Projector Overlap Brightness Correction for Uniform Projection
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Solution Overview
Problem
Existing projection systems fail to effectively address the issue of brightness differences between overlap and non-overlap regions on a projection surface when the non-overlap region is brighter than the overlap region, leading to an undesirable increase in luminance and noticeable brightness differences.
Innovation Solution
A projection system that includes a first and second projector, a camera, and a processing apparatus to capture and analyze the brightness of overlapping and non-overlapping regions, adjusting the images only when the non-overlap region is darker than the overlap region to prevent further luminance increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If correction is performed to increase the highest luminance at the non-overlap region when it is darker than the overlap region, then brightness uniformity is improved, but when the non-overlap region is already brighter than the overlap region, the correction causes a more noticeable difference in brightness
Solution Approach 1:
The patent inverts the conventional correction approach by determining whether correction should be applied based on the brightness relationship between non-overlap and overlap regions. When the non-overlap region is brighter than the overlap region, the patent applies inverse correction to reduce brightness at the non-overlap region rather than increasing it, thereby eliminating the harmful brightness difference without creating new issues.
Solution Approach 2:
The patent changes the correction parameter dynamically based on the detected brightness relationship. The processing apparatus adjusts the correction amount and direction (increase or decrease luminance) according to whether the non-overlap region is darker or brighter than the overlap region, enabling adaptive brightness uniformity correction that prevents noticeable differences in all cases.
2Illumination intensity
If correction is always applied to equalize brightness between non-overlap and overlap regions, then brightness uniformity is improved, but the correction process increases complexity
Solution Approach 1:
The patent introduces dynamic correction control where the correction process adapts its behavior based on real-time brightness detection. The processing apparatus determines the correction strategy (apply correction, inverse correction, or no correction) dynamically according to the brightness relationship between regions, simplifying the overall control logic while maintaining effective brightness uniformity.
Solution Approach 2:
The patent implements a feedback mechanism where the processing apparatus continuously monitors the brightness relationship between non-overlap and overlap regions using captured images. Based on this feedback, the system automatically adjusts the correction process, eliminating the need for complex manual control while ensuring brightness uniformity is maintained without creating new problems.
Data Source
AI summary
A projection image adjustment method includes acquiring a captured image produced by capturing an image of a range containing a first and second region in a situation wherein a first projector projects a first image having uniform luminance toward a first region and a second projector projects a second image having uniform luminance toward a second region overlapping part of the first region, identifying based on the captured image the brightness at a third region where the first region and the second region overlap each other, and the brightness at a fourth region that is part of the first region and does not overlap with the second region, adjusting the first image when the fourth region is darker than the third region, and not performing correction that adjusts the first image to increase the highest brightness at the fourth region when the fourth region is brighter than the third region.