Personal authentication method and a personal authentication device using subcutaneous blood flow measuring

By expanding the laser beam is irradiated to the finger pad, the light reflected from the blood vessel layer in the subcutaneous, focused as a laser speckle on an image sensor using an optical system, the time the amount of received light at each pixel of the laser speckle calculating a quantity representing the rate of change, determine the blood flow map of the finger pad that number as a two-dimensional map, a blood flow map, wherein the comparing and collating the personal data has been registered in advance in personal authentication method utilizing subcutaneous blood flow measurement, an area deviated from the irradiation site of the laser as the observation region of the image sensor, and personal authentication method consists in focusing a laser speckle on an image sensor, used for the personal authentication device. It relates to an apparatus and method for performing usage to individual authentication fingerprint pattern or the like based on finger pad of the laser speckle, improved techniques for accurately extracted, such as a fingerprint pattern.