Patent ID: 11898838
Assignee: SEIKO EPSON CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 6:
7. A measurement method comprising:
identifying correspondence between a projector coordinate system indicating a position in a first image and a camera coordinate system indicating a position in a first captured image based on the first image and the first captured image, the first captured image being produced by causing a first camera to capture an image of a projection receiving object with the first image projected thereon from a projector;
detecting brightness of a first area of a second captured image and brightness of a second area of the second captured image produced by causing the first camera to capture an image of the projection receiving object with a second image projected thereon from the projector;
estimating, for a third area of the second image that is an area associated with the first area in accordance with the correspondence, a range of first brightness that causes the brightness of the first area not to reach an upper and lower saturation point based on the detected brightness of the first area and brightness of the third area;
estimating, for a fourth area of the second image that is an area associated with the second area in accordance with the correspondence, a range of second brightness that causes the brightness of the second area not to reach an upper and lower saturation point based on the detected brightness of the second area and brightness of the fourth area;
adjusting brightness of a fifth area corresponding to the third area in a projection image projected form the projector so as to fall within the range of the first brightness and adjusting brightness of a sixth area corresponding to the fourth area in the projection image so as to fall within the range of the second brightness; and
measuring a three-dimensional shape of the projection receiving object based on the projection image and a third captured image produced by causing the first camera to capture an image of the projection receiving object with the projection image projected thereon.