Method, system and program for authenticating a user by biometric information

A biometric authentication system for biometrically authenticating a user by terminal equipment and a server, which are connected via a network,

• the terminal equipment including:
• an image generation unit that generates an image for registration and an image for verification, from collected biometric information of the user;
• a filter generation unit that generates a random filter for scrambling any image for registration and an inverse filter of the random filter;
• a transformation unit that generates a registration template by scrambling the image for registration by applying the random filter generated in the filter generation unit to the image for registration generated in the image generation unit and generates a filtered verification image by applying the inverse filter to the image for verification;
• and
• a first communication unit that transmits the registration template and the filtered verification image, to the server,
• wherein the server including:
• a second communication unit that receives information transmitted from the terminal equipment;
• a registration unit that stores the registration template received via the second communication unit into a memory;
• and
• a verification unit that matches the filtered verification image obtained via the second communication unit during authentication against the registration template stored in the memory, and calculates cross-correlation between the filtered verification image and the registration templates,
• thereby to verify the identity of the user according to a calculation result of the verification unit.

Terminal equipment coupled to a server for biometrically authenticating a user based on cross-correlation between an enrolled image and a verification image of biometric information of the user, the terminal equipment comprising:

• a biometric data collection unit that collects biometric information;
• an image generation unit that generates the enrolled image and the verification image from the collected biometric information of the user;
• a filter generation unit that generates a random filter for scrambling the enrolled image and an inverse filter of the random filter;
• a transformation unit that generates a registration template by scrambling the enrolled image by applying the random filter generated in the filter generation unit to the enrolled image generated in the image generation unit, and generates a filtered verification image by applying the inverse filter to the verification image;
• and
• a communication unit that transmits the registration template and the filtered verification image to the server,
• thereby the server performs biometric authentication by using the registration template and the filtered verification image.

A biometric device coupled to other equipment for biometrically authenticating a user based on cross-correlation between an enrolled image and a verification image of biometric information of the user, the biometric device comprising:

• a sensor that collects biometric information from a user;
• an image generation unit that generates the enrolled image and the verification image from the collected biometric information of the user;
• a filter generation unit that generates a random filter for scrambling the enrolled image and an inverse filter of the random filter;
• and
• a transformation unit that generates a registration template by scrambling the enrolled image by applying the random filter generated in the filter generation unit to the enrolled image generated in the image generation unit, and generates a filtered verification image by applying the inverse filter to the verification image,
• thereby the other equipment performs biometric authentication by using the registration template and the filtered verification image.

A non-transitory computer-readable medium embodying a program to be executed by a biometric authentication system including terminal equipment and a server, which are connected via a network, the program comprising:

• an image generating step of generating an image for registration and an image for verification from collected biometric information of a user, in the terminal equipment;
• a filter generating step of generating a random filter for scrambling any image for registration and an inverse filter of the random filter, in the terminal equipment;
• a transforming step of generating a registration template by scrambling the image for registration by applying the random filter generated in the filter generating step to the image for registration generated in the image generating step and for generating a filtered verification image by applying the inverse filter to the image, in the terminal equipment;
• a step of transmitting the registration template and the filtered verification image to the server, in the terminal equipment;
• a registering step of storing the registration template transmitted and obtained from the terminal equipment into a memory in the server;
• and
• a verifying step of verifying the filtered verification image transmitted and obtained from the terminal equipment during authentication against the registration template stored in the memory to calculate cross-correlation between the filtered verification image and the registration templates, in the server,
• thereby to perform authentication according to a calculation result of the verifying step.

A biometric authentication system for biometrically authenticating a user by terminal equipment and a server, which are connected via a network,

• the terminal equipment including:
• an image generation unit that generates an image for registration and an image for verification, from collected biometric information of the user;
• a local image cutting unit that selects coordinates at one or more locations on the image, and cuts out a local image of a predetermined size around each of the coordinates;
• a filter generation unit that generates a random filter for scrambling any image for registration and an inverse filter of the random filter;
• a transformation unit that generates a registration template by scrambling the image for registration by applying respective random filters generated in the filter generation unit to respective local images for registration generated in the local image cutting unit, and generates a local image for filtered verification by applying respective inverse filters to respective images for verification;
• and
• a first communication unit that transmits the registration template and the filtered verification local image, to the server,
• wherein the server including:
• a second communication unit that receives information transmitted from the terminal equipment;
• a registration unit that stores the registration template received via the second communication unit into a memory;
• a local image verification unit that matches the filtered verification local image obtained via the second communication unit against the registration template stored in the memory, to determine a match or mismatch by cross-relation between the filtered verification image and the registration templates;
• and
• a determination unit that determines the match or mismatch of the biometric information based on the number of the matched local images,
• thereby to authenticate the user according to a determination result of the determination unit.

A biometric authentication system for biometrically authenticating a user, comprising:

• an image generation unit that generates an image for registration or verification from the collected biometric information of the user;
• a filter generation unit that generates a random filter for scrambling an image for registration and an inverse filter of the random filter;
• a transformation unit that generates a registration template by scrambling the image for registration by applying the random filter generated in the filter generation unit to the image for registration generated in the image generation unit, and generates a filtered verification image by applying the inverse filter to the image for verification;
• a registration unit that stores the registration template into a memory;
• and
• a verification unit that matches the filtered verification image obtained during authentication against the registration template stored in the memory, and calculates cross-relation between the filtered verification image and the registration templates,
• thereby to authenticate the user according to a calculation result of the verification unit.