LED Wall Luminance Correction Using Camera Vector Analysis
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Solution Overview
Problem
Conventional luminance correction techniques for LED walls, which consist of multiple panels, fail to control variations in brightness effectively when viewed from different directions due to the variable-angle reflecting property of LED elements, leading to inconsistent display quality.
Innovation Solution
An image processing apparatus that specifies regions on an LED wall captured by an image capturing device and calculates correction amounts for luminance values based on the direction from each pixel to the camera, accounting for individual differences in panel luminance, allowing for real-time adjustment of LED element brightness to maintain consistent display across angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single correction coefficient is defined for all LED panels, then the correction process is simple, but variations in brightness of respective panels cannot be controlled
Solution Approach 1:
The invention divides the LED wall into multiple individual LED panels and further segments each panel into multiple regions. Instead of applying a single correction coefficient to the entire LED wall, the system generates separate correction coefficients for each panel and region, enabling precise control of brightness variations across different panels while maintaining manageable complexity through automated processing.
2Reliability
If luminance correction is applied based on viewing direction, then brightness consistency from different angles is improved, but the system complexity increases due to multiple panels
Solution Approach 1:
The invention applies local quality by generating correction coefficients specific to each LED panel and region within the panel, rather than using a uniform correction approach. Each region receives customized correction based on its specific luminance characteristics and viewing angle requirements, ensuring high display consistency across the entire LED wall while managing complexity through systematic processing.
Solution Approach 2:
The system performs preliminary measurement of luminance values for each LED panel and region before generating correction coefficients. By pre-measuring and storing the actual luminance characteristics of each panel and region, the system can automatically generate appropriate correction coefficients without requiring complex real-time calculations during operation, thus improving reliability while controlling system complexity.
3Manufacturing precision
If individual panel luminance variations are corrected, then brightness uniformity across panels is improved, but measurement and correction precision requirements increase
Solution Approach 1:
The invention divides the LED wall into multiple panels and each panel into multiple regions, allowing correction to be applied progressively to each subset rather than requiring simultaneous precise measurement and correction of the entire wall. This partial action approach reduces the measurement precision burden on any single measurement point while achieving overall brightness uniformity across the complete LED wall.
Data Source
AI summary
An image processing apparatus comprises one or more processors and one or more memories containing instructions that, when executed by the one or more processors, cause the one or more processors to function as a specification unit configured to, based on a parameter of an image capturing unit, specify a region captured by the image capturing unit in a display screen in which display panels are arrayed, and a correction unit configured to, based on a direction from a pixel in the region to the image capturing unit, obtain a correction amount of a luminance value of the pixel, and based on information for correcting an individual difference regarding a luminance of a display panel, correct the correction amount.