Fingerprint image judgment apparatus and program

A fingerprint image judgment apparatus which judges whether or not fingerprint image data composed of a plurality of pixel values indicating contrast information of pixels has been correctly read by a fingerprint sensor, comprising:

• a first memory for storing the pixels values of a predetermined number;
• a formation judgment unit for judging whether or not the pixel values form any one of ridges and valleys in any one direction of the X-axis and Y-axis directions in the fingerprint image data;
• a second memory for storing a judgment result judged by the formation judgment unit;
• a storage unit for sequentially storing the pixel values of the fingerprint image data in the first memory at intervals of a predetermined number, the fingerprint image data being read by the fingerprint sensor along one of the directions;
• a first count unit for counting any one of the number of ridges and valleys in said one of the directions based on the pixel values stored in the first memory;
• a second count unit for counting any one of the number of ridges and valleys in the other direction of the X-axis and Y-axis directions, based on the judgment result stored in the second memory and the pixel values stored in the first memory;
• and
• a correctibility judgment unit for judging whether or not the fingerprint image data has been correctly read by the fingerprint sensor, based on any one of the number of ridges and valleys counted by the first count unit and any one of the number of ridges and valleys counted by the second count unit with respect to the entire fingerprint image data.