# US 8,787,624 B2 · Biometric-information processing device, method of processing biometric information, and computer-readable recording medium storing biometric-information processing program > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,787,624 B2 - Document ID: US8787624B2 - Status: Granted - Kind: B2 - Application number: 13/401,247 - Filed: 2012-02-21 - Published: 2012-09-13 - Granted: 2014-07-22 - Earliest claimed: 2011-03-08 - Assignees: Fujitsu Limited - Applicants: Soichi Hama; Mitsuaki Fukuda; Takahiro Aoki; Yuka Jo - Inventors: Soichi Hama; Mitsuaki Fukuda; Takahiro Aoki; Yuka Jo - Web page: https://patentgrep.com/patent/US8787624B2 ## CPC - G06V 40/1312: {direct reading, e.g. contactless acquisition} - G06V 10/993: {Evaluation of the quality of the acquired pattern} - G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING ## Abstract A biometric-information processing device includes an image acquisition unit configured to acquire an image of a biometric object using light reflected from the biometric object. The biometric-information processing device further includes an extracting unit configured to extract a frequency component having a frequency higher than a predetermined spatial frequency at the image acquired by the image acquisition unit. ## Claims ### Claim 1 A biometric-information processing device comprising: a sensor configured to acquire an image of a biometric object using light reflected from the biometric object; and a processor configured to extract a frequency component having a frequency higher than a predetermined spatial frequency at the image, wherein the processor is further configured to carry out authentication processing using the image acquired by the sensor to determine a first index value of a surface reflection component of the biometric object from the frequency component extracted by the processor and to determine whether the authentication processing is to be carried out on the basis of the first index value, and wherein the frequency component is extracted from a light reflected at a surface of the biometric object, and is separated from another light reflected at a vein in the biometric object. ### Claim 2 (depends on 1) The biometric-information processing device according to claim 1, wherein the processor is further configured to process the image using the frequency component. ### Claim 3 (depends on 2) The biometric-information processing device according to claim 2, wherein the processor corrects brightness of the image using the frequency component extracted by the processor. ### Claim 4 (depends on 3) The biometric-information processing device according to claim 3, wherein the processor corrects brightness of the image using the frequency component extracted by the processor, the frequency component being binarized. ### Claim 5 (depends on 4) The biometric-information processing device according to claim 4, wherein the processor corrects brightness of the image using the frequency component extracted by the processor, the frequency component being binarized and smoothened. ### Claim 6 (depends on 5) The biometric-information processing device according to claim 5, wherein the processor corrects brightness of the image using the frequency component extracted by the processor, the frequency component being binarized, smoothened, and multiplied by a predetermined value. ### Claim 7 (depends on 1) The biometric-information processing device according to claim 1, wherein the processor determines whether the authentication processing is to be carried out on the basis of a difference between the first index value and a registered index value. ### Claim 8 (depends on 7) The biometric-information processing device according to claim 7, wherein the processor updates the registered index value to the first index value. ### Claim 9 (depends on 1) The biometric-information processing device according to claim 1, wherein the processor determines a weight to be added to vein information on the basis of the frequency component extracted by the processor and carries out the authentication processing using the weight. ### Claim 10 A method of processing biometric information comprising: acquiring an image of a biometric object using light reflected at the biometric object; extracting, by a processor, a frequency component having a frequency higher than a predetermined spatial frequency from the image acquired in the acquiring; carrying out an authentication process using the acquired image; determining a first index value of a surface reflection component of the biometric object from the frequency component extracted by the processor; and determining whether the authentication processing is to be carried out on the basis of the first index value, wherein the frequency component is extracted from a light reflected at a surface of the biometric object, and is separated from another light reflected at a vein in the biometric object. ### Claim 11 (depends on 10) The method of processing biometric information according to claim 10, further comprising: processing the image using the frequency component extracted in the extracting. ### Claim 12 (depends on 11) The method of processing biometric information according to claim 11, wherein, in the processing, brightness of the image is corrected using the frequency component extracted in the extracting. ### Claim 13 (depends on 12) The method of processing biometric information according to claim 12, wherein, in the processing, brightness of the image is corrected using the frequency component extracted in the extracting, the frequency component being binarized. ### Claim 14 (depends on 13) The method of processing biometric information according to claim 13, wherein, in processing, brightness of the image is corrected using the frequency component extracted by the extracting unit, the frequency component being binarized and smoothened. ### Claim 15 (depends on 14) The method of processing biometric information according to claim 14, wherein, in processing, brightness of the image is corrected using the frequency component extracted by the extracting unit, the frequency component being binarized, smoothened, and multiplied by a predetermined value. ### Claim 16 A computer-readable storage medium storing a biometric-information processing program that causes a computer to execute a process comprising: acquiring an image of a biometric object using light reflected from the biometric object; extracting frequency component having a frequency higher than a predetermined spatial frequency from the image acquired by the image acquisition unit; carrying out an authentication process using the acquired image; determining a first index value of a surface reflection component of the biometric object from the frequency component extracted by the processor; and determining whether the authentication processing is to be carried out on the basis of the first index value, wherein the frequency component is extracted from a light reflected at a surface of the biometric object, and is separated from another light reflected at a vein in the biometric object.