Color Corrected Projector Images via Feedback Control
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Solution Overview
Problem
Projectors struggle to display images correctly on non-white surfaces due to lack of adjustment capabilities for varying lighting conditions and surface colors, leading to distorted images and user dissatisfaction.
Innovation Solution
A system that continuously measures image and environmental parameters using cameras and processors to generate color-corrected images, adjusting display settings to optimize image quality based on surface color, lighting, and user preferences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a projector displays images on non-white surfaces, then the projector can be used in more diverse environments, but the image quality becomes distorted due to surface color and lighting conditions
Solution Approach 1:
The system uses a camera to capture the projected image and measures its luminance and color characteristics. This feedback information is fed back to the processor, which then adjusts the display parameters (brightness, contrast, color balance) to compensate for the non-white surface and lighting conditions, thereby maintaining accurate image quality while adapting to diverse environments
Solution Approach 2:
The processor dynamically changes display parameters such as brightness, contrast, and color temperature based on measured surface characteristics and lighting conditions. By adjusting these parameters in real-time, the system maintains optimal image quality across different surface colors and environmental lighting conditions
2Manufacturing precision
If manual adjustment of display parameters is performed, then users can optimize image quality for specific conditions, but the system becomes complex and difficult to operate
Solution Approach 1:
The system automatically performs the complex tasks of measuring surface characteristics, analyzing lighting conditions, and adjusting display parameters without requiring user intervention. The camera and processor work autonomously to optimize image quality, eliminating the need for users to manually navigate complex adjustment menus while maintaining high image quality optimization
Solution Approach 2:
The patent replaces manual mechanical adjustment controls with an automated electronic measurement and processing system. Instead of users physically adjusting knobs or menus, the system uses a camera to measure conditions and a processor to automatically calculate and apply the correct display parameters, simplifying operation while maintaining precision
3Duration of action of moving object
If the projector operates in changing lighting conditions, then the projector can be used throughout the day, but the image appearance changes due to ambient light variations
Solution Approach 1:
The camera continuously monitors the projected image and ambient lighting conditions, providing feedback to the processor. This enables real-time detection of lighting changes and automatic adjustment of display parameters to maintain consistent image appearance throughout the day under varying environmental conditions
Solution Approach 2:
The system dynamically adjusts display parameters in real-time based on changing lighting conditions rather than using fixed settings. The processor continuously modifies brightness, contrast, and color temperature to adapt to ambient light variations, ensuring consistent image appearance from morning to night
Data Source
AI summary
In example implementations, an apparatus includes a camera, an image signal processor and a display processor. The camera measures metered values of an image projected onto a surface. The image signal processor is in communication with the camera to receive the metered values of the image on the surface. Display parameters are calculated by the image signal processor based on the metered values of the image on the surface that is measured. The display processor is in communication with the image signal processor and a projector. The display processor generates a color corrected image projected onto the surface by the projector. The color corrected image is generated based on the display parameters.