US-12621416-B2 - Projection image adjustment method, information processing apparatus, and non-transitory computer-readable storage medium storing program

US12621416B2US 12621416 B2US12621416 B2US 12621416B2US-12621416-B2

Abstract

A projection image adjustment method includes acquiring first captured image by capturing image of first image projected at first position on projection surface and second image projected at second position on projection surface and at least partially overlapping with first image, acquiring first amount of shift between first image and second image based on first captured image, moving first image from first position to third position separate therefrom in first direction, acquiring second captured image by capturing image of first image projected at third position and second image projected at second position, acquiring second amount of shift between first image and second image based on second captured image, and moving second image from second position to a fourth position separate therefrom in a second direction that is the opposite direction of the first direction when the second amount of shift is smaller than the first amount of shift.

Inventors

Takuo YONEYAMA

Assignees

SEIKO EPSON CORPORATION

Dates

Publication Date: 20260505
Application Date: 20240329
Priority Date: 20230330

Claims (10)

1 . A projection image adjustment method comprising: acquiring a first captured image from a camera by causing the camera to capture an image of a projection surface with a first image projected by a first projector at a first position on the projection surface and a second image projected by a second projector at a second position on the projection surface and at least partially overlapping with the first image; acquiring, based on the first captured image, a first amount of shift along a first axis between the first image and the second image, the first axis being a coordinate axis of a global coordinate system; causing the first projector to move the first image from the first position to a third position separate therefrom by a first distance in a first direction corresponding to a direction toward one end of the first axis; acquiring a second captured image from the camera by causing the camera to capture an image of the projection surface with the first image projected by the first projector at the third position and the second image projected by the second projector at the second position; acquiring, based on the second captured image, a second amount of shift along the first axis between the first image and the second image; and causing the second projector to move the second image from the second position to a fourth position separate therefrom by a second distance in a second direction that is an opposite direction of the first direction when the second amount of shift is smaller than the first amount of shift.
2 . The projection image adjustment method according to claim 1 , further comprising causing the first projector to move the first image from the third position to a fifth position separate therefrom by a third distance in the second direction when the second amount of shift is greater than the first amount of shift.
3 . The projection image adjustment method according to claim 2 , further comprising: acquiring a third captured image from the camera by causing the camera to capture an image of the projection surface with the first image projected by the first projector at the fifth position and the second image projected by the second projector at the second position; acquiring, based on the third captured image, a third amount of shift along the first axis between the first image and the second image; and causing the first projector to move the first image from the fifth position to a sixth position separate therefrom by a fourth distance in the second direction when the third amount of shift is smaller than the second amount of shift.
4 . The projection image adjustment method according to claim 3 , further comprising: acquiring a fourth captured image from the camera by causing the camera to capture an image of the projection surface with the first image projected by the first projector at the sixth position and the second image projected by the second projector at the second position; acquiring, based on the fourth captured image, a fourth amount of shift along the first axis between the first image and the second image; and causing the second projector to move the second image from the second position to a seventh position separate therefrom by a fifth distance in the first direction when the fourth amount of shift is smaller than the third amount of shift.
5 . The projection image adjustment method according to claim 1 , further comprising causing the second projector to move the second image from the second position to a ninth position separate therefrom by a seventh distance in the first direction when the second amount of shift is greater than the first amount of shift.
6 . The projection image adjustment method according to claim 1 , further comprising acquiring a fifth amount of shift along a second axis between the first image and the second image, the second axis being perpendicular to the first axis, based on the first captured image before causing the first projector to move the first image from the first position to the third position, wherein the first projector moves the first image from the first position to the third position when the first amount of shift is greater than the fifth amount of shift.
7 . The projection image adjustment method according to claim 1 , wherein a position of the first image projected onto the projection surface changes in accordance with a position of a first projection lens provided in the first projector, and causing the first projector to move the first image to the third position includes changing the position of the first projection lens to move the first image from the first position to the third position.
8 . The projection image adjustment method according to claim 1 , wherein the first image corresponds to a first panel image displayed in a display region of a first panel provided in the first projector, and causing the first projector to move the first image from the first position to the third position includes changing a position where the first panel image is displayed in the display region of the first panel to move the first image from the first position to the third position.
9 . An information processing apparatus comprising one or more processors that acquire a first captured image from a camera by causing the camera to capture an image of a projection surface with a first image projected by a first projector at a first position on the projection surface and a second image projected by a second projector at a second position on the projection surface and at least partially overlapping with the first image, acquire, based on the first captured image, a first amount of shift along a first axis between the first image and the second image, the first axis being a coordinate axis of a global coordinate system, cause the first projector to move the first image from the first position to a third position separate therefrom by a first distance in a first direction corresponding to a direction toward one end of the first axis, acquire a second captured image from the camera by causing the camera to capture an image of the projection surface with the first image projected by the first projector at the third position and the second image projected by the second projector at the second position, acquire, based on the second captured image, a second amount of shift along the first axis between the first image and the second image, and cause the second projector to move the second image from the second position to a fourth position separate therefrom by a second distance in a second direction that is an opposite direction of the first direction when the second amount of shift is smaller than the first amount of shift.
10 . A non-transitory computer-readable storage medium storing a program that causes a computer to acquire a first captured image from a camera by causing the camera to capture an image of a projection surface with a first image projected by a first projector at a first position on the projection surface and a second image projected by a second projector at a second position on the projection surface and at least partially overlapping with the first image, acquire, based on the first captured image, a first amount of shift along a first axis between the first image and the second image, the first axis being a coordinate axis of a global coordinate system, cause the first projector to move the first image from the first position to a third position separate therefrom by a first distance in a first direction corresponding to a direction toward one end of the first axis, acquire a second captured image from the camera by causing the camera to capture an image of the projection surface with the first image projected by the first projector at the third position and the second image projected by the second projector at the second position, acquire, based on the second captured image, a second amount of shift along the first axis between the first image and the second image, and cause the second projector to move the second image from the second position to a fourth position separate therefrom by a second distance in a second direction that is an opposite direction of the first direction when the second amount of shift is smaller than the first amount of shift.

