Fingerprint identification system

• US 20030091724A1
• Filed: 01/28/2002
• Published: 05/15/2003
• Est. Priority Date: 01/29/2001
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Mizoguchi, Masanori
• Granted Patent: US 7,184,579 B2
• Time in Patent Office: Days
• US Class Current: 427/1
• CPC Class Codes: G06F 18/256 of results relating to different input data, e.g. multimodal recognition
• CPC Class Codes: G06V 10/811 the classifiers operating on different input data, e.g. multi-modal recognition
• CPC Class Codes: G06V 10/993 Evaluation of the quality of the acquired pattern
• CPC Class Codes: G06V 40/1365 Matching; Classification

Abstract

The fingerprint identification system includes a fingerprint identification terminal having a function of receiving input of a plurality of fingerprint images taken from one target finger to select a fingerprint image suited for identification processing based on image quality determination and a fingerprint identification device having a function of outputting an identification result by selectively combining, for each image, one-to-N matching, one-to-one matching, fusion score calculation from a plurality of scores and condition determination of an identification score and a fusion score.

Claims

1. A fingerprint identification system for conducting identification of fingerprints using fingerprint images, comprising:

a fingerprint identification device for conducting fingerprint identification based on first feature vector data obtained by extracting features of a fingerprint from a fingerprint image; and

a fingerprint identification terminal for transmitting a fingerprint image or the first feature vector data of the fingerprint image to said fingerprint identification device remotely disposed and receiving an identification result from said fingerprint identification device, wherein

said fingerprint identification terminal receives input of a plurality of fingerprint images for one finger, calculates image quality of said fingerprint image to rearrange said plurality of fingerprint images based on the image quality, and transmits the first feature vector data of said fingerprint images rearranged to the fingerprint identification device, and

said fingerprint identification device receives input of the first feature vector data of the plurality of fingerprint images for one finger and collates the first feature vector data of said plurality of fingerprint images with second feature vector data of a plurality of fingerprint images stored in a fingerprint data base to conduct fingerprint identification determination based on a plurality of identification scores corresponding to the respective second feature vector data which are obtained from the matching result.

2. The fingerprint identification system as set forth in claim 1, wherein

said fingerprint identification terminal includes

a scanner interface unit having a function of receiving input of a plurality of fingerprint images per finger from an external fingerprint scanner device, a main memory for holding said plurality of fingerprint images, and a main control unit for calculating image quality of each of the plurality of fingerprint images held in said main memory, ranking the plurality of fingerprint images in said main memory in descending order of quality and selecting a preset number of high-quality images to calculate first feature vector data of a fingerprint from the selected fingerprint image.

3. The fingerprint identification system as set forth in claim 2, wherein

said fingerprint identification terminal includes

a communication input/output control unit having a function of sending said selected fingerprint image or the first feature vector data of the image to said fingerprint identification device and a function of receiving identification result data returned from said fingerprint identification device.

4. The fingerprint identification system as set forth in claim 2, wherein

said fingerprint identification terminal includes:

a console display unit capable of displaying any of confirmation indication, processing state indication and fingerprint identification processing result indication of the plurality of fingerprint images stored in said main memory or an arbitrary combination of these indications, and

an input unit for receiving input for changing a display method of said console display unit and changing condition data for use in fingerprint identification which is set in advance in the processing of said main control unit.

5. The fingerprint identification system as set forth in claim 1, wherein

said fingerprint identification device receives

input of feature vector data of each of the plurality of fingerprint images for one finger, and following a procedure predetermined according to the order of fingerprint image quality corresponding to each said fingerprint image, selects execution of either one-to-N matching or one-to-one matching between said first feature vector data and said second feature vector data, executes the selected matching processing, selects first feature vector data of a fingerprint image to be targeted next based on the determination whether each matching result satisfies preset conditions or not and repeats either one-to-N or one-to-one matching of the first feature vector data with said second feature vector data to output an identification result of the plurality of fingerprint images.

