Projector Image Distortion Correction on Curved Surfaces
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Solution Overview
Problem
Existing projector technologies face distortion issues when projecting images onto non-planar or curved surfaces due to measurement errors in specifying lattice points, leading to inaccurate correction of image distortion.
Innovation Solution
A control method for projectors that projects a shape determination image and a lattice image onto a surface to determine its three-dimensional shape, accurately specify lattice points, and generate correction data to correct image distortion, ensuring a precise and undistorted projection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If lattice points are specified from imaging data to correct image distortion, then image correction is achieved, but measurement errors cause projection distortion
Solution Approach 1:
The patent divides the projection surface into multiple regions and performs separate lattice point specifications for each region. This segmentation allows localized correction strategies to be applied, reducing the impact of measurement errors in any single region on the overall image correction accuracy.
Solution Approach 2:
The patent applies excessive action by performing multiple rounds of lattice point specification and correction, including both rough and fine correction stages. This ensures that even with measurement errors, the correction process iteratively improves accuracy beyond what a single specification would achieve.
2Adaptability or versatility
If a single correction method is used for all projection surfaces, then device complexity is reduced, but adaptation to different surface shapes is poor
Solution Approach 1:
The patent changes parameters by adapting correction algorithms based on the detected three-dimensional shape type of the projection surface. Different correction parameters and methods are applied depending on whether the surface is planar, curved, or irregular, enabling high adaptability without requiring completely different systems for each surface type.
Solution Approach 2:
The patent creates a universal correction system that can handle multiple surface types through a unified framework. The system automatically detects the surface shape and applies appropriate correction methods within the same device, making the projector adaptable to various projection surfaces without requiring separate correction systems.
3Manufacturing precision
If detailed lattice point specification is performed to reduce measurement errors, then correction accuracy improves, but processing time increases
Solution Approach 1:
The patent segments the correction process into distinct stages (rough correction and fine correction) with different levels of detail. This allows the system to achieve high accuracy where needed while maintaining reasonable processing times by not applying maximum detail uniformly across all areas.
Solution Approach 2:
The patent applies partial action by performing detailed lattice point specification only in regions where it is most needed, rather than uniformly across the entire projection surface. This selective approach maintains high correction accuracy while reducing overall processing time.
Data Source
AI summary
A projector projects a first image onto a projection surface to thereby display a first projected image on the projection surface, acquires first imaging data obtained by capturing the first projected image, determines, based on the first imaging data, a type of a three-dimensional shape on the projection surface, projects a second image including a plurality of points onto the projection surface to thereby display a second projected image on the projection surface, acquires second imaging data obtained by capturing the second projected image, specifies, based on the second imaging data and the type of the three-dimensional shape on the projection surface, positions of the respective plurality of points on the projection surface, generates, based on the positions of the respective plurality of points, and correction data for correcting distortion of an image projected onto the projection surface, corrects, based on the correction data, image data input to the projector.