摘要 |
PURPOSE:To simplify constitution by detecting coincidence with a registration fingerprint by detecting only the arrangement of minutiae by using image data to which linear scan can be applied on a light-and-shade fingerprint image. CONSTITUTION:An image input control part 12 checks the temporal gradation change of a picture element at a prescribed position in an image fetched at need after an identification number is inputted from an input part 19 to make access a minutiae list, and detects a fingerprint placing position, and also, automatically extracts a fingerprint image when the gradation value of the picture element exceeds a threshold value. A multivalue two-dimensional quantization image obtained in such away is stored in image memory 13. A collation processing part 18 stores the minutiae list in working memory 17. The collation processing part 18 accurately conforms the light-and-shade fingerprint image stored in the image memory 13 to the minutiae in the minutiae list accessed from a file 21. |