Projector Correction Frame Brightness Control
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Solution Overview
Problem
Current projector systems using cameras for image correction face limitations in adjusting shutter speed due to environmental constraints, leading to potential overexposure and poor image quality, which can result in unrecognizable test patterns and termination of correction processes.
Innovation Solution
A projector system comprising a projection device, a capturing device, and a controller that adjusts the brightness of the correction frame based on the capture area's brightness, using RGB values and shutter speed to form an adjusted correction frame, thereby avoiding overexposure and improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If shutter speed is increased to avoid overexposure, then image brightness is controlled, but correction quality deteriorates due to color breaking when not synchronized with color wheel speed
Solution Approach 1:
The patent changes the control parameter from shutter speed to correction frame brightness. Instead of adjusting shutter speed to control exposure, the system directly adjusts the brightness of the correction frame projected by the projector. This allows independent control of exposure without being constrained by shutter speed synchronization requirements with the color wheel, thereby maintaining correction quality while controlling image brightness.
2Measurement precision
If minimum aperture and ISO are adopted to improve capturing quality, then noise is reduced, but brightness control capability is limited
Solution Approach 1:
The patent introduces the correction frame brightness as an intermediary element between the capturing device and the exposure control. By adjusting the brightness of the correction frame itself rather than the capturing parameters, the system enables brightness control while maintaining optimal capturing settings (minimum aperture and ISO) for high image quality and low noise.
3Illumination intensity
If shutter speed is adjusted to control brightness, then overexposure is avoided, but correction process may terminate due to unrecognizable test patterns
Solution Approach 1:
The patent inverts the traditional approach by not adjusting capturing parameters to control brightness, but rather adjusting the brightness of the correction frame itself. This ensures that the test pattern features remain recognizable and the correction process can continue, while still achieving proper exposure control through brightness adjustment of the correction frame rather than through shutter speed limitations.
Data Source
AI summary
A projector includes a projection device, a capturing device, and a controller. The projection device is configured to project an image beam to form a correction frame. The capturing device is configured to capture a correction frame to generate a captured image frame. The controller is electrically connected to the projection device and the capturing device. The controller receives the captured image frame and adjusts the brightness of the correction frame according to the brightness in the capture area of the captured image frame, and records RGB values of the adjusted correction frame and the capturing parameter of the capturing device after adjusted. An adjustment method for the correction frame of the projector is also provided.