Projector Image Correction on Non-Planar Surfaces
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Solution Overview
Problem
Existing projector technologies face difficulties in accurately aligning marks on a non-planar projection surface, leading to distortion and making it challenging to specify corresponding marks in the projected image.
Innovation Solution
A control method for projectors that projects a line segment and mark images onto a surface, captures imaging data, generates relation data associating marks, and uses this data to create correction data for correcting image distortion, ensuring accurate alignment and projection of corrected images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If marks are projected onto a non-planar projection surface, then image coverage is improved, but mark alignment precision deteriorates
Solution Approach 1:
The patent segments the projection correction process into multiple stages: first projecting a reference image with marks to capture imaging data, then using that data to generate correction data, and finally applying the correction to the actual image. This segmentation allows the system to handle non-planar surfaces by processing correction information in discrete steps, thereby maintaining mark alignment precision while achieving broad projection surface coverage.
Solution Approach 2:
The patent employs preliminary action by first projecting a reference image containing marks onto the projection surface before projecting the actual image. The imaging data captured from this reference projection is used to generate correction data in advance. This preliminary correction data generation enables the system to compensate for non-planar surface effects before the actual image projection, thus maintaining precision despite surface irregularities.
2Adaptability or versatility
If image projection is performed on non-planar surfaces, then adaptability is improved, but distortion correction accuracy deteriorates
Solution Approach 1:
The patent implements feedback by capturing imaging data from the projected reference image on the non-planar surface and using this data to generate correction information. The correction data is then applied to improve the accuracy of subsequent image projections. This feedback loop enables the system to adapt to various non-planar surfaces while maintaining distortion correction accuracy through iterative refinement based on actual projection conditions.
Solution Approach 2:
The patent utilizes parameter changes by adjusting projection parameters based on the captured imaging data. The system modifies correction parameters dynamically according to the specific non-planar surface characteristics detected in the imaging data. This allows the system to maintain high distortion correction accuracy across different projection surfaces by adapting correction parameters to match actual surface conditions.
3Manufacturing precision
If multiple marks are projected for alignment, then alignment accuracy is improved, but system complexity increases
Solution Approach 1:
The patent merges the reference image projection and actual image projection into a unified correction workflow. By combining the mark alignment process with the image projection process through a shared correction data generation mechanism, the system achieves high mark alignment accuracy without proportionally increasing system complexity. The correction data serves both alignment verification and image correction purposes simultaneously.
Solution Approach 2:
The patent introduces correction data as an intermediary element that mediates between the projected marks and the final image alignment. This intermediary correction information simplifies the overall system by providing a standardized method to translate mark position data into actionable correction parameters, thereby reducing the complexity of directly managing multiple mark alignment operations while maintaining high alignment accuracy.
Data Source
AI summary
A first image including a first line segment is projected onto a projection surface to acquire first imaging data of a first projected image. A second image including a first mark and a second mark overlapping the first line segment is projected onto the projection surface to acquire second imaging data of a second projected image. Based on a positional relation between a third mark and a fourth mark located on a second line segment corresponding to the first line segment and a positional relation between the first mark and the second mark located on the first line segment, relation data that associates the first mark and the third mark and associates the second mark and the fourth mark is generated. Correction data is generated based on the relation data. Image data is corrected based on the correction data. A corrected image is projected onto the projection surface.