Auto White Balance Illuminant Detection Dominant Chroma
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Solution Overview
Problem
Existing auto-white controlling technologies fail to maintain consistent color reproduction when an object with dominant chroma is present in an image, even under the same illuminant.
Innovation Solution
An auto-white controlling method and apparatus that detects a first illuminant using feature points from images with dominant chroma, calculates the mean chroma difference within a threshold, and maps it to an illuminant locus to provide a second illuminant for consistent color reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If related art auto-white controlling technology is used to compensate for color tone distortion, then color tone can be corrected under normal conditions, but color reproduction becomes inconsistent when an object having dominant chroma exists in an image
Solution Approach 1:
The patent extracts and removes the dominant chroma object from the image data before illuminant detection. By identifying pixels with dominant chroma values and excluding them from the calculation, the system prevents these objects from skewing the illuminant detection, thereby maintaining consistent color reproduction across different scenes.
Solution Approach 2:
The patent segments the image data into different regions based on chroma characteristics. It divides pixels into those with dominant chroma (to be excluded) and those without (to be used for illuminant detection). This segmentation allows the system to selectively process different portions of the image data according to their suitability for illuminant estimation.
2Reliability
If conventional illuminant detection is applied, then processing is simple and fast, but color reproduction performance deteriorates in the presence of dominant chroma objects
Solution Approach 1:
The system performs self-correction by automatically identifying and compensating for the presence of dominant chroma objects. The algorithm autonomously detects which pixels have dominant chroma values and excludes them from illuminant detection without requiring manual intervention or complex external processing, maintaining efficiency while improving reliability.
Solution Approach 2:
The patent performs preliminary filtering of image data before illuminant detection by pre-identifying and marking pixels with dominant chroma values. This preliminary action prepares the data in advance, allowing the main illuminant detection algorithm to proceed efficiently with already-preprocessed data that has had problematic pixels excluded.
Data Source
AI summary
An auto white controlling method and apparatus are provided. The method includes providing a plurality of feature points having color features of an image if the image includes an object having dominant chroma; detecting a first illuminant according to the feature points; calculating a mean chroma of data showing a chroma difference within a threshold value with a chroma of the first illuminant among data constituting the image; and providing a second illuminant by mapping the mean chroma to an illuminant locus. The apparatus includes a feature-analyzing module that provides a plurality of feature points having color features of an image; and an illuminant-detecting module that detects a first illuminant by using the feature points, calculates a mean chroma of data showing the color difference within a threshold value with the chroma of the first illuminant, and provides a second illuminant by mapping the mean chroma to an illuminant locus.