# US 12,217,542 B2 · Imaging system, imaging method, and non-temporary computer-readable medium storing imaging program > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,217,542 B2 - Document ID: US12217542B2 - Status: Granted - Kind: B2 - Application number: 17/912,222 - Filed: 2020-03-30 - Published: 2023-04-27 - Granted: 2025-02-04 - Earliest claimed: 2020-03-30 - Assignees: NEC Corporation - Applicants: NEC Corporation - Inventors: Yuka Ogino; Keiichi Chono - Web page: https://patentgrep.com/patent/US12217542B2 ## CPC - G06F 21/32: using biometric data, e.g. fingerprints, iris scans or voiceprints - G06V 40/19: Sensors therefor - G06V 10/141: Control of illumination - G06V 10/25: Determination of region of interest [ROI] or a volume of interest [VOI] - G06V 40/197: {Matching; Classification} - G06V 40/67: {by interactive indications to the user} - H04N 23/611: where the recognised objects include parts of the human body - H04N 23/675: {comprising setting of focusing regions} - H04N 23/69: Control of means for changing angle of the field of view, e.g. optical zoom objectives or electronic zooming - H04N 23/695: Control of camera direction for changing a field of view, e.g. pan, tilt or based on tracking of objects - H04N 23/90: Arrangement of cameras or camera modules, e.g. multiple cameras in TV studios or sports stadiums - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract An imaging system (10) according to the disclosure includes: a first control unit (11) configured to control, in such a way as to fix a focal position in a predetermined position, an iris imaging means for capturing an image focusing on an iris of a target person; an authentication unit (12) configured to authenticate the target person, based on an iris image of the target person being captured by the iris imaging means controlled by the first control unit (11); and a second control unit (13) configured to control the iris imaging means in such a way as to scan a focal position in a predetermined range, in order to re-authenticate the target person when authentication of the target person fails. ## Claims ### Claim 1 An imaging system comprising: a memory storing instructions, and a processor configured to execute the instructions stored in the memory to: control, in such a way as to fix a focal position in a predetermined position, an iris imaging unit capturing an image focusing on an iris of a target person; authenticate the target person, based on an iris image of the target person being captured by the controlled iris imaging unit; control the iris imaging unit in such a way as to scan a focal position in a predetermined range, in order to re-authenticate the target person when authentication of the target person fails; control in such a way as to fix the focal position when the target person is authenticated in a first authentication mode; and perform control in such a way as to scan the focal position when the target person is authenticated in a second authentication mode, wherein the first authentication mode is an authentication mode of authenticating the target person while moving, and the second authentication mode is an authentication mode of authenticating the target person while stopping. ### Claim 2 (depends on 1) The imaging system according to claim 1, wherein the processor is further configured to execute the instructions stored in the memory to control guide unit guiding movement of the target person, and control controls the guide unit in such a way as to stop the target person while moving when authentication of the target person fails. ### Claim 3 (depends on 2) The imaging system according to claim 2, wherein the guide unit is a gate through which the target person passes, and the processor is further configured to execute the instructions stored in the memory to perform control in such a way as to close the gate when authentication of the target person fails. ### Claim 4 (depends on 2) The imaging system according to claim 2, wherein the guide unit is an output unit outputting an authentication result of the target person, and the processor is further configured to execute the instructions stored in the memory to output information for stopping movement of the target person from the output unit when authentication of the target person fails. ### Claim 5 (depends on 1) The imaging system according to claim 1, wherein the iris imaging unit includes a variable focus lens, and the processor is further configured to execute the instructions stored in the memory to control a lens focus driving value of the variable focus lens. ### Claim 6 (depends on 1) The imaging system according to claim 1, wherein the processor is further configured to execute the instructions stored in the memory to set a focal position of the iris imaging unit according to a position of the target person. ### Claim 7 (depends on 1) The imaging system according to claim 1, wherein the processor is further configured to execute the instructions stored in the memory to change an angle of view of the iris imaging unit when authentication of the target person fails. ### Claim 8 (depends on 1) The imaging system according to claim 