Dynamic Keystone Correction for Projectors on Irregular Surfaces
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Solution Overview
Problem
Current keystone correction methods fail to dynamically adjust projected images effectively when the projector's central axis is not normal to the surface, especially on surfaces with varying textures and non-co-planar sub-surfaces, leading to distortion.
Innovation Solution
An apparatus and method that measure distances and calculate actual vector ratios of projected image points, adjusting the aspect ratio dynamically to match a target ratio, using a measurement module and adjustment module to correct keystone distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the projector is positioned at an angle to the surface, then the projector can reach difficult-to-access surfaces, but the projected image becomes distorted due to keystone effect
Solution Approach 1:
The system dynamically adjusts the aspect ratio of the projected image based on real-time measurement of the surface geometry. The correction factors are continuously updated as the projector moves or as different surfaces are detected, allowing the system to maintain image accuracy while adapting to various projection angles and surface configurations.
Solution Approach 2:
The system changes the geometric parameters of the projected image by adjusting the aspect ratio dynamically. Based on measured distances to multiple points on the surface, the system calculates correction factors and modifies the image dimensions to compensate for keystone distortion, transforming the image geometry to match the target surface.
2Adaptability or versatility
If the surface has varying textures and non-co-planar sub-surfaces, then the projector can accommodate diverse surface types, but the image distortion increases due to irregular surface geometry
Solution Approach 1:
The system divides the projection surface into multiple measurement zones by selecting at least three distinct points on the surface. By measuring distances to each point independently and calculating correction factors for each region, the system can handle non-co-planar sub-surfaces and varying textures through localized geometric correction.
Solution Approach 2:
The system uses measured distance data from the surface to provide feedback for continuous adjustment of the aspect ratio. The measurement results directly inform the correction calculations, creating a closed-loop system that adapts to actual surface conditions rather than relying on pre-programmed surface models.
3Manufacturing precision
If the aspect ratio is adjusted dynamically to correct distortion, then image accuracy improves, but the system complexity increases due to additional measurement and calculation requirements
Solution Approach 1:
The projector system performs its own surface measurement and self-corrects its projected image without requiring external calibration equipment or manual intervention. The system uses its own projection capability to measure surface geometry and automatically adjusts its output parameters, eliminating the need for separate complex calibration systems.
Data Source
AI summary
An apparatus and method are disclosed for dynamic keystone correction. A measurement module measures distances from a projector to each of at least three projected points of a first projected image projected on a first surface with projection angles between each projected point. The at least three projected points are endpoints for at least two vectors with a target ratio of vector lengths. An adjustment module calculates an actual ratio of actual vector lengths of the at least two vectors. The adjustment module further adjusts a first aspect ratio of first projected image until the actual ratio is equivalent to the target ratio.