Projector Color Wheel Synchronization for Balanced Image Capture
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Solution Overview
Problem
Projector devices using time-division color component projection systems often record images with significant color imbalance due to unsynchronized photographing timing with the color wheel rotation, leading to unbalanced color components in the projected image.
Innovation Solution
A projector device with instructing and photographing control means that synchronizes the photographing with the time-division timing for each color component and adjusts the shutter speed to match the time-division period, ensuring balanced color capture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If photographing is performed without synchronization with color wheel rotation, then the photographing process is simple and fast, but the recorded image has significant color imbalance
Solution Approach 1:
The control unit receives feedback signals from the color wheel rotation system and uses this feedback to synchronize the photographing timing. The control unit adjusts the shutter opening/closing timing based on the color wheel's rotational position to ensure balanced color capture, resolving the contradiction between simple operation and color balance accuracy.
Solution Approach 2:
The control unit performs preliminary action by pre-calculating and setting the optimal shutter timing based on the color wheel rotation speed and position. Before actual photographing, the system determines the precise moment to open and close the shutter, ensuring synchronization without requiring complex real-time adjustments during the photographing process.
2Measurement precision
If shutter speed is increased to capture balanced colors, then color balance improves, but the photographing time is extended causing potential image flicker and hand movement
Solution Approach 1:
The system uses periodic action by synchronizing the shutter timing with the periodic rotation of the color wheel. The shutter opens and closes at specific intervals that match the color wheel's rotation period, allowing brief exposure times that capture balanced colors without extending the total exposure duration, thus avoiding flicker and hand movement issues.
3Measurement precision
If photographing timing is synchronized with color wheel rotation, then color balance is maintained, but the photographing process becomes complex and requires precise timing control
Solution Approach 1:
The control unit performs self-service by automatically managing the synchronization between the color wheel rotation and shutter timing. The system self-adjusts the photographing timing based on the color wheel's rotational position without requiring manual intervention or complex user control, maintaining ease of operation while achieving color balance accuracy.
Data Source
AI summary
A protector device is provided which includes a projecting system, a photographing system, and a control section. The projecting system includes a light source lamp, a micromirror element, and a projecting lens, and each image for each of a plurality of color components is time-divided by use of a color wheel, projected, and displayed with respect to an input color image signal. The photographing system includes a photographing lens, a CCD, and a processing circuit in which the projected and displayed image is photographed in accordance with an instruction, when the photographing of the projected and displayed image is instructed. And the control section detects a rotation position of the color wheel with a marker sensor and controls the photographing system to execute the photographing in synchronization with a time division period for each color component in the projecting system.