Projector Autofocus via Camera Contrast Feedback
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Solution Overview
Problem
Existing systems struggle to automatically focus projectors on dynamically specified and potentially moving surfaces, such as walls or handheld objects, making it difficult to maintain a sharp and focused image in adaptive and automated content projection environments.
Innovation Solution
The use of a camera to capture images of projected content, analyze contrast, and adjust the projector's focal point to achieve the highest possible contrast, ensuring optimal focus quality, even on surfaces at unknown or variable distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If manual focusing is used for projectors, then focus quality can be optimized for stationary targets, but the system becomes impractical for dynamically specified and moving surfaces
Solution Approach 1:
The system captures images of the projected content with a camera, analyzes the contrast of captured pixels, and uses this feedback to automatically adjust the projector's focal point. This closed-loop feedback mechanism enables automatic focusing while maintaining sharp image quality on dynamic surfaces.
Solution Approach 2:
The patent replaces manual mechanical focusing with an automated optical-electrical system. A camera captures images, a processor analyzes contrast data, and an actuator adjusts the projector lens automatically, substituting human operation with an automated measurement and control system.
2Adaptability or versatility
If the projector is positioned for a single stationary target, then manual focusing can achieve sharp images, but the system lacks adaptability for various dynamically specified surfaces
Solution Approach 1:
The system adds a camera and automated focus adjustment mechanism to the projector, enabling it to adapt to multiple surface types and distances. This multi-functional capability allows the same system to project onto stationary walls, moving objects, and surfaces at various distances without requiring manual reconfiguration.
Solution Approach 2:
The projector system performs self-adjustment by automatically measuring the distance to the projection surface using camera-based contrast analysis and adjusting its own focal point accordingly. This self-service capability eliminates the need for manual intervention and enables automatic adaptation to different surfaces.
3Measurement precision
If the projector focal point is fixed, then the system is simpler to operate, but it cannot maintain focus on surfaces at unknown or variable distances
Solution Approach 1:
The system replaces manual distance measurement and focus adjustment with an automated optical measurement system. The camera captures images of the projected content, the processor analyzes pixel contrast to determine focus quality, and an actuator automatically adjusts the focal point, eliminating the need for manual operation while achieving precise focus.
Solution Approach 2:
The system dynamically changes the focal point parameter of the projector based on real-time analysis of image contrast. By continuously monitoring and adjusting the focal distance parameter, the system maintains optimal focus on surfaces at varying distances without requiring manual intervention.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method allows for automatic and continuous focus adjustment, ensuring sharp and clear projection of digital content onto various and potentially moving surfaces, enhancing the accessibility and usability of digital content in dynamic environments.
Implementation Method 1
content is projected onto a display surface. A camera is used to observe the projected content
Implementation Method 2
a user can manually focus the projector to produce a sharp and focused image
Data Source
AI summary
Techniques are described for projecting content onto surfaces and for focusing the content. When content is projected by a projector onto a surface, the surface is observed by a camera or other sensor, and the contrast of the projected content is evaluated. The projector then varies its focal point to improve or maximize the observed contrast of the projected content.