Multi-Projector Luminance Adjustment via Captured Reflection Data
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Solution Overview
Problem
Existing image projection systems struggle to achieve optimal luminance across a projection surface due to varying reflection characteristics, leading to inconsistencies in image brightness when viewed from different positions, especially when multiple projectors overlap their images.
Innovation Solution
Incorporating imaging sections within projectors to capture and analyze the luminance distribution of projected images, allowing for precise adjustment of image brightness across the projection surface, including overlapping areas, using computation sections to determine and apply luminance adjustment information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an external image capturing section is used to capture test images for luminance correction, then luminance adjustment can be performed across the projection area, but the captured luminance distribution does not accurately represent the actual viewing luminance due to reflection characteristics of the projection surface
Solution Approach 1:
The patent introduces a position information capturing mechanism as an intermediary to bridge the gap between the captured image luminance and the actual viewing luminance. By capturing position information (coordinates) of the projected image and using this to map and correct luminance values, the system accounts for reflection characteristics and viewing angle effects, thereby improving the reliability of luminance adjustment while maintaining measurement precision.
2Area of stationary object
If multiple projectors project overlapping images on a projection surface, then a large-screen image can be formed, but luminance inconsistencies appear in overlapping areas due to varying reflection characteristics at different observation positions
Solution Approach 1:
The patent applies local quality by performing luminance correction on a pixel-by-pixel or region-by-region basis across the projection area. Instead of uniform adjustment, the system calculates specific luminance correction values for different positions (especially in overlapping areas) based on captured position information and reflection characteristics, then applies targeted corrections to achieve uniform luminance across the entire large-screen projection area.
Solution Approach 2:
The system implements feedback by capturing position information and luminance data from the projected images, calculating correction values based on this feedback, and then applying the corrections to subsequent projections. This closed-loop approach allows the system to continuously optimize luminance uniformity in overlapping areas, ensuring consistent brightness across the entire projection surface.
3Ease of operation
If the image capturing section is positioned at a different location than the viewer, then the captured luminance distribution differs from the actual viewing luminance due to the reflection characteristics of the projection surface
Solution Approach 1:
The patent uses position information (coordinates) as an intermediary to decouple the capturing section position from the viewer position. By capturing and storing position information along with luminance data, the system can map the captured luminance distribution to the actual viewing geometry, accounting for reflection characteristics. This allows the capturing section to be positioned flexibly while still achieving accurate luminance measurement from the viewer's perspective.
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 approach ensures accurate and consistent luminance adjustment, minimizing errors caused by reflection characteristics, resulting in improved image quality and uniform brightness across the projection surface.
Implementation Method 1
A projection surface on which a projector projects an image has reflection characteristics, and the intensity of light reflected off the projection surface varies depending on the observation position where a viewer views the projection surface.
Data Source
AI summary
An image projection system includes a first projector and a second projector. The first projector includes a first projection section that projects a first image and a first imaging section that captures an image of an area including the first image. The second projector includes a second projection section that projects a second image and a second imaging section that captures an image of an area including the second image. The image projection system further includes a computation section that determines first luminance adjustment information used to adjust the luminance of the first image and second luminance adjustment information used to adjust the luminance of the second image based on the luminance distribution of the first image determined from the image captured by the first imaging section and the luminance distribution of the second image determined from the image captured by the second imaging section.