Multi-Projector Video Alignment Using Camera Feedback
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Solution Overview
Problem
Existing video projection systems using multiple projectors struggle to smoothly switch video projections without causing a feeling of strangeness due to misalignment and brightness discrepancies at the overlap regions.
Innovation Solution
A video projection method and system that utilize two projectors with movable projection positions and a controller to adjust the resolution and brightness of the projected video in overlapping regions, using a projection transformation matrix to align the video projections accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple projectors are used to extend projection coverage, then the projection area is increased, but misalignment and brightness discrepancies occur at overlap regions
Solution Approach 1:
A camera is introduced as an intermediary device to capture the projection screens and detect marker positions. The camera provides objective measurement data that enables precise calculation of projection transformation matrices, resolving the alignment precision issue that arises when multiple projectors are used to expand the projection area.
Solution Approach 2:
The patent replaces manual or mechanical alignment methods with an automated vision-based system. The camera captures images, software detects marker positions, and algorithms automatically calculate transformation matrices, substituting mechanical adjustment processes with computational methods to achieve higher alignment precision.
2Area of stationary object
If multiple projectors project video simultaneously in overlapping regions, then coverage is extended, but brightness discrepancies and visual strangeness occur
Solution Approach 1:
The camera serves as an intermediary that objectively measures the actual projection positions and orientations. This measurement data enables the system to calculate appropriate brightness compensation factors for each projector's contribution to the overlap region, ensuring consistent perceived brightness across the entire projection area.
Solution Approach 2:
The system dynamically adjusts projection parameters including brightness levels based on the calculated transformation matrices. By changing the brightness parameter adaptively for each projector in the overlap region, the system maintains consistent illumination intensity and eliminates visual strangeness while preserving extended projection coverage.
3Area of stationary object
If projection position is moved to expand coverage, then the projection area is increased, but alignment accuracy deteriorates at overlap regions
Solution Approach 1:
The camera acts as an intermediary measurement device that captures the actual projection positions on the screens. This objective visual data enables precise detection of marker positions and calculation of transformation matrices, maintaining high alignment precision even when projection positions are moved to expand the overall projection area.
Solution Approach 2:
The system uses the camera to continuously monitor and detect the actual projection positions, providing feedback information for calculating transformation matrices. This feedback mechanism ensures that alignment precision is maintained by constantly adjusting based on measured positions rather than relying solely on predetermined settings.
Data Source
AI summary
A video projection method of the present disclosure is a video projection method by a video projection system including a first projector, a second projector, and a controller that transmits video data to the first projector and the second projector. The first projector projects first projection video whose projection position moves in a first region based on the video data transmitted from the controller, the second projector projects second projection video onto a second region based on the video data transmitted from the controller, and at least one of resolution and brightness of the first projection video is adjusted in a superimposed region where the first region and the second region overlap.