1, wherein the processor is further configured to execute the instructions stored in the memory to change an imaging direction of the iris imaging unit when authentication of the target person fails. ### Claim 9 (depends on 1) The imaging system according to claim 1, wherein the processor is further configured to execute the instructions stored in the memory to set a region of interest (ROI) including an eye of the target person for the iris imaging unit, based on a whole image being captured by a whole imaging unit capturing the target person in an area wider than that of the iris imaging unit. ### Claim 10 (depends on 9) The imaging system according to claim 9, wherein the processor is further configured to execute the instructions stored in the memory to transform coordinates of an eye of the target person in the whole image into coordinates in the iris image by using a coordinate transformation matrix associated with the fixed focal position, and set the ROI, based on the transformed coordinates. ### Claim 11 (depends on 10) The imaging system according to claim 10, wherein the processor is further configured to execute the instructions stored in the memory to set the ROI for the iris imaging unit, based on the transformed coordinates. ### Claim 12 (depends on 10) The imaging system according to claim 10, further comprising a plurality of iris imaging units as the iris imaging unit, wherein the processor is further configured to execute the instructions stored in the memory to select the set iris imaging unit from among the plurality of iris imaging unit, based on the transformed coordinates. ### Claim 13 (depends on 12) The imaging system according to claim 12, wherein the processor is further configured to execute the instructions stored in the memory to select the set iris imaging unit from among the plurality of iris imaging units, based on the transformed coordinates. ### Claim 14 (depends on 1) The imaging system according to claim 1, wherein the processor is further configured to execute the instructions stored in the memory to set an ROI including an eye of the target person for the iris imaging unit, based on a whole image being captured by a whole imaging unit capturing the target person in an area wider than that of the iris imaging unit. ### Claim 15 (depends on 14) The imaging system according to claim 14, wherein the processor is further configured to execute the instructions stored in the memory to transform coordinates of an eye of the target person in the whole image into coordinates in the iris image by using a coordinate transformation matrix associated with a position of the target person, and sets the ROI, based on the transformed coordinates. ### Claim 16 (depends on 1) The imaging system according to claim 1, wherein the processor is further configured to execute the instructions stored in the memory to perform control in such a way as to change an amount of light of illumination unit applying light to the target person when authentication of the target person fails. ### Claim 17 An imaging method comprising: controlling, in such a way as to fix a focal position in a predetermined position, an iris imaging unit capturing an image focusing on an iris of a target person; authenticating the target person, based on an iris image of the target person being captured by the controlled iris imaging unit; controlling the iris imaging unit in such a way as to scan a focal position in a predetermined range, in order to re-authenticate the target person when authentication of the target person fails; controlling in such a way as to fix the focal position when the target person is authenticated in a first authentication mode; and performing control in such a way as to scan the focal position when the target person is authenticated in a second authentication mode, wherein the first authentication mode is an authentication mode of authenticating the target person while moving, and the second authentication mode is an authentication mode of authenticating the target person while stopping. ### Claim 18 A non-transitory computer-readable medium configured to store an imaging program for causing a computer to execute processing of: controlling, in such a way as to fix a focal position in a predetermined position, an iris imaging unit capturing an image focusing on an iris of a target person; authenticating the target person, based on an iris image of the target person being captured by the controlled iris imaging unit; controlling the iris imaging unit in such a way as to scan a focal position in a predetermined range, in order to re-authenticate the target person when authentication of the target person fails; controlling in such a way as to fix the focal position when the target person is authenticated in a first authentication mode; and performing control in such a way as to scan the focal position when the target person is authenticated in a second authentication mode, wherein the first authentication mode is an authentication mode of authenticating the target person while moving, and the second authentication mode is an authentication mode of authenticating the target person while stopping.