Iris feature point comparison method based on bidirectional minimum Hamming distance

The invention discloses an iris feature point comparison method based on a bidirectional minimum Hamming distance. According to the invention, the comparison strategy of the iris feature points is determined according to the binarization result of the iris feature point codes by the feature point descriptors. The method comprises the steps: employing binary feature vectors of all feature points inan iris to be verified and a reference iris for constructing vector matrixes respectively, wherein the number of rows represents the number of the feature points detected in the two irises, and the number of columns represents the length of the feature vectors; calculating the Hamming distance between the feature vectors in a crossed manner, if the Hamming distances are the minimum Hamming distances, keeping the Hamming distances, otherwise, not keeping the Hamming distances; and finally, calculating the comparison rate of the iris feature points to complete iris verification. Compared with an existing iris feature p