Multi-Projector Geometric Correction via Reference Image Alignment
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Solution Overview
Problem
In multi-projection systems, correcting distortion across multiple projection images often results in increased misalignment and deterioration of image quality due to varying projector attitudes and lens distortions, making it challenging to maintain image quality.
Innovation Solution
A projection system that arranges n×m projectors in intersecting directions with overlapping projection areas, using a control unit to project reference images and perform geometric corrections based on user input, allowing for precise adjustment of distortion across adjacent images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If geometric correction is applied to the whole image made up of multiple projection images at a time, then the overall image alignment is improved, but the distortion at the joints between individual projection images increases and image quality deteriorates
Solution Approach 1:
The patent divides the correction process into two levels: first, individual geometric corrections are applied to each projection image separately using its own coordinate system, and then the corrected images are assembled into a composite image. This segmentation allows each projection image to be optimized independently, preventing joint distortion while maintaining overall alignment.
Solution Approach 2:
The patent applies different correction parameters to different regions by establishing individual coordinate systems for each projection image. Each projection image undergoes geometric correction tailored to its specific distortion characteristics, allowing local optimization of image quality without affecting adjacent regions negatively.
2Area of stationary object
If multiple projectors are used to form a composite projection image, then the coverage area is increased, but the distortion variation between individual projection images increases
Solution Approach 1:
The patent establishes a unified management system that handles multiple projection images with different coordinate systems. The image generation unit can process any number of projection images (first, second, and third projection images) using the same multi-coordinate system approach, making the solution universally applicable to multi-projection scenarios while maintaining distortion consistency.
3Manufacturing precision
If the positions of the four corners of the whole image are adjusted for correction, then the overall image distortion is reduced, but the misalignment at the joints between projection images increases
Solution Approach 1:
Instead of adjusting corner positions of the entire composite image, the patent segments the correction process by establishing individual coordinate systems for each projection image. Each image's corners are adjusted independently based on its own coordinate system, which prevents joint misalignment while still correcting overall distortion.
Data Source
AI summary
A projection system which arranges n×m projection images and forms one composite projection image on a projection surface includes: n×m projectors; an operation unit which accepts an operation by a user; and a control unit which controls the projection by each of the n×m projectors. The control unit causes a reference image showing a reference point common to a plurality of projection areas to be projected in an overlap area where the plurality of projection areas overlap each other, and causes each of a plurality of projectors projecting the projection image in the overlap are where the reference image to be moved is projected, to execute geometric correction of the projection image in such a way that the reference image moves to a position on the projection surface designated by the user by the operation via the operation unit, and to project the projection image.