US 12,002,230 B2
Measurement method and measurement system
Taisuke Yamauchi, Matsumoto (JP)
Assigned to SEIKO EPSON CORPORATION, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Feb. 25, 2022, as Appl. No. 17/680,440.
Claims priority of application No. 2021-029751 (JP), filed on Feb. 26, 2021.
Prior Publication US 2022/0277466 A1, Sep. 1, 2022
Int. Cl. G06T 7/521 (2017.01); G01B 11/25 (2006.01)
CPC G06T 7/521 (2017.01) [G01B 11/2513 (2013.01); G01B 11/254 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A measurement method comprising:
determining a first vector representing a direction from a position of a measured portion that is one of a plurality of portions of a target surface to a position of a principal point of a first lens based on position information representing positions of the plurality of portions, a first image, and a first captured image generated when a first camera captures an image of the target surface in a situation in which a first projector projects the first image onto the target surface via the first lens;
determining a second vector representing a direction from the position of the measured portion to a position of a principal point of a second lens based on the position information, a second image, and a second captured image generated when the first camera captures an image of the target surface in a situation in which a second projector projects the second image onto the target surface via the second lens;
determining a third vector representing a direction from the position of the measured portion to a position of a principal point of a third lens based on the position information, a third image, and a third captured image generated when the first camera captures an image of the target surface in a situation in which a third projector projects the third image onto the target surface via the third lens; and
measuring a normal vector of the measured portion based on the first vector, the second vector, the third vector, a first value representing luminance of the measured portion in a situation in which the first projector projects a fourth image onto the target surface via the first lens, a second value representing the luminance of the measured portion in a situation in which the second projector projects a fifth image onto the target surface via the second lens, and a third value representing the luminance of the measured portion in a situation in which the third projector projects a sixth image onto the target surface via the third lens.