Projector Projection Region Mapping for Distortion-Corrected Image Area
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Solution Overview
Problem
Existing projector technologies do not effectively utilize the largest possible drawing region of the panel after distortion correction, limiting the effective use of the projection surface.
Innovation Solution
A method and apparatus that identify coordinates in a first coordinate system for the vertices of a quadrangle on the panel, determine the intersection coordinates of the quadrangle's diagonals, and identify a largest rectangle within a second quadrangle with a specific aspect ratio to define the projection region, ensuring effective use of the panel's drawing region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If distortion correction is applied to the projected image, then image distortion is corrected, but the effective use of the panel's drawing region is reduced
Solution Approach 1:
The patent applies preliminary distortion correction to the image before projection, rather than correcting the projected image afterward. By pre-processing the image data to account for expected projection distortions, the system maintains full utilization of the panel's drawing region while achieving distortion-free projection. This is accomplished by calculating correction coefficients based on the projection geometry and applying them to the image data prior to display on the panel.
2Area of stationary object
If the largest drawing region of the panel is used, then the projection coverage is maximized, but distortion correction cannot be effectively applied
Solution Approach 1:
The patent dynamically adjusts projection parameters including the projection region boundaries, distortion correction coefficients, and mapping relationships between panel coordinates and projection surface coordinates. By optimizing these parameters based on the specific projection geometry and panel characteristics, the system achieves both full drawing region utilization and effective distortion correction simultaneously.
Data Source
AI summary
A method for determining a projection region including identifying the coordinates that are in a screen coordinate system, for each of four vertices corresponding in a one-to-one relationship to four vertices of a rectangle that defines a drawing region of a panel, the screen coordinate system of a projection surface; identifying first intersection coordinates that are in the screen coordinate system and that are coordinates of a first intersection where the two diagonals of a quadrangle corresponding to the first quadrangle; identifying as a first rectangle a largest rectangle that falls within the quadrangle, has a center at the first intersection coordinates, and has a first aspect ratio; and determining the projection region of the projection surface based on the first rectangle.