Multi-Projector Color Matching Using Complementary Overlap Analysis
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Solution Overview
Problem
Conventional methods for color matching in multi-projector systems face challenges in accurately matching RGB colors between projectors, requiring high precision and costly measurement systems, especially when projecting large images that need to be combined.
Innovation Solution
A multi-projector system that includes projectors with light-emitting units, color adjusting units, and an analyzing apparatus to determine color components from overlapping areas of complementary color images, allowing for precise adjustment to achieve an achromatic color in overlapping regions, thereby matching colors between projectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional white image projection method is used for color matching, then white color can be matched between projectors, but RGB colors cannot be accurately matched
Solution Approach 1:
The patent uses complementary color images (red-green, blue-yellow, cyan-magenta pairs) instead of white images for color matching. By projecting these specific color combinations and analyzing their overlap regions, the system can accurately determine RGB color components and achieve precise color matching between multiple projectors, directly resolving the limitation of conventional white image methods.
2Measurement precision
If high precision measurement systems are used to measure brightness and chromaticity, then color matching accuracy is improved, but apparatus costs increase
Solution Approach 1:
The patent uses a standard colorimeter or spectrophotometer to measure the reflected light from the overlap region, and then copies/calculates the RGB color components based on these measurements. This approach allows accurate color determination without requiring expensive high-precision measurement systems for each projector, significantly reducing apparatus costs while maintaining measurement accuracy.
3Area of stationary object
If multiple projectors project simultaneously onto one screen, then large projected images can be obtained, but color differences between adjacent areas become noticeable
Solution Approach 1:
The patent divides the color matching process into specific color component measurements (R, G, B) by projecting complementary color pairs and analyzing their overlap regions. This segmented approach to color measurement and adjustment enables precise color matching across multiple projectors, ensuring color consistency in large projected images composed of multiple adjacent projector outputs.
Data Source
AI summary
Provided is a multi-projector system including: projectors; an image outputting apparatus; and an adjusting apparatus to adjust images. Each of the projectors includes: a light-emitting unit to emit the modulated light; and a color adjusting unit to adjust colors of the projected image. The image outputting apparatus includes an outputting unit to output the first adjustment image and the second adjustment image as the input images of the projectors. The adjusting apparatus includes: an imaging unit to take a projected image and to output a captured image; an analyzing unit to analyze an image of the overlapping area from the captured image so as to determine a color component; and a controller for controlling the color adjusting unit of the first projector so that the color of the overlapping area is an achromatic color in accordance with the color component determined as a result of the analysis.