7 March 2005 Signatures of live fingers extracted from a series of fingerprint images
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Life recognition is desired for unattended fingerprint identification. We look at the color changes in a series of fingerprint images acquired during the course of an input action. As we press a finger upon an input device, a fingerprint area gradually increases and its color changes. This is due to the blood movements induced by a finger deformation. For example, we can declare a finger is alive if its color change exceeds a certain value. However, the color changes in the images acquired by a conventional device using a prism are very small. This is because the light reflected by the valley regions of a finger carries little information about the blood movements. We tried a fingerprint sensor based on scattered light detection. Here, a plastic plate serves as a light-guide for LEDs mounted on its edge. When a finger is pressed against the plate, the propagating light is scattered by the finger and leaks out of the plate. A standard color CCD camera placed near the plate captures the scattered light. Data extracted from more than ten people of different age groups indicate that there is a certain minimum value for the color changes.
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Ichiro Fujieda, Ichiro Fujieda, Etsuji Matsuyama, Etsuji Matsuyama, Masashi Kurita, Masashi Kurita, } "Signatures of live fingers extracted from a series of fingerprint images", Proc. SPIE 5677, Sensors and Camera Systems for Scientific and Industrial Applications VI, (7 March 2005); doi: 10.1117/12.585411; https://doi.org/10.1117/12.585411

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