Projection Image Processing for Overlapping Region Brightness
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Solution Overview
Problem
In projection systems where multiple images overlap, the gradation of the composite projection image is often deviated due to varying brightness levels, leading to a deterioration in image quality, as existing technologies do not account for the overlapping regions when displaying images on a large screen.
Innovation Solution
An image processing device and method that defines overlapping and non-overlapping regions for each projected image, adjusts brightness levels specifically for these regions, and generates data to ensure uniform gradation by using a brightness acquisition unit to measure and adjust the brightness of overlapping areas, thereby aligning the gradation of the projection image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple division images are projected to display on a large screen, then the display area is increased, but the gradation of the composite projection image deteriorates due to brightness deviation in overlapping regions
Solution Approach 1:
The patent applies local quality by differentiating processing between overlapping and non-overlapping regions. Specifically, the image processing device performs gamma correction and brightness adjustment only on the overlapping portions of the composite image, while leaving non-overlapping regions unchanged. This localized processing approach resolves the gradation deviation problem in overlapping areas without affecting the overall image quality or requiring reprocessing of the entire image, thereby maintaining high precision in the overlapping regions while preserving the large display area benefit.
2Object-generated harmful factors
If a specific image with low brightness is displayed in the overlapping region, then the overlap is less noticeable, but the projected image still has slight brightness due to light source transmission, causing gradation deviation
Solution Approach 1:
The patent applies preliminary anti-action by performing gamma correction and brightness adjustment on the overlapping regions before the final composite image is displayed. The image processing device预先 (in advance) processes the overlapping portions to compensate for the inherent brightness from light source transmission, thereby preventing gradation deviation before it occurs. This proactive approach ensures that even when low-brightness images are displayed, the overlapping regions maintain correct gradation without requiring post-processing or causing visible artifacts.
3Illumination intensity
If the light source transmission amount is controlled to adjust gradation, then the overall brightness is regulated, but minute light still incidents on the projection surface causing the specific image to have slight brightness
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the gamma correction parameter and brightness offset specifically for the overlapping regions of the composite image. The image processing device calculates appropriate gamma values and brightness compensation amounts based on the light source transmission characteristics, then applies these parameter adjustments only to the overlapping portions. This selective parameter modification allows the system to maintain correct gradation in overlapping areas while preserving the overall brightness control function, effectively resolving the contradiction between regulating overall brightness and preventing minute light interference.
Data Source
AI summary
An image processing device for a projection system includes an image generation unit and a brightness acquisition unit, and the image generation unit generates data for projecting the specific image, as a first portion in the first data for display, which corresponds to the first superimposed region, generates a second portion in the first data for display, which corresponds to the first non-superimposed region based on first input image data in the data of the projection target image, which corresponds to the first non-superimposed region, and the second brightness, and generates a third portion in the second data for display, which corresponds to the second superimposed region based on second input image data in the data of the projection target image, which corresponds to the second superimposed region, and the first brightness.