American psychologists and police officers Larson and Keeler developed the first psychological tester (polygraph), which is an instrument that records multiple physiological indicators. It mainly measures the secretion of sweat glands, blood pressure, and respiration. Since it can record the physiological condition of the testee, it can then judge the psychological state of the testee during the test and find out whether the testee has lied during the test. [0003] After more than half a century of development, polygraph technology has been widely used in the investigation, security and confidential departments of Western countries led by the United States. [0004] Existing modern polygraph is usually made up of sensor, main frame and microcomputer. The sensor i...
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IPC IPC(8): A61B5/16A61B3/11
CPCA61B5/164
Inventor 雷述宇
Owner GUANGWEI TECH GRP