# US 11,451,755 B2 · Method for controlling electronic instrument and electronic instrument > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,451,755 B2 - Document ID: US11451755B2 - Status: Granted - Kind: B2 - Application number: 17/185,267 - Filed: 2021-02-25 - Published: 2021-08-26 - Granted: 2022-09-20 - Earliest claimed: 2020-02-26 - Assignees: Seiko Epson Corporation - Applicants: Seiko Epson Corporation - Inventors: Taisuke Yamauchi - Web page: https://patentgrep.com/patent/US11451755B2 ## CPC - H04N 9/317: {Convergence or focusing systems (electronic adjustment of convergence H04N9/3185; convergence or focusing arrangements for cathode ray tubes H04N9/28; means for automatic focusing of projectors not peculiar to the presence of an electronic spatial light modulator G03B21/53)} - H04N 9/3194: {including sensor feedback} - G01B 11/2504: {Calibration devices} - G06T 7/70: Determining position or orientation of objects or cameras (camera calibration G06T7/80) - H04N 9/3179: {Video signal processing therefor} - H04N 9/3191: {Testing thereof (testing of displays in general G09G3/006)} - G01B 11/2527: {with phase change by in-plane movement of the patern} - G01B 11/2536: {using several gratings with variable grating pitch, projected on the object with the same angle of incidence} - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS - G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL ## Abstract A method for controlling an electronic instrument including a projection section that projects an image via a projection lens and an imaging section that performs imaging via an imaging lens includes causing a first storage to store first characteristic data representing the characteristics of the projection lens, second characteristic data representing the characteristics of the imaging lens, and arrangement data representing the arrangement of the projection lens and the imaging lens and then causing the projection section to project a pattern image on an object via the projection lens, causing the imaging section to capture an image of the pattern image on the object via the imaging lens to generate captured image data, and updating the arrangement data based on the captured image data, the first characteristic data, and the second characteristic data without updating the first characteristic data and the second characteristic data. ## Claims ### Claim 1 A method for controlling an electronic instrument including a projection section that projects an image via a projection lens and an imaging sensor that performs imaging via an imaging lens, the method comprising: causing a first storage to store first characteristic data representing characteristics of the projection lens, second characteristic data representing characteristics of the imaging lens, and arrangement data representing arrangement of the projection lens and the imaging lens and then causing the projection section to project a pattern image on an object via the projection lens; causing the imaging sensor to capture an image of the pattern image on the object via the imaging lens to generate captured image data; and updating the arrangement data stored by the first storage based on the captured image data, the first characteristic data stored by the first storage, and the second characteristic data stored by the first storage without updating the first characteristic data stored by the first storage and the second characteristic data stored by the first storage, wherein: part of the pattern image represents a predetermined image, the captured image data represents a captured image representing the predetermined image on the object, a position of the predetermined image in the captured image is identified based on the captured image data, a second storage stores position data representing the position of the predetermined image in the capture image, and the first characteristic data stored by the first storage and the second characteristic data stored by the first storage is not updated, but the arrangement data stored by the first storage is updated based on the position data stored by the second storage, the first characteristic data stored by the first storage, and the second characteristic data stored by the first storage. ### Claim 2 (depends on 1) The control method according to claim 1, wherein the projection lens is a zoom lens, the first characteristic data represents characteristics of the zoom lens when a principal point of the zoom lens is located in a predetermined position, the arrangement data represents the arrangement of the zoom lens and the imaging lens when the principal point of the zoom lens is located in the predetermined position, and the projection section projects the pattern image on the object via the zoom lens in a situation in which the principal point of the zoom lens is located in the predetermined position. ### Claim 3 (depends on 2) The control method according to claim 2, wherein a focal length of the zoom lens is changeable over a range from a first focal length to a second focal length, and the predetermined position is any of the position of the principal point of the zoom lens when the focal length is the first focal length, the position of the principal point of the zoom lens when the focal length is the second focal length, and the position of the principal point of the zoom lens when the focal length differs from both the first focal length and the second focal length. ### Claim 4 (depends on 2) The control method according to claim 2, wherein it is evaluated whether or not the principal point of the zoom lens is located in the predetermined position, and the projection section projects the pattern image on the object via the zoom lens when it is determined that the principal point of the zoom lens is located in the predetermined position. ### Claim 5 (depends on 1) The control method according to claim 1, wherein the first characteristic data stored by the first storage and the second characteristic data stored by the first storage is not updated when an update instruction of update of the arrangement data is received, but the arrangement data stored by the first storage is updated based on the position data stored by the second storage, the first characteristic data stored by the first storage, and the second characteristic data stored by the first storage. ### Claim 6 (depends on 1) The control method according to claim 1, wherein when a predetermined period elapses after the position data is stored in the second storage, the position data is deleted from the second storage. ### Claim 7 (depends on 1) The control method according to claim 1, wherein when the number of actions of the update operation performed after the position data is stored in the second storage exceeds a predetermined number, the position data is deleted from the second storage. ### Claim 8 An electronic instrument comprising: a projection section that projects a pattern image on an object via a projection lens after a first storage stores first characteristic data representing characteristics of the projection lens, second characteristic data representing characteristics of an imaging lens, and arrangement data representing arrangement of the projection lens and the imaging lens; an imaging sensor that captures an image of the pattern image on the object via the imaging lens to generate captured image data; and one or more processors that do not update the first characteristic data stored by the first storage and the second characteristic data stored by the first storage but update the arrangement data stored by the first storage based on the captured image data, the first characteristic data stored by the first storage, and the second characteristic data stored by the first storage, wherein: part of the pattern image represents a predetermined image, the captured image data represents a captured image representing the predetermined image on the object, a position of the predetermined image in the captured image is identified based on the captured image data, a second storage stores position data representing the position of the predetermined image in the capture image, and the first characteristic data stored by the first storage and the second characteristic data stored by the first storage is not updated, but the arrangement data stored by the first storage is updated based on the position data stored by the second storage, the first characteristic data stored by the first storage, and the second characteristic data stored by the first storage.