Patent ID: 7031501

Claim:
An image collation apparatus comprising: an image database for recording a second image as a registered image; collation means for obtaining a plurality of coincidence ratios by collating a first image with the registered image, minimum coincidence ratio extraction means for obtaining a minimum coincidence ratio from the plurality of coincidence ratios obtained from said collation means; maximum coincidence ratio extraction means ( 30 ) for obtaining a maximum coincidence ratio from coincidence ratios output from said first collation means ( 20 , 22 ), computation means ( 40 ) for obtaining a difference between the maximum coincidence ratio output from said maximum coincidence ratio extraction means ( 30 ) and the minimum coincidence ratio output from said minimum coincidence ratio extraction means ( 31 ), and determination means ( 50 ) for determining that the first and second images are identical, if the difference output from said computation means ( 40 ) is not less than a predetermined threshold.