6. The fingerprint identification system as set forth in claim 1, wherein

said fingerprint identification terminal includes

a scanner interface unit having a function of receiving input of a plurality of fingerprint images per finger from an external fingerprint scanner device, a main memory for holding said plurality of fingerprint images, and a main control unit for calculating image quality of each of the plurality of fingerprint images held in said main memory, ranking the plurality of fingerprint images in said main memory in descending order of quality and selecting a preset number of high-quality images to calculate first feature vector data of a fingerprint from the selected fingerprint image, and

said fingerprint identification device receives

input of feature vector data of each of the plurality of fingerprint images for one finger, and following a procedure predetermined according to the order of fingerprint image quality corresponding to each said fingerprint image, selects execution of either one-to-N matching or one-to-one matching between said first feature vector data and said second feature vector data, executes the selected matching processing, selects first feature vector data of a fingerprint image to be targeted next based on the determination whether each matching result satisfies preset conditions or not and repeats either one-to-N or one-to-one matching of the first feature vector data with said second feature vector data to output an identification result of the plurality of fingerprint images.

7. The fingerprint identification system as set forth in claim 1, wherein

said fingerprint identification device

receives input of the first feature vector data of each of the plurality of fingerprint images for one finger and conducts one-to-N matching of all of the first feature vector data with the second feature vector data to select only the identification scores that satisfy preset conditions starting with a score having the largest value,

conducts fusion operation of the selected identification score with identification scores corresponding to a plurality of feature vector data of the same finger to calculate a fusion score, and

outputs an identification result based whether the fusion score satisfies preset identification conditions.

8. The fingerprint identification system as set forth in claim 1, wherein

said fingerprint identification device receives

input of each feature vector data of a plurality of fingerprint image data for each of a plurality of fingers to output an identification result with a representative score calculated from said feature vector data of the plurality of fingerprint images of each finger in combination with a result of whether the representative score of each finger satisfies preset conditions.

9. The fingerprint identification system as set forth in claim 1, wherein

said fingerprint identification device receives

input of each feature vector data of a plurality of fingerprint image data for each of a plurality of fingers to obtain a representative score calculated from said feature vector data of the plurality of fingerprint images of each finger, and calculates a fusion score based on the representative score of each finger to output a result of whether the fusion score satisfies preset identification conditions as an identification result.

10. A fingerprint identification method of conducting identification of fingerprints based on fingerprint images, comprising the steps of:

at said fingerprint identification terminal,

receiving input of a plurality of fingerprint images for one finger,

calculating image quality of said fingerprint image to rearrange said fingerprint images based on the image quality, and

extracting first feature vector data of said fingerprint images rearranged to transmit the data to the fingerprint identification device, and

at said fingerprint identification device,

receiving input of the first feature vector data of the plurality of fingerprint images for one finger,

collating the first feature vector data of said plurality of fingerprint images with second feature vector data of a plurality of fingerprint images stored in a fingerprint data base, and

conducting fingerprint identification determination based on a plurality of identification scores corresponding to the respective second feature vector data which are obtained from the matching result.

11. The fingerprint identification method as set forth in claim 10, wherein

said fingerprint identification terminal receives and displays identification result data of said fingerprint images obtained by said fingerprint identification device.

12. The fingerprint identification method as set forth in claim 10, wherein

said fingerprint identification terminal,

receives input of a plurality of fingerprint images per finger from an external fingerprint scanner device by a scanner interface unit,

holds said plurality of fingerprint images in a main memory,

calculates image quality of each of the plurality of fingerprint images held in said main memory,

ranks the plurality of fingerprint images in said main memory according to said quality in descending order of quality to select a preset number of high-quality images,

calculates first feature vector data of a fingerprint from said selected fingerprint image and sends said selected fingerprint image or the first feature vector data of the image to said fingerprint identification device, and

receives identification result data returned from said fingerprint identification device.

13. The fingerprint identification method as set forth in claim 10, wherein

said fingerprint identification device

receives input of feature vector data of each of the plurality of fingerprint images for one finger, and following a procedure predetermined according to the order of fingerprint image quality corresponding to each said fingerprint image,

selects execution of either one-to-N matching or one-to-one matching between said first feature vector data and said second feature vector data,

executes the selected matching processing to select first feature vector data of a fingerprint image to be targeted next based on the determination whether each matching result satisfies preset conditions or not, and

repeats either one-to-N or one-to-one matching of the first feature vector data with said second feature vector data to output an identification result of the plurality of fingerprint images.

