Pixel Array CFA Block Sub-Block Arrangement Reducing Interpolation Distance
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Solution Overview
Problem
High-resolution image sensors experience increased loss of image information during signal processing due to the growing distance between adjacent color pixels in the pixel array, particularly during interpolation and extrapolation processes.
Innovation Solution
The implementation of a pixel array with a color filter array (CFA) cells, each comprising CFA blocks arranged in a 2-by-2 configuration, where each CFA block includes color pixels sensing multiple colors, reducing the interpolation distance and minimizing image loss by ensuring neighbor color pixels are in close proximity to the target pixel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pixel array is implemented with high resolution by increasing the number of color pixels, then the image quality is improved, but the distance between adjacent color pixels increases causing loss of image information during interpolation and extrapolation
Solution Approach 1:
The pixel array is segmented into multiple CFA