Patent ID: 7480397
Filing Date: 2009-01-20
Classification: A61B,G06K,H04N

Abstract:
1. A fingerprint image processing apparatus comprising: a line sensor including a plurality of image pickup elements; a pixel value detecting unit which detects a respective maximum value and a respective minimum value from fingerprint image data output from each of the image pickup elements; a pixel value range detecting unit which detects a pixel value range between the respective maximum value and the respective minimum value detected by the pixel value detecting unit for the fingerprint image data read by each of the image pickup elements; a normalized data generating unit which generates, for each pixel of the fingerprint image data, normalized data that indicates a ratio of a pixel value of the pixel to the pixel value range corresponding to the image pickup element which read the pixel; a normalized data average calculating unit which calculates averages, corresponding respectively to the image pickup elements, of the normalized data generated by the normalized data generating unit from the fingerprint image data read by the respective image pickup elements; and a pixel value correcting unit which corrects a pixel value of each of the pixels of the fingerprint image data based on: (i) the average calculated by the normalized data average calculating unit corresponding to the image pickup element which read the pixel, and (ii) a maximum possible pixel value of the pixels.