Chroma Suppression for LED Billboard Color Accuracy
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Solution Overview
Problem
Image capture devices struggle to maintain accurate color representation of LED billboards in images due to auto white balance adjustments being influenced by ambient light, resulting in unnatural hues.
Innovation Solution
An image capture apparatus and chroma suppression program that identify the color temperature of light sources, adjust white balance, and specifically suppress chroma errors in image data from LED billboards by converting inaccurate colors back to their original state through a chroma suppression process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If auto white balance adjustment is performed on ambient light, then the white balance of the image is improved, but the color of LED billboard images becomes unnatural
Solution Approach 1:
The image processing is segmented into different regions: ambient light regions and LED billboard regions. The white balance adjustment is applied selectively based on region identification, allowing different processing strategies for different parts of the image to resolve the contradiction between overall white balance and local color accuracy
Solution Approach 2:
Different quality requirements are applied to different regions: global white balance adjustment for the overall image and local chroma suppression specifically for LED billboard regions. This local quality approach allows the LED billboard color to be preserved while maintaining acceptable white balance in other areas
2Manufacturing precision
If chroma suppression is applied to LED billboard image data, then the color accuracy of LED billboard is improved, but the processing complexity increases
Solution Approach 1:
The system performs preliminary identification of LED billboard regions and detection of flickering patterns before applying chroma suppression. This preliminary action allows the complex chroma suppression to be applied only where needed, reducing overall processing complexity while maintaining color accuracy
Solution Approach 2:
The patent uses a predetermined color temperature (6504K) as a reference copy for LED billboard color correction. Instead of complex real-time analysis, the system copies this standard illuminant characteristics to correct LED billboard colors, simplifying the processing while achieving good results
Data Source
AI summary
An image capture apparatus includes: an acquisition unit configured to acquire image data of a subject; an identification unit configured to identify a color temperature of light from the subject on the basis of the image data acquired by the acquisition unit; an adjustment unit configured to adjust a white balance of the image data on the basis of the color temperature identified by the identification unit; and a suppression unit configured to suppress a chroma of the image data applied adjustment by the adjustment unit, if image data of a specific light-emitting body is included in the image data, on the basis of color information of the specific light-emitting body applied adjustment by the adjustment unit, by eliminating color of the specific light-emitting body applied adjustment by the adjustment unit.