Methods and apparatuses for updating user authentication data

1. A method for updating biometric authentication data in an enrollment database (DB) stored in a memory of a device that provides a secured application service, the method comprising:

receiving a request to perform a biometric authentication instance of an individual based on an input image including biometric information in order to access the secured application service;

authenticating the input image using the enrollment DB stored in the memory over a first length of time, the first length of time corresponding to a duration of authenticating the input image; and

updating the enrollment DB stored in the memory based on the input image, wherein a duration of the updating is limited to a difference between an allocated duration for completing the biometric authentication instance and the first length of time

wherein limiting the biometric authentication instance to the allocated duration prevents a delay from increasing in providing the secured application service.

2. The method of claim 1 , wherein the updating comprises:

determining similarities based on sizes of overlap regions between the input image and enrolled images in the enrollment DB; and

determining whether to enroll the input image in the enrollment DB based on the similarities.

3. The method of claim 2 , wherein the determining comprises at least one of:

determining a portion of the similarities based on the information for authenticating the input image; and

determining the portion of the similarities to be a minimum value based on the first length of time.

4. The method of claim 2 , wherein the determining whether to enroll the input image comprises at least one of:

determining if a maximum similarity of the similarities is less than or equal to an upper threshold; and

determining if the maximum similarity is greater than or equal to a lower threshold.

5. The method of claim 2 , wherein an upper threshold corresponds to a maximum similarity based on an overlap area between the enrolled images.

6. The method of claim 1 , wherein the information for authenticating the input image includes at least one of correlations in overlap regions between the input image and enrolled images in the enrollment DB, and sizes of the overlap regions between the input image and the enrolled images.

7. The method of claim 1 , wherein the authenticating comprises:

determining sizes of overlap regions between the input image and enrolled images in the enrollment DB;

determining correlations in the overlap regions between the input image and the enrolled images;

determining if the correlations are greater than or equal to a threshold;

outputting an accept signal if the correlations are greater than or equal to the threshold; and

storing the sizes of the overlap regions and the correlations in a memory, the stored sizes of the overlap regions and the correlations corresponding to the enrolled images.

8. The method of claim 7 , wherein the authenticating further comprises:

storing the first length of time in the memory.

9. The method of claim 1 , wherein the authenticating comprises:

authenticating the input image using multi-stage authentication.

10. The method of claim 1 , wherein the updating comprises at least one of:

adding the input image to the enrollment DB; and

replacing one of enrolled images in the enrollment DB with the input image.

11. The method of claim 10 , wherein the replacing comprises:

selecting a replacement image based on similarities, the similarities based on sizes of overlap regions between the enrolled images.

12. A method of managing a database (DB) stored in a memory of a device that provides a secured application service, comprising:

receiving a request to perform a biometric authentication instance based on an input image including biometric information;

authenticating the input image based on enrolled images in the DB stored in the memory during a first length of time, the first length of time corresponding to a duration of authenticating the input image; and

updating the DB stored in the memory, the updating including,

deciding whether to add the input image to the DB,

adding the input image to the DB stored in the memory based on the deciding, and

limiting the updating to a difference between an allocated duration for completing the biometric authentication instance and the first length of time, wherein the limiting prevents a delay from increasing in providing the secured application service.

13. The method of claim 12 , wherein the biometric information is fingerprint information.

14. The method of claim 12 , wherein the updating comprise's:

determining similarities based on sizes of overlap regions between the input image and the enrolled images; and

deciding whether to enroll the input image in the DB based on the similarities.

15. The method of claim 14 , wherein the determining comprises at least one of:

determining at least a portion of the similarities based on the authenticating the input image; and

determining the portion of the similarities to be a set value based on the allocated duration for biometric authentication and a length of time associated with the authenticating.

16. The method of claim 14 , wherein the deciding whether to enroll the input image comprises at least one of:

determining if a maximum similarity of the similarities, is less than or equal to an upper threshold; and

determining if the maximum similarity is greater than or equal to a lower threshold.

17. The method of claim 12 , wherein the updating comprises:

selecting a replacement image based on similarities, the similarities based on sizes of overlap regions between the enrolled images.