Gamma Curve Correction for Projector Image Quality
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Solution Overview
Problem
High-end projectors face challenges in maintaining ideal gamma curves across different modes, leading to suboptimal projection image quality and difficulties in edge blending for seamless image splicing, as existing technologies fail to adjust gamma specifications effectively.
Innovation Solution
A projection system and method that project a test image to obtain a first gamma curve, compare it with a preset curve, and correct deviations to generate a second gamma curve, ensuring ideal output performance based on the use situation, thereby achieving consistent image representation and edge fusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the projector uses a fixed gamma curve for different modes, then the device complexity is reduced, but the projection image quality deteriorates due to gamma curve deviations in different modes
Solution Approach 1:
The patent applies dynamics by making the gamma curve adjustable rather than fixed. The system dynamically selects and applies different gamma curves based on the operating mode (video, presentation, DICOM, 3D) to ensure optimal image quality for each mode while maintaining manageable device complexity through automated mode-based selection
Solution Approach 2:
The patent changes the gamma curve parameter according to different operating modes. By storing multiple preset gamma curves and selecting the appropriate one based on the current mode, the system achieves mode-specific optimization without requiring complex real-time adjustments, thus balancing image quality with device complexity
2Device complexity
If the projector does not provide ideal gamma curve correction, then the device complexity is reduced, but the edge fusion capability deteriorates due to display differences in overlapping parts
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing correction values for different gray levels before actual projection. The system creates a lookup table of correction data in advance, which is then applied during projection to ensure consistent gamma curves across multiple projectors for seamless edge fusion
Solution Approach 2:
The patent uses feedback by measuring the actual gamma curve of the projected image and comparing it with the target gamma curve. Based on this comparison, the system automatically adjusts the gamma correction parameters to minimize deviations, ensuring reliable edge fusion capability
3Manufacturing precision
If the projector measures and corrects gamma curve deviations, then the projection image quality is improved, but the loss of time increases due to additional measurement and correction operations
Solution Approach 1:
The patent applies preliminary action by performing gamma curve measurements and corrections during the initial setup or calibration phase. Once the correction values are determined and stored in lookup tables, no additional real-time measurement or correction is needed during normal operation, thus improving image quality without significant time loss during actual projection
Solution Approach 2:
The patent applies self-service by implementing automated gamma curve measurement and correction functions within the projector itself. The system automatically performs measurements, calculates corrections, and applies them without requiring external equipment or manual intervention, thereby improving image quality while minimizing time loss
Data Source
AI summary
The disclosure provides a projection system and a gamma curve correction method. The projection system includes a projection target and a projection device. A test image is projected on the projection target. The projection device obtains a first gamma curve of the test image by receiving the test image projected on the projection target or sensing a light beam of the projected test image, and judges whether multiple difference values between the first gamma curve and a preset gamma curve is larger than a preset value. The first gamma curve is corrected to generate a second gamma curve when at least one of the difference values is larger than the preset value. The projection system and the gamma curve correction method of the disclosure provides an ideal gamma curve according to the output performance of the use situation.