Fingerprint authentication device, fingerprint authentication program, and fingerprint authentication method

A computer implemented method for fingerprint authentication, the method comprising:

• judging whether a fingerprint authentication process has successfully been performed, based on a comparison result obtained by comparing input fingerprint information generated from a fingerprint image input through a fingerprint sensor with registered fingerprint information registered in advance;
• obtaining, in a case where an authentication result indicating that the fingerprint authentication process has failed is obtained, an overlapping area size corresponding to a time when the input fingerprint information and the registered fingerprint information overlap each other the most;
• judging, using a processor, whether a re-input of the input fingerprint image is to be requested, by using the obtained overlapping area size and a similarity level that indicates a matching degree between the input fingerprint information and the registered fingerprint information corresponding to the time when the input fingerprint information and the registered fingerprint information overlap each other the most;
• and
• requesting the re-input of the input fingerprint image in a case where a judgment result indicating that the re-input of the input fingerprint image is to be requested is obtained.

A non-transitory computer-readable recording medium that stores therein a computer program causing a computer to execute:

• judging whether a fingerprint authentication process has successfully been performed, based on a comparison result obtained by comparing input fingerprint information generated from a fingerprint image input through a fingerprint sensor with registered fingerprint information registered in advance;
• obtaining, in a case where an authentication result indicating that the fingerprint authentication process has failed is obtained, an overlapping area size corresponding to a time when the input fingerprint information and the registered fingerprint information overlap each other the most;
• judging whether a re-input of the input fingerprint image is to be requested, by using the obtained overlapping area size and a similarity level that indicates a matching degree between the input fingerprint information and the registered fingerprint information corresponding to the time when the input fingerprint information and the registered fingerprint information overlap each other the most;
• and
• requesting the re-input of the input fingerprint image in a case where a judgment result indicating that the re-input of the input fingerprint image is to be requested is obtained.