14. The fingerprint identification method as set forth in claim 10, wherein

said fingerprint identification device

receives input of the first feature vector data of each of the plurality of fingerprint images for one finger and conducts one-to-N matching of all of the first feature vector data with the second feature vector data to select only the identification scores that satisfy preset conditions starting with a score having the largest value,

conducts fusion operation of the selected identification score with identification scores corresponding to a plurality of feature vector data of the same finger to calculate a fusion score, and

outputs an identification result based whether the fusion score satisfies preset identification conditions.

15. The fingerprint identification method as set forth in claim 10, wherein

said fingerprint identification device receives

input of each feature vector data of a plurality of fingerprint image data for each of a plurality of fingers to output an identification result with a representative score calculated from said feature vector data of the plurality of fingerprint images of each finger in combination with a result of whether the representative score of each finger satisfies preset conditions.

16. The fingerprint identification method as set forth in claim 10, wherein

said fingerprint identification device receives

input of each feature vector data of a plurality of fingerprint image data for each of a plurality of fingers to obtain a representative score calculated from said feature vector data of the plurality of fingerprint images of each finger, and calculates a fusion score based on the representative score of each finger to output a result of whether the fusion score satisfies preset identification conditions as an identification result.

17. A fingerprint identification program for conducting identification of fingerprints based on fingerprint images by the control of a computer, which causes

said fingerprint identification terminal to execute the functions of:

receiving input of a plurality of fingerprint images for one finger,

calculating image quality of said fingerprint image to rearrange said fingerprint images based on the image quality, and

extracting first feature vector data of said fingerprint images rearranged to transmit the data to the fingerprint identification device, and

said fingerprint identification device to execute the functions of;

receiving input of the first feature vector data of the plurality of fingerprint images for one finger,

collating the first feature vector data of said plurality of fingerprint images with second feature vector data of a plurality of fingerprint images stored in a fingerprint data base, and

conducting fingerprint identification determination based on a plurality of identification scores corresponding to the respective second feature vector data which are obtained from the matching result.

18. The fingerprint identification program as set forth in claim 17, which causes

said fingerprint identification device to execute the functions of:

receiving input of feature vector data of each of the plurality of fingerprint images for one finger, and following a procedure predetermined according to the order of fingerprint image quality corresponding to each said fingerprint image,

selecting execution of either one-to-N matching or one-to-one matching between said first feature vector data and said second feature vector data,

executing the selected matching processing to select first feature vector data of a fingerprint image to be targeted next based on the determination whether each matching result satisfies preset conditions or not, and

repeating either one-to-N or one-to-one matching of the first feature vector data with said second feature vector data to output an identification result of the plurality of fingerprint images.

19. The fingerprint identification program as set forth in claim 17, which causes

said fingerprint identification device to execute the functions of:

receiving input of the first feature vector data of each of the plurality of fingerprint images for one finger and conducting one-to-N matching of all of the first feature vector data with the second feature vector data to select only the identification scores that satisfy preset conditions starting with a score having the largest value,

conducting fusion operation of the selected identification score with identification scores corresponding to a plurality of feature vector data of the same finger to calculate a fusion score, and

outputting an identification result based whether the fusion score satisfies preset identification conditions.

20. The fingerprint identification program as set forth in claim 17, which causes

said fingerprint identification device to execute the function of

receiving input of each feature vector data of a plurality of fingerprint image data for each of a plurality of fingers to output an identification result with a representative score calculated from said feature vector data of the plurality of fingerprint images of each finger in combination with a result of whether the representative score of each finger satisfies preset conditions.

21. The fingerprint identification program as set forth in claim 17, which causes

said fingerprint identification device to execute the function of

receiving input of each feature vector data of a plurality of fingerprint image data for each of a plurality of fingers to obtain a representative score calculated from said feature vector data of the plurality of fingerprint images of each finger, and calculating a fusion score based on the representative score of each finger to output a result of whether the fusion score satisfies preset identification conditions as an identification result.