Projection Apparatus Viewpoint Correction for Full-Spherical Distortion
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Solution Overview
Problem
Full-spherical-type projection apparatuses often project distorted images, especially at corners where walls intersect, due to the mismatch between the projection lens position and the viewer's viewpoint when displaying images on multiple surfaces like ceilings, walls, and floors.
Innovation Solution
A projection apparatus comprising a projection unit, a surface information obtaining unit, a viewpoint information obtaining unit, and a processor that generates viewpoint correction matrices and correction mask data to adjust the image projection, ensuring a natural and undistorted view from any viewpoint by performing conversion calculations on each projection surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an image is projected on multiple surfaces (ceiling, walls, floor) using a full-spherical-type projection apparatus, then the coverage area and viewing versatility are improved, but image distortion occurs especially at corners where walls intersect due to the mismatch between projection lens position and viewer's viewpoint
Solution Approach 1:
The projection system divides the full-spherical projection space into multiple discrete projection surfaces (ceiling, walls, floor). Each surface is processed independently with its own viewpoint correction matrix, allowing precise control of image geometry on each surface while maintaining overall spherical coverage
Solution Approach 2:
Different viewpoint correction matrices are applied to different projection surfaces based on their specific geometric relationships to the viewer's viewpoint. Each surface receives customized correction parameters tailored to its location and orientation, eliminating distortion at corners and intersections while preserving the multi-surface projection capability
2Ease of operation
If the projection lens is fixed at a specific position for full-spherical projection, then the device complexity is reduced and ease of operation is improved, but the mismatch between lens position and viewer's viewpoint causes image distortion
Solution Approach 1:
The system performs preliminary calculation and storage of viewpoint correction matrices for multiple predetermined viewer positions around the projection apparatus. When projection begins, the appropriate pre-calculated matrices are automatically selected and applied, eliminating the need for real-time adjustment while ensuring accurate viewpoint alignment
Solution Approach 2:
The system dynamically changes the parameters of the viewpoint correction matrices based on the detected or selected viewer position. By adjusting the correction parameters according to the viewer's location, the system maintains undistorted images across different viewing angles while keeping the physical projection lens fixed
Data Source
AI summary
A projection apparatus includes a matrix expression generation unit which generates viewpoint correction matrices used for a conversion calculation on each of the projection surfaces for an image to be projected, a mask generation unit which generates correction mask data indicating regions corresponding to the viewpoint correction matrices generated by the matrix expression generation unit for the image, and a projection control unit which executes the conversion calculation on the image using each viewpoint correction matrix generated for each corresponding region in the correction mask data generated by the mask generation unit, and thereafter controls the projection unit to project the image.