Signature verification apparatus, system, method, and program

A signature verification apparatus comprising:

• first verification circuitry configured to verify a user's signature by comparing dynamic signature data indicating a change of a user's writing state over time during signing of his or her name by the user and reference data for dynamic signature;
• second verification circuitry configured to verify the user's signature by comparing static signature data indicating a writing path during the signing of his or her name by the user and reference data for static signature;
• data registration circuitry configured to register the reference data for dynamic signature based on a plurality of pieces of dynamic signature data acquired from the same user and register the reference data for static signature on based on a plurality of pieces of static signature data acquired from the same user,
• wherein in a case where the reference data for static signature has yet to be registered by the data registration circuitry, the second verification circuitry is configured to verify the user's signature by regarding static signature data generated from the reference data for dynamic signature already registered as the reference data for static signature,
• wherein the first verification circuitry is configured to verify the user's signature by calculating a first score indicating a degree of match with the reference data for dynamic signature,
• wherein the second verification circuitry is configured to verify the user's signature by calculating a second score indicating a degree of match with the reference data for static signature, and
• score adjustment circuitry configured to adjust the first and second scores such that a difference between the first score and the second score calculated based on a same dynamic signature data diminishes.

A signature verification method using one or a plurality of computers, comprising:

• verifying a user's signature by comparing dynamic signature data indicating a change of a user's writing state over time during signing of his or her name by the user and reference data for dynamic signature;
• verifying the user's signature by comparing static signature data indicating a writing path during the signing of his or her name by the user and reference data for static signature;
• and
• registering the reference data for dynamic signature based on a plurality of pieces of dynamic signature data acquired from the same user and registering the reference data for static signature based on a plurality of pieces of static signature data acquired from the same user,
• wherein in a case where the reference data for static signature has yet to be registered, the verifying the user's signature by comparing the static signature data indicating the writing path during the signing of his or her name by the user and the reference data for static signature comprises verifying the user's signature by regarding static signature data generated from the reference data for dynamic signature already registered as the reference data for static signature, and
• wherein in a case where the reference data for static signature is newly registered in a state in which the reference data for dynamic signature has already been registered, in the verifying the user's signature by comparing the static signature data indicating the writing path during signing of his or her name by the user and the reference data for static signature, the user's signature is verified by using the newly registered reference data for static signature in place of the static signature data generated from the reference data for dynamic signature.

A signature verification method using one or a plurality of computers, comprising:

• verifying a user's signature by comparing dynamic signature data indicating a change of a user's writing state over time during signing of his or her name by the user and reference data for dynamic signature;
• verifying the user's signature by comparing static signature data indicating a writing path during the signing of his or her name by the user and reference data for static signature;
• registering the reference data for dynamic signature based on a plurality of pieces of dynamic signature data acquired from the same user and registering the reference data for static signature based on a plurality of pieces of static signature data acquired from the same user,
• wherein in a case where the reference data for static signature has yet to be registered, the verifying the user's signature by comparing the static signature data indicating the writing path during the signing of his or her name by the user and the reference data for static signature comprises verifying the user's signature by regarding static signature data generated from the reference data for dynamic signature already registered as the reference data for static signature,
• wherein in the verifying the user's signature by comparing the dynamic signature data indicating the change of the user's writing state over time during the signing of his or her name and the reference data for dynamic signature, the user's signature being verified by calculating a first score indicating a degree of match with the reference data for dynamic signature, and
• wherein in the verifying the user's signature by comparing the static signature data indicating the writing path during the signing of his or her name by the user and the reference data for static signature, the user's signature being verified by calculating a second score indicating the degree of match with the reference data for static signature, and
• adjusting the first and second scores such that a difference between the first score and the second score calculated based on a same dynamic signature data diminishes.

A nontransitory processor-readable storage medium that stores instructions, the at least one nontransitory processor-readable storage medium, when executed by at least one processor, cause the at least one processor to:

• verify a user's signature by comparing dynamic signature data indicating a change of a user's writing state over time during signing of his or her name by the user and reference data for dynamic signature;
• verify the user's signature by comparing static signature data indicating a writing path during signing of his or her name by the user and reference data for static signature;
• and
• register the reference data for dynamic signature based on a plurality of pieces of dynamic signature data acquired from the same user and registering the reference data for static signature based on a plurality of pieces of static signature data acquired from the same user,
• wherein in a case where the reference data for static signature has yet to be registered, verify the user's signature comprises use static signature data generated from the reference data for dynamic signature already registered as the reference data for static signature, and
• wherein in a case where the reference data for static signature is newly registered in a state in which the reference data for dynamic signature has already been registered, verify the user's signature comprises use the newly registered reference data for static signature in place of the static signature data generated from the reference data for dynamic signature.