Off-Axis Color Correction for Dynamic Video Wall Capture
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Solution Overview
Problem
Video cameras capturing images from LED video walls experience color distortions and variations due to differing color performance at varying viewing angles, particularly in three-dimensional configurations, leading to non-uniformity and artifacts that degrade image quality.
Innovation Solution
A system comprising a database of off-axis color uniformity characteristics and a correction engine that applies a color uniformity correction layer to the video stream based on the camera's viewing angle and field of view, using metadata from a camera tracking system to adjust pixel-by-pixel color corrections in real-time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LED video walls are used with three-dimensional configurations and varying viewing angles, then display versatility and adaptability are improved, but color uniformity and image quality deteriorate due to off-axis color variations
Solution Approach 1:
The patent applies local quality by implementing pixel-level color corrections tailored to specific viewing angles and positions. Each pixel receives customized correction values based on its location in the display array and the camera's current viewing angle, ensuring that color uniformity is maintained locally across different regions of the display while accommodating three-dimensional configurations.
Solution Approach 2:
The system dynamically adjusts color corrections in real-time based on the camera's viewing angle and position. By continuously updating correction values according to the current capture geometry, the system maintains color uniformity across varying viewing angles without requiring fixed display configurations, thus enabling adaptability while preserving precision.
2Manufacturing precision
If real-time color corrections are applied at pixel-level for multiple viewing angles, then color uniformity is improved, but computational complexity and processing requirements increase
Solution Approach 1:
The patent implements preliminary action by pre-calculating and storing correction values in lookup tables for various viewing angles and pixel positions. During real-time operation, the system simply retrieves pre-computed correction values based on the current camera angle, avoiding the need for complex real-time calculations while maintaining pixel-level color uniformity.
Solution Approach 2:
The system uses lookup tables that store pre-computed correction data, effectively creating a copy of correction values that can be quickly referenced and applied. This approach replaces complex real-time computational processes with simple data retrieval operations, significantly reducing processing complexity while maintaining color correction precision.
3Manufacturing precision
If off-axis color variations are corrected for multiple camera angles, then image quality is improved, but the time required for color correction calculations increases
Solution Approach 1:
By pre-computing correction values for multiple viewing angles and storing them in lookup tables, the system eliminates the need for time-consuming real-time calculations. During operation, the system simply retrieves the appropriate correction values based on the current camera angle, achieving both high image quality and real-time performance.
Solution Approach 2:
The patent replaces complex real-time computational mechanics with a data retrieval mechanism. Instead of performing iterative color correction calculations during video capture, the system substitutes this with direct lookup and application of pre-stored correction values, dramatically reducing correction time while maintaining image quality.
Data Source
AI summary
Disclosed systems and methods for off-axis color correction in dynamic image capture of video wall displays involve measuring color performance of specific LED tiles or video walls and providing a database to store the characteristics of these off-axis measurements for use in color correction. The database is accessible by a color correction engine associated directly or indirectly with the video rendering engine so that when combined with real-time information on camera view angle and field of view relative to the display, a color correction function can be incorporated into the rendering of the display portion within the field of view of the camera so as to reduce or eliminate off-axis color variations/distortions in the captured image.