JP2006185299A5 - - Google Patents

Claims (4)

A photoelectric conversion pixel group arranged in a polar coordinate, and the photoelectric conversion of image light from an iris region of an eye so that a center of an iris image formed on the pixel group and a pole of the polar coordinate coincide with each other A polar coordinate sensor unit that forms an image on a pixel group, sequentially scans each photoelectric conversion pixel of the photoelectric conversion pixel group, and reads an iris image signal;
A feature extraction code generator for generating an iris feature extraction code based on the read iris image signal;
A comparison unit that compares the iris feature extraction code generated by the feature extraction code generation unit with a previously registered iris feature extraction code to generate a comparative evaluation value, the comparison evaluation value being the polar coordinate sensor unit A comparison unit that generates a comparative evaluation function having a greater weight toward the inner periphery of
The iris identification device is characterized in that the iris evaluation is performed by comparing the comparative evaluation value with a predetermined reference value.   An exclusive OR operation is performed for each pixel on the iris feature extraction code generated by the feature extraction code generation unit and the iris feature extraction code registered in advance, and the mismatched portion is weighted according to the radial position of each pixel. The iris identification device according to claim 1, wherein the comparative evaluation value is generated by integrating the values. The iris image signal is read out from the pixel at a predetermined reading start position in the circumferential direction of the polar sensor along the innermost analysis band, and then along the analysis band outside the analysis band. 2. The iris identification device according to claim 1, wherein reading for one round is performed from the reading start position, and then reading is sequentially performed toward the outer circumferential side. A plurality of iris feature extraction codes generated from iris image signals read out in parallel with each of a predetermined number of pixels consecutive in the circumferential direction as readout start positions, respectively, compared with previously registered iris feature extraction codes. The comparison and integration circuit is provided, and among the comparative evaluation values obtained by these comparison and integration circuits, the iris evaluation is performed by using the best comparison evaluation value. Iris identification device.