Demosaic Processing for Multispectral False Color Suppression
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Solution Overview
Problem
The increase in the number of colors in a color filter for imaging elements leads to a decrease in the number of pixels per color, resulting in aliasing and the generation of false colors during demosaic processing, which affects the quality of multispectral and RGB images.
Innovation Solution
An image processing apparatus and method that applies demosaic processing to generate multispectral images with a reduced number of colors, combining demosaic processing with linear matrix processing and utilizing edge information to suppress false color generation while improving color reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of colors in a color filter is increased to acquire a mosaic image with more colors, then the color information obtained from the imaging element is improved, but the number of pixels per color decreases, resulting in aliasing and false color generation during demosaic processing
Solution Approach 1:
The patent changes the parameter of the number of colors in the mosaic image from the conventional three colors (RGB) to five or more colors. This parameter change enables acquisition of richer color information while the demosaic processing is specifically designed to handle the increased number of colors, converting the mosaic image with five or more colors into a natural color image without causing aliasing or false color generation.
Solution Approach 2:
The patent applies demosaic processing that selectively handles color information by prioritizing certain color components over others. The processing uses luminance information and selectively interpolates chrominance information, applying partial action to specific color channels to avoid aliasing while still utilizing the benefits of having five or more color filters.
2Measurement precision
If demosaic processing is applied to a mosaic image with many colors to generate a multispectral image, then color reproduction capability is improved, but aliasing occurs leading to false color generation
Solution Approach 1:
The patent introduces luminance information as an intermediary element in the demosaic processing. The luminance signal serves as a mediator that guides the interpolation of chrominance information. By using luminance as an intermediary, the processing can accurately reproduce colors without directly relying on interpolation of all color channels, thereby preventing aliasing and false color generation while maintaining high color reproduction accuracy.
Solution Approach 2:
The patent replaces the conventional approach of directly interpolating all color channels with a method that substitutes mechanical interpolation with a more sophisticated processing approach. Instead of uniformly interpolating all color components, the system uses luminance-guided selective chrominance interpolation, substituting the simple mechanical demosaic process with a more intelligent processing method that prevents false color generation.
Data Source
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AI summary
Provided are an image processing apparatus, an image processing method, and an imaging apparatus. An image processing apparatus includes a demosaic processing unit configured to apply demosaic processing to a mosaic image having a first number of colors to generate a multispectral image having a second number of colors equal to or more than three but less than the first number of colors.