Multispectral White Balance Processing for Color Accuracy
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Solution Overview
Problem
Existing image white balance processing methods rely on single-frame images with limited color information, leading to inaccuracies in color adjustment, especially in scenarios with objects in pure colors at short distances.
Innovation Solution
A white balance processing method using a multispectral color filter array sensor, which captures images in multiple color modes, performs decomposition and demosaicing processing to obtain color correction matrices, and inputs these matrices into a white balance model to calculate improved white balance parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If single-frame image with 3 channels is used for white balance processing, then the processing complexity is low, but the color accuracy is insufficient
Solution Approach 1:
The patent transitions from single-frame 3-channel image processing to multi-frame multi-color-mode image processing. By capturing images in multiple color modes (RGB, CYM, etc.) and combining information across different spectral dimensions, the system achieves higher color accuracy without proportionally increasing processing complexity, as the additional dimensional information is integrated through systematic decomposition and demosaicing operations.
Solution Approach 2:
The patent segments the white balance processing into distinct stages: decomposition processing to separate color mode components, demosaicing processing to reconstruct full-resolution images, color correction matrix calculation, and final white balance adjustment. This segmentation allows complex multi-spectral processing to be managed through modular, sequential operations, reducing overall processing complexity while maintaining high color accuracy.
2Loss of information
If multispectral color filter array sensor is used to capture images in multiple color modes, then the color information is richer, but the processing complexity increases
Solution Approach 1:
The patent performs decomposition processing and demosaicing processing as preliminary steps before white balance calculation. By pre-processing the multi-color-mode images to obtain complete color information and organized data structures, the system reduces the complexity of subsequent white balance operations. The color correction matrix is calculated based on these pre-processed images, making the final white balance adjustment more efficient.
Solution Approach 2:
The patent introduces color correction matrices as intermediary elements that bridge the gap between multi-color-mode captured images and the final white balance parameters. These matrices serve as intermediate representations that encapsulate the color transformation relationships, allowing the system to process rich color information from multiple spectral bands without directly managing the full complexity of multi-dimensional color data throughout the entire processing pipeline.
Data Source
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AI summary
A white balance processing method and an electronic device are provided, related to the field of image processing. The white balance processing method includes: displaying a first interface, where the first interface includes a first control; detecting a first operation on the first control; obtaining a first image in response to the first operation, where the first image refers to an image of a first color space captured by a multispectral color filter array sensor; performing decomposition processing and demosaicing processing on the first image to obtain a second image and a third image, where the second image is an image in a first color mode and the third image is an image in a second color mode; obtaining a color correction matrix according to the second image and the third image, where the color correction matrix is used for representing a pixel change amount of transforming the second image into the third image; inputting the color correction matrix into a white balance model to obtain a white balance parameter; and performing image processing on the first image according to the white balance parameter to obtain a fourth image. Based on the technical solutions according to this application, the color accuracy in an image can be improved.