Multi-Camera Color Matching Using Viewing Angle Correction
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Solution Overview
Problem
Existing image correction technologies fail to accurately account for uneven color and brightness when images are taken with multiple cameras due to differences in viewing angles and camera characteristics, particularly when capturing an LED display wall at various angles.
Innovation Solution
An image correction apparatus and system that calculates and applies viewing angle correction values to adjust for positional differences between cameras, followed by color and brightness corrections to ensure accurate color matching across multiple images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If color matching is performed using conventional techniques without considering viewing angle characteristics, then the color matching process is simple, but the accuracy of color matching between multiple cameras is low due to uneven color and brightness when LED displays are viewed at angles
Solution Approach 1:
The patent applies preliminary action by calculating and storing viewing angle correction values in advance for different positions relative to the display screen. These correction values are pre-computed based on the display's viewing angle characteristics and stored for later use during color matching, eliminating the need for complex real-time calculations while improving accuracy
Solution Approach 2:
The patent segments the color matching process into distinct stages: first applying viewing angle correction using pre-calculated values, then performing color balance adjustment. This segmentation allows each correction aspect to be handled independently, managing complexity while achieving high accuracy
2Area of stationary object
If cameras are positioned at different angles to capture the LED display wall, then comprehensive coverage of the display is achieved, but uneven color and brightness occur due to viewing angle characteristics
Solution Approach 1:
The patent applies local quality by calculating specific viewing angle correction values for different positional regions relative to the display screen. Each camera position receives customized correction values tailored to its specific viewing angle, ensuring uniform color and brightness across all captured areas despite different camera angles
Solution Approach 2:
The patent changes parameters by introducing viewing angle correction values that adjust the color and brightness parameters of captured images based on their viewing angle. This parameter adjustment compensates for the color shifts and brightness variations that occur when cameras are positioned at different angles to achieve comprehensive display coverage
Data Source
AI summary
An image correction apparatus which improves the accuracy of color matching between image pickup apparatuses. The image correction apparatus performs color matching between the image pickup apparatuses using picked-up images generated by displaying a display image on a display screen and causing the plurality of image pickup apparatuses to shoot the display image. In the image correction apparatus, viewing angle correction values for use in correcting viewing angle characteristics resulting from positions of the plurality of image pickup apparatuses with respect to the display screen to a predetermined viewing angle characteristics are stored in memory, corrected images are generated by subjecting the display image in the picked-up images to correction using the viewing angle correction values, and color correction values for use in color matching between the plurality of corrected images are calculated.