| 摘要 |
PURPOSE:To fetch always a clear picture having good contrast by discriminating the presence and the absence of the contrast of the obtained fingerprint picture and installing a discriminating display device which informs a tested person. CONSTITUTION:The automatic discriminating device 9 automatically discriminates whether or not based upon the density distribution of the picture obtained from a converting device 4, when a finger 2 is placed at the slope 3b of a rectangular prism, the fingerprint picture is fetched into a processing device 5. In the initial condition when the finger 2 is not placed on the slope 3b, the LED-10a of a display device 1 lights up and accelerates the tested person to place his finger 2. Next, when the finger 2 is placed, a LED-10b flickers, and the tested person awaits that the surface of the finger goes to be moist. Further, when the adhesion between the finger 2 and the slope 3b is increased, the uneven pattern of a clear fingerprint having good contrast is obtained. At such a time, it is informed that the fingerprint picture is fetched into the processing device 5, a LED-10c lights up, the clear fingerprint picture is obtained and fetched into the device 5.
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