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Expanding private authentication manner and the private authentication device null laser luminous flux which utilize the fingertip blood current measurement
Expanding private authentication manner and the private authentication device null laser luminous flux which utilize the fingertip blood current measurement
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机译:利用指尖电流测量的扩展私人认证方式和私人认证装置使激光光束无效
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摘要
A personal authentication method is provided that includes imaging, on an image sensor as a laser speckle using an optical system, light reflected from a blood vessel layer in subcutaneous and internal tissues when a laser beam is expanded and made to irradiate a finger pad, calculating a quantity that represents the rate of change with respect to time of the amount of light received for each pixel of the laser speckle, obtaining a finger pad blood flow map as a two-dimensional map of the numerical values, and comparison-checking the blood flow map against pre-registered data of individuals, wherein using a near-infrared laser beam or using this in combination with a visible laser beam, comparison-checking against pre-registered data of individuals is carried out using a pattern reflecting a fingerprint occurring within the finger pad blood flow map obtained from reflected light and, observed superimposed thereon, an internal tissue blood flow distribution pattern, and there is also provided a device used for the method.
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