US 11,698,575 B2
Projective transformation matrix determination method, projector, and determination system
Hiroki Senshiki, Shiojiri (JP)
Assigned to Seiko Epson Corporation, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Nov. 2, 2021, as Appl. No. 17/516,782.
Claims priority of application No. 2020-183521 (JP), filed on Nov. 2, 2020.
Prior Publication US 2022/0137494 A1, May 5, 2022
Int. Cl. G03B 21/14 (2006.01); H04N 9/31 (2006.01); G06T 7/73 (2017.01)
CPC G03B 21/142 (2013.01) [G03B 21/147 (2013.01); G06T 7/73 (2017.01); H04N 9/3185 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A projective transformation matrix determination method comprising:
receiving a change instruction to change a positional relationship among four feature points in a situation in which a projector projects a first projection image showing the four feature points onto a first area;
causing the projector to project a second projection image showing the four feature points onto the first area in response to the change instruction, the positional relationship among the four feature points in the second projection image differs from the positional relationship among the four feature points in the first projection image; and
determining a projective transformation matrix based on coordinates of the four feature points in the second projection image and coordinates of the four feature points in a first captured image generated by capturing, with a camera, an image of the first area where the second projection image is projected, the projective transformation matrix associating a projector coordinate system which defining coordinates in a projection image projected by the projector with a camera coordinate system defining coordinates in a captured image generated by the camera.