Private certification method and the private certification device which are based on subcutaneous blood style measurement

摘要

Making use of the character where subcutaneous blood style distribution is modulated spatially by the unevenness of the fingerprint, it is the private certification method the precision which extracts fingerprint pattern, uses this being high and something which offers the device. Namely, being the private certification method of featuring that the subcutaneous blood style is measured, (1) expanding laser luminous flux, the process where it irradiates to the finger stomach, the light which is reflected from the blood vessel layer which is under the skin, making use of optical system on the image sensor as a laser speckle the process which image formation is done, (2) the quantity which displays the speed of time change of the receiving light intensity in each pixel of the laser speckle, for example, following to mean time rate of change, or the exposure time of the image sensor, calculates the inverse number of degree of fluctuation of the receiving light intensity which is integrated, obtains the blood style maps of the finger stomach the numerical value as 2 dimensional mapThe private data which the fingerprint pattern which appears, (3) as blood style maps, beforehand is registered and the process which it compares & decides, it is the private certification device which possesses the private certification method of consisting of and the expedient which executes the respective process.