Projector Geometric Correction Across Intersecting Surfaces
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Solution Overview
Problem
Existing projection technologies frequently switch distortion correction coefficients undesirably when projecting near the intersection of two surfaces, leading to unintended frequent changes.
Innovation Solution
Implement a method and projector that apply first and second geometric corrections based on specific angle ranges for different projection surfaces, adjusting the angle at which correction is switched to minimize frequent unintended changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If distortion correction coefficient is switched when projection angle crosses the intersection line of two projection receiving media, then correction accuracy for different surfaces is improved, but frequent unintended switches occur when projecting near the intersection line
Solution Approach 1:
The patent introduces a third range between the first and second ranges, creating a transition zone where the projection angle falls when moving from one surface to another. This parameter change approach allows the system to smoothly transition between correction coefficients without abrupt switches, reducing unintended frequency changes while maintaining correction accuracy across different projection surfaces
Solution Approach 2:
The patent makes the correction coefficient selection dynamic by introducing a third range that activates during transitions between surfaces. Instead of fixed threshold-based switching, the system dynamically adjusts which correction coefficient to apply based on the current projection angle's position relative to the intersection line, enabling smoother adaptation between different projection surfaces
Data Source
AI summary
A correction method includes applying first geometric correction for correcting distortion of an image to be projected from a projector onto a first projection surface when a projection angle that is an angle between horizontal plane and projection direction of projector is an angle within a first range; applying second geometric correction for correcting distortion of an image to be projected from projector onto a second projection surface that intersects with first projection surface when projection angle is an angle within a second range different from the first range; applying the first geometric correction when the projection angle changes from an angle within the first range to an angle within a third range that is a range between the first range and the second range; and applying the second geometric correction when the projection angle changes from an angle within the second range to an angle within the third range.