Multi-Projector Color Correction via External Imaging
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Solution Overview
Problem
Existing image projection systems face challenges in accurately correcting color shifts among multiple projectors due to individual differences in projector sensitivity and positioning, leading to incomplete capture of the projection surface and errors in imaging values.
Innovation Solution
An image projection system comprising a first and second projector, where the first projector captures part of its own image and the second projector's image, calculates correction data to set a target color, and transmits this data to the second projector to ensure accurate color correction across both projectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If imaging apparatuses are mounted on each projector to capture projection surfaces, then color shift correction can be performed, but the imaging apparatus cannot capture the entire projection surface due to insufficient distance
Solution Approach 1:
The patent introduces a separate imaging apparatus positioned independently from the projectors to serve as an intermediary for capturing the projection surface. This external imaging apparatus acts as a mediator that can capture the entire projection surface without being constrained by the projector positions, thereby resolving the contradiction between achieving accurate color shift correction and capturing the complete projection area.
Solution Approach 2:
The system separates the projection function and the imaging/capture function into independent components. The projectors remain in their optimal positions for image projection while a separate imaging apparatus is positioned to capture the entire projection surface. This segmentation allows each component to perform its function optimally without compromising the other.
2Measurement precision
If multiple imaging apparatuses mounted on projectors are used for color shift correction, then correction can be performed, but errors occur due to individual sensitivity differences of the imaging apparatuses
Solution Approach 1:
The patent merges the imaging function into a single centralized apparatus rather than having multiple distributed imaging apparatuses on each projector. This unified imaging apparatus captures images of the projection surface without being subject to individual sensitivity variations, thereby improving the reliability and consistency of the correction results while maintaining measurement precision.
3Manufacturing precision
If projectors are positioned to achieve desired image projection, then projection quality is improved, but sufficient distance cannot be secured between imaging apparatus and projection surface for complete capture
Solution Approach 1:
The patent changes the spatial arrangement by positioning the imaging apparatus in a different dimensional configuration relative to the projectors and projection surface. Instead of mounting imaging apparatuses on the projectors themselves (constrained by projector positioning), the imaging apparatus is positioned independently in space to capture the projection surface from an optimal distance, thereby resolving the conflict between projection quality and capture completeness.
Data Source
AI summary
A target color is set on the basis of a first captured image obtained by capturing, with an imaging section, at least a part of a first image projected by a projection optical system of a projector. First correction data for correcting a color of a projected image of another projector to the target color is calculated on the basis of a second captured image obtained by capturing, with the imaging section, at least a part of a second image projected by the projection optical system of the other projector.