Projector Distortion Correction via Asymmetric Point Distribution
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Solution Overview
Problem
Existing projectors face challenges in efficiently correcting distortions caused by oblique projection light and surface irregularities, such as recesses or projections, which increase the complexity and time required for correction, especially in ultra short focus projectors where distortions become more pronounced.
Innovation Solution
A method and apparatus where a correction image with a higher number of correction points is projected on the side of a rectangular correction image touching the vertex farthest from the projection lens, allowing for targeted distortion correction by moving specific correction points, thereby reducing the overall complexity and time needed for correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a large number of correction points are arranged throughout the entire correction image to correct distortion caused by recesses or projections on the projection surface, then the distortion correction precision is improved, but the trouble and time required for correction increase
Solution Approach 1:
The patent applies local quality by arranging a larger number of correction points on the first side (touching the vertex farthest from the projection lens) compared to the second side. This non-uniform distribution focuses correction resources on the side where distortion is most pronounced, achieving effective distortion correction while reducing the total number of correction points needed compared to uniform distribution across the entire image.
Solution Approach 2:
The patent employs asymmetry by creating an uneven distribution of correction points across different sides of the correction image. Specifically, more correction points are placed on the first side than on the second side, matching the asymmetric nature of distortion in ultra short focus projectors where the vertex farthest from the lens experiences greater distortion. This asymmetric arrangement optimizes correction effectiveness while minimizing correction complexity.
2Manufacturing precision
If a large number of correction points are arranged throughout the entire correction image to correct distortion caused by recesses or projections on the projection surface, then the distortion correction precision is improved, but the complexity of correction operation increases
Solution Approach 1:
The patent applies local quality by concentrating more correction points on the first side where distortion is most significant, rather than uniformly distributing points across the entire image. This localized approach maintains high correction precision in critical areas while reducing the total number of points users must manually adjust, thereby simplifying the correction operation.
Solution Approach 2:
The patent applies partial action by focusing correction efforts on specific regions (the first side with higher distortion) rather than treating the entire image uniformly. This selective approach applies sufficient correction where needed while avoiding unnecessary correction operations in areas with less distortion, reducing overall operational complexity.
3Productivity
If ultra short focus projector is used to project a large image in a short projection distance, then the productivity is improved, but the distortion in the output image caused by recess or projection on the projection surface becomes conspicuous
Solution Approach 1:
The patent applies local quality by implementing a non-uniform correction point distribution that concentrates more points on the first side (touching the vertex farthest from the projection lens). This approach provides enhanced correction precision in the regions where ultra short focus projection causes the most significant distortion, thereby maintaining output image quality while preserving the productivity benefits of short projection distance.
Solution Approach 2:
The patent applies parameter changes by modifying the density and distribution parameters of correction points across different regions of the correction image. By varying the number of correction points per side based on distortion characteristics, the system optimizes the balance between projection efficiency and image quality for ultra short focus applications.
Data Source
AI summary
A projector has a projection optical system including a projection lens and a processing device. The processing device makes the projection optical system project a correction image having a rectangular shape. The number of correction points arranged on a first side out of two sides connecting to a vertex located the farthest from the projection lens when projected on a projection surface out of four vertexes of the correction image is larger than the number of correction points arranged on a side different from the two sides. The processing device receives an operation of moving first correction point included in the correction points arranged on the first side, and makes the projection optical system project an output image obtained by applying a distortion correction based on the operation to an input image.