Biometric information processing apparatus, biometric information processing method

A biometric information processing method, comprising:

• acquiring biometric information of a first instance, a second instance and a third instance;
• extracting an authentication feature for matching from the biometric information of each of the second instance and the third instance;
• normalizing a relative position between authentication features of the second instance and the third instance by using the biometric information of the first instance;
• extracting a relative feature indicating a relative positional relationship between the authentication features of the second instance and the third instance normalized in the normalizing;
• narrowing out a matching candidate from a plurality of users registered in a database by matching relative features of the plurality of users with the extracted relative feature;
• and
• authenticating a user according to a result of matching the authentication feature and the relative feature for the matching candidate narrowed in the narrowing, among the authentication features and the relative features of the plurality of users registered in the database, with the authentication feature extracted in the extracting of the authentication feature and the relative feature extracted in the extracting of the relative feature.

A non-transitory computer-readable recording medium storing a program causing a computer to execute a process, the process comprising:

• acquiring biometric information of a first instance, a second instance and a third instance;
• extracting an authentication feature used for matching from the biometric information of the second instance and the third instance;
• normalizing a relative position of authentication features of the second instance and the third instance by using the biometric information of the first instance;
• and
• extracting a relative feature indicating a relative positional relationship between the authentication features of the second instance and the third instance normalized in the normalizing;
• narrowing out a matching candidate from a plurality of users registered in a database by matching relative features of the plurality of users with the extracted relative feature;
• and
• authenticating a user according to a result of matching the authentication feature and the relative feature for the matching candidate narrowed in the narrowing, among the authentication features and the relative features of the plurality of users registered in the database, with the authentication feature extracted in the extracting of the authentication feature and the relative feature extracted in the extracting of the relative feature.