LED Wall Appearance Control via Camera Viewing Angle
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Solution Overview
Problem
LED walls in extended reality applications face challenges with visual artifacts due to varying brightness and color when viewed from different angles, leading to unsatisfactory seamless transitions between real and virtual content, especially when budget constraints limit the size of the LED wall and result in uneven lighting and color distortions.
Innovation Solution
A method to control the appearance of LED walls based on the camera's viewing angle by adjusting the brightness and color balance of individual LED pixels, using a computer-implemented system that determines the viewing angle and generates adjustment signals to ensure consistent appearance across different angles, thereby reducing visual artifacts and enhancing the quality of digitally augmented images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the size of the LED wall is reduced to meet budget constraints, then the cost is reduced, but the LED wall cannot fill the entire background and visual artifacts appear at the borders
Solution Approach 1:
The patent applies local quality by determining viewing angles for different regions of the LED wall and applying region-specific brightness and color adjustments. This allows each local area to be optimized for its specific viewing conditions, ensuring seamless integration with virtual content even when the LED wall is smaller and viewed from various angles.
Solution Approach 2:
The patent implements dynamics by continuously adjusting the appearance of LED wall pixels based on real-time camera viewing angle data. The control system dynamically modifies brightness and color properties of individual pixels or regions to compensate for angular viewing effects, maintaining visual consistency as the camera moves.
2Area of stationary object
If the LED wall is viewed from different angles, then the coverage area increases, but brightness and color vary causing visual artifacts
Solution Approach 1:
The patent applies parameter changes by systematically adjusting brightness and color parameters of LED wall pixels based on their viewing angles. The control system modifies these parameters in real-time to compensate for angular dependencies, ensuring that the LED wall appearance remains stable and consistent across different viewing positions.
Solution Approach 2:
The patent implements feedback by using camera tracking data to determine viewing angles and feeding this information back to the LED wall control system. This closed-loop approach allows the system to continuously adapt the LED wall appearance based on the actual camera position and orientation.
3Reliability
If chroma keying with excessive tolerance is used to ensure all background areas are selected, then no green artifacts remain, but real image content is inadvertently removed
Solution Approach 1:
The patent applies local quality by determining viewing angles for different regions of the LED wall and applying region-specific brightness and color adjustments. This allows each local area to be optimized for its specific viewing conditions, ensuring seamless integration with virtual content even when the LED wall is smaller and viewed from various angles.
Solution Approach 2:
The patent implements dynamics by continuously adjusting the appearance of LED wall pixels based on real-time camera viewing angle data. The control system dynamically modifies brightness and color properties of individual pixels or regions to compensate for angular viewing effects, maintaining visual consistency as the camera moves.
Data Source
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Figure 5a~5c
AI summary
The present invention proposes a method, preferably computer-implemented method, for controlling the appearance of a LED wall 11 dependent on a viewing angle of a camera 2 relative to the LED wall 11, the method comprising: determining a LED wall viewing angle α, αh, αv of the camera 2 relative to the LED wall 11; and adjusting the appearance of the LED wall 11 based on the determined LED wall viewing angle α, αh, αv. Furthermore, a method for creating digitally augmented camera images based on input images containing image data of a LED wall 11 captured with a camera 2 and a control system for controlling the appearance of a LED wall 11 dependent on a viewing angle of a camera 2 relative to the LED wall 11 are proposed.