| 摘要 |
This invention includes an image quality priority level decision processing unit ( 40 ) which evaluates the magnitude of an image quality of each of a plurality of first image data formed from biometric images associated with the same target on the basis of a specific index having the relationship of a monotone function with authentication accuracy of biometric authentication, and outputs each of the first image data upon adding a priority level thereto on the basis of the evaluation result, a first image storage ( 6, 81 ) unit which stores each of the first image data having a priority level added thereto from the image quality priority level decision processing unit ( 40 ), a second image storage unit ( 8, 61 ) which stores second image data used for comparison/collation with the first image data, an image collation unit ( 7 ) which compares/collates the second image data stored in the second image storage unit ( 8, 61 ) with the first image data stored in the first image storage unit ( 6, 81 ) and outputs the comparison/collation result, and a control unit ( 9 ) which controls each of the units. The control unit ( 9 ) causes the image collation unit ( 7 ) to compare/collate the second image data stored in the second image storage unit ( 8, 61 ) with the first image data stored in the first image storage unit ( 6, 81 ) in accordance with the priority levels, and outputs the comparison/collation result from the image collation unit ( 7 ).
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