Image Scanning Method for Vascular Pattern Recognition

Because vascular patterns inside skin tissue are unique to individuals and impossible to counterfeit, they can be used for biometric identification. However, due to light scattering by skin tissue, obtaining a clear image without imaging the transmitted light using a lens is difficult, which in turn results in a large detection system. In this study, we present a novel method for imaging vascular patterns that uses image scanning with reflected light and no lenses. We numerically confirm that the image scanning method produces a clearer image than imaging methods that do not employ the scanning method. In addition, using a smaller light source and detector produces a clearer image of vascular patterns. At a scan pixel size of 2 µ m, we determined that the degree of cross-correlation was G = 0.74.