Multi-Projector Color Calibration via Dynamic Feedback
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Solution Overview
Problem
Conventional multi-projector calibration methods are costly and cannot perform dynamic adjustments to maintain color consistency during online operation, as they rely on illuminance meters and are limited to offline calibration.
Innovation Solution
A multi-projector system with an image capturing device and projectors that communicate to dynamically adjust electrical parameters of light source modules, such as PWM signals, to ensure color consistency by calculating and updating absolute differences in color values between projected images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an illuminance meter is used to measure color temperature and manually adjust projector parameters, then color consistency between projectors can be improved, but the cost of the calibration method increases
Solution Approach 1:
The patent uses a camera to capture images of the projected content and extract color information, replacing the expensive illuminance meter. The camera captures the actual projected image and the system analyzes the color values from the captured images to determine color temperature and perform calibration, creating a cost-effective copy of the measurement function.
Solution Approach 2:
The patent replaces the manual mechanical adjustment process with an automated digital system. The system automatically captures images, calculates color values, determines color temperature, and adjusts projector parameters through digital communication, eliminating the need for manual intervention and reducing operational complexity.
2Manufacturing precision
If conventional calibration method is used, then color consistency can be adjusted, but the calibration can only be performed during offline phase and cannot perform dynamic adjustments during online operation
Solution Approach 1:
The patent implements a dynamic calibration system that can operate during both offline and online phases. During online operation, the system continuously captures images of the projected content, calculates color values in real-time, and dynamically adjusts projector parameters to maintain color consistency, enabling the system to adapt to changing conditions during operation.
Solution Approach 2:
The patent establishes a feedback loop where the camera continuously monitors the projected image color values, compares them against target values, and sends adjustment commands back to the projectors. This closed-loop feedback mechanism enables real-time color consistency maintenance during online operation, allowing the system to self-correct and adapt dynamically.
3Manufacturing precision
If manual adjustment of projector parameters is performed, then color temperature can be calibrated, but the process requires human intervention and cannot maintain color consistency dynamically
Solution Approach 1:
The patent implements a self-service calibration system where the projectors automatically perform color temperature calibration without human intervention. The system autonomously captures images, calculates color values, determines temperature deviations, and adjusts its own parameters through automated communication protocols, enabling the projectors to self-calibrate and maintain color consistency independently.
Data Source
AI summary
A multi-projector system and a method of calibrating the multi-projector system are provided. The method includes: controlling a first projector to project a first image, and capturing and generating a first captured image including the first image to obtain a first color value from the first captured image through an image capturing device; projecting a second image according to a first projection parameter, and capturing and generating a second captured image including the second image to obtain a second color value from the second captured image through the image capturing device, wherein the first projection parameter includes an electrical parameter of a light source module of the second projector; calculating an absolute difference between the first color value and the second color value; and adjusting the first projection parameter to update the absolute difference in response to the absolute difference being greater than a first threshold.