Projector-Camera Geometry Correction for Curved Screen Distortion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional projection-type image display apparatuses fail to adequately correct geometric distortion on irregular or free-form surfaces, necessitating labor-intensive adjustments with separate cameras.
Innovation Solution
An image display apparatus with a built-in camera and projection lens system that performs geometric transformation to correct distortion on curved surfaces by calculating a transformation matrix based on captured images, eliminating the need for separate camera installations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a separate camera is installed at the viewpoint position to capture the projected image for distortion correction, then geometric distortion correction is achieved, but device complexity and installation labor increase
Solution Approach 1:
The patent merges the camera function into the projector body, making the camera and projector a single integrated device. This eliminates the need for separate camera installation while maintaining the capability to capture the projected image for distortion correction. The camera and projection lens are positioned at predetermined locations within the same housing,实现ing both image projection and capture functions in one device.
Solution Approach 2:
The integrated device serves multiple functions: it projects images onto the screen and simultaneously captures the projected image to analyze and correct geometric distortion. This multi-functionality eliminates the need for separate dedicated camera equipment, reducing device complexity while maintaining correction capabilities.
2Measurement precision
If a separate camera is installed to capture images for distortion correction, then accurate distortion measurement is achieved, but ease of operation deteriorates due to labor-intensive setup
Solution Approach 1:
By integrating the camera within the projector body at a predetermined position, the system eliminates the manual setup and positioning of a separate camera. The camera is pre-configured to work with the projection lens, automatically capturing the projected image for distortion analysis without requiring user intervention for alignment or installation.
Solution Approach 2:
The system performs self-measurement of geometric distortion by using its own integrated camera to capture the projected image. The device automatically processes the captured image to calculate distortion characteristics, eliminating the need for external equipment or manual measurement procedures.
3Manufacturing precision
If the camera is positioned at the viewpoint position to capture the image, then accurate user perspective distortion correction is achieved, but device complexity increases
Solution Approach 1:
The camera is integrated into the projector body at a predetermined position that corresponds to the user's viewpoint. This merging of functions allows the system to capture images from the same perspective as the user would see the projection, enabling accurate viewpoint-based distortion correction without requiring a separate camera positioned at the user's location.
Data Source
AI summary
A technology capable of suitably correcting a geometric distortion caused by a shape of a curved surface of a screen or the like and obtaining a suitable image easily viewable for a user is provided. A projector is an image display apparatus configured to project an image onto a screen and includes a projection lens arranged at a first position and a camera arranged at a second position. 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, and a geometric transformation for correcting a geometric distortion caused by the curved surface seen from a first virtual viewpoint position (virtual viewpoint) 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.