Description

The present application is based on, and claims priority from JP Application Serial Number 2023-054896, filed Mar. 30, 2023, the disclosure of which is hereby incorporated by reference herein in its entirety. BACKGROUND 1. Technical Field The present disclosure relates to a projection image adjustment method, a projection system, an information processing apparatus, and a non-transitory computer-readable storage medium storing a program. 2. Related Art JP-A-2021-061510 discloses a technology for detecting the amount and direction of pixel shift between a plurality of projection images projected by the plurality of projectors to overlap with each other. The technology includes capturing overlapping regions where a plurality of projection images overlap with each other to acquire captured images, applying two-dimensional Fourier transform to the captured images to produce frequency spectrum images, and detecting the amount and direction of pixel shift based on the frequency spectrum images. JP-A-2021-061510 is an example of the related art. The technology disclosed in JP-A-2021-061510 can detect the amount and direction of the relative pixel shift between the plurality of projection images, but cannot determine which projection image is shifted in which direction. In other words, the technology disclosed in JP-A-2021-061510 cannot detect the absolute pixel shift direction in each of the projection images. Furthermore, JP-A-2021-061510 does not specifically describe how to correct the pixel shift between the plurality of projection images only with the aid of the known amount and direction of the relative pixel shift. It is therefore difficult to correct the pixel shift between the plurality of projection images overlapping with each other based on the technical content disclosed in JP-A-2021-061510. SUMMARY A projection image adjustment method according to an aspect of the present disclosure includes acquiring a first captured image from a camera by causing the camera to capture an image of a projection surface with a first image projected by a first projector at a first position on the projection surface and a second image projected by a second projector at a second position on the projection surface and at least partially overlapping with the first image, acquiring, based on the first captured image, a first amount of shift along a first axis between the first image and the second image, the first axis being a coordinate axis of a global coordinate system, causing the first projector to move the first image from the first position to a third position separate therefrom by a first distance in a first direction corresponding to a direction toward one end of the first axis, acquiring a second captured image from the camera by causing the camera to capture an image of the projection surface with the first image projected by the first projector at the third position and the second image projected by the second projector at the second position, acquiring, based on the second captured image, a second amount of shift along the first axis between the first image and the second image, and causing the second projector to move the second image from the second position to a fourth position separate therefrom by a second distance in a second direction that is an opposite direction of the first direction when the second amount of shift is smaller than the first amount of shift. A projection system according to another aspect of the present disclosure includes a first projector that projects a first image onto a projection surface, a second projector that projects a second image onto the projection surface, and a camera that captures an image of the projection surface, the first projector including a processing apparatus that acquires a first captured image from the camera by causing the camera to capture an image of the projection surface with the first image projected by the first projector at a first position on the projection surface and the second image projected by the second projector at a second position on the projection surface and at least partially overlapping with the first image, acquires, based on the first captured image, a first amount of shift along a first axis between the first image and the second image, the first axis being a coordinate axis of a global coordinate system, causes the first projector to move the first image from the first position to a third position separate therefrom by a first distance in a first direction corresponding to a direction toward one end of the first axis, acquires a second captured image from the camera by causing the camera to capture an image of the projection surface with the first image projected by the first projector at the third position and the second image projected by the second projector at the second position, acquires, based on the second captured image, a second amount of shift along the first axis between the first image and the second image, and causes th