Multi-Projector Stack Projection Evaluation via Temporal Segmentation
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Solution Overview
Problem
In image projection systems using multiple projectors for stack projection, it is difficult to identify which projector needs adjustment as the images overlap, making it challenging to determine if one projector requires color adjustment.
Innovation Solution
An evaluation method involving a camera captures images at different timings to compare the projection states of projectors, determining if adjustments are needed based on differences in color values between captured images, with processors controlling the projectors to switch between projection-on and projection-off states to evaluate the need for adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple projectors perform stack projection simultaneously, then the projection coverage area is expanded, but it becomes difficult to identify which projector needs adjustment
Solution Approach 1:
The patent divides the simultaneous projection evaluation into sequential temporal segments. By controlling projectors to operate in different time slots (first projector at first timing, second projector at second timing), the system segments the evaluation process so that each projector can be individually assessed without visual interference from others, thus resolving the identification difficulty while maintaining expanded coverage capability
Solution Approach 2:
The patent implements periodic action by having projectors alternate their operation in a cyclic manner. The first projector projects at a first timing while the second projector projects at a second timing, creating a periodic evaluation rhythm that allows individual projector assessment. This periodic switching enables clear identification of which projector needs adjustment while preserving the overall multi-projector coverage advantage
2Illumination intensity
If images from multiple projectors are superimposed, then the visual coverage is enhanced, but the ability to measure and evaluate individual projector performance deteriorates
Solution Approach 1:
The patent segments the measurement process temporally by evaluating each projector's image separately at different timings. The first projector's image is captured at a first timing when other projectors are not projecting, and the second projector's image is captured at a second timing. This temporal segmentation eliminates image superimposition during measurement, ensuring high measurement precision for each projector while maintaining the visual coverage enhancement benefit
Solution Approach 2:
The patent uses periodic action by alternating the projection timing between different projectors. During the first timing, the first projector projects while others remain idle; during the second timing, the second projector projects while others are idle. This periodic switching ensures that each projector's image is measured independently without superimposition, achieving precise measurement while preserving the enhanced visual coverage capability when all projectors operate together
Data Source
AI summary
An evaluation method for an image projection system in which a first projector, a second projector, and a third projector perform stack projection on a screen, the method including acquiring a first image generated by capturing the screen at a first timing, acquiring a second image generated by capturing the screen at a second timing, causing the projection state of the first projector to differ from the projection states of the second projector and the third projector at the first timing, and evaluating whether or not the first projector needs to be adjusted based on the first image and the second image.