Image Processing Apparatus White Balance Adjustment Using Stored Achromatic Region Coordinates
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Solution Overview
Problem
Conventional image processing methods fail to accurately adjust white balance in low-illuminance environments or under specific light sources, leading to incorrect recognition of chromatic regions as achromatic, which results in incorrect color reproduction of captured images.
Innovation Solution
An image processing apparatus that uses previously detected achromatic region information to adjust white balance by storing and referencing coordinate position information, even when an achromatic region cannot be detected, and applies weighting to regions to account for changes in the angle of view or moving subjects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an achromatic region is extracted based on color saturation from a captured image, then white balance adjustment can be performed, but in low-illuminance environments or under specific light sources, chromatic regions may be falsely recognized as achromatic regions, leading to incorrect color reproduction
Solution Approach 1:
The system performs preliminary action by detecting and storing achromatic region coordinate position information from previously captured images under normal lighting conditions. When the current image lacks detectable achromatic regions (in low-illuminance or specific light source conditions), the stored coordinate information from previous measurements is retrieved and used for white balance adjustment, preventing incorrect color reproduction.
2Stability of the object's composition
If white balance adjustment is performed using stored gain values from previously captured images, then color consistency can be maintained across different lighting conditions, but the system cannot adapt to changes in angle of view or moving subjects
Solution Approach 1:
The system implements feedback by continuously monitoring the current captured image for achromatic regions and comparing them with stored coordinate position information. When changes in angle of view or moving subjects are detected (indicated by absence of expected achromatic regions or presence of new regions), the system updates the stored coordinate information accordingly. This feedback mechanism ensures both color consistency through use of reliable data and adaptability through continuous updating.
Data Source
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AI summary
An image processing apparatus determines an achromatic region position based on an achromatic region detected in first image data obtained by image capturing, and calculates a color correction parameter used for performing color correction processing on second image data obtained by image capturing performed later than that of the first image data, wherein the color correction parameter is calculated based on color information about a position in the second image data corresponding to the determined achromatic region position.