US 12,075,186 B2
Image display apparatus and method
Kazuhiko Tanaka, Tokyo (JP); Mitsuo Nakajima, Kyoto (JP); and Haruhiko Higuchi, Tokyo (JP)
Assigned to MAXELL, LTD., Kyoto (JP)
Appl. No. 17/422,909
Filed by MAXELL, LTD., Kyoto (JP)
PCT Filed Dec. 18, 2019, PCT No. PCT/JP2019/049520
§ 371(c)(1), (2) Date Jul. 14, 2021,
PCT Pub. No. WO2020/153051, PCT Pub. Date Jul. 30, 2020.
Claims priority of application No. 2019-009015 (JP), filed on Jan. 23, 2019.
Prior Publication US 2022/0132071 A1, Apr. 28, 2022
Int. Cl. H04N 5/74 (2006.01); G03B 21/14 (2006.01)
CPC H04N 5/7408 (2013.01) [G03B 21/147 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An image display apparatus configured to project an image onto a screen, comprising:
a projection lens arranged at a first position; and
a camera arranged at a second position,
wherein, when the screen has a curved surface, a camera image obtained by capturing a first image projected on the screen by the camera is acquired,
wherein a geometric transformation for correcting a geometric distortion caused by the curved surface seen from a first virtual viewpoint position is performed for an image to be displayed based on information of the camera image, the first position, and the second position, and a post-transformation image is projected onto the screen,
wherein each point of a grid of a projected image on the screen is calculated by using the first image and the camera image,
wherein a distance from the first position to each point of the grid is calculated,
wherein a transformation matrix for correcting the geometric distortion caused by the curved surface seen from the first virtual viewpoint position is calculated by using the grid and the distance, and
wherein the geometric transformation is performed by using the transformation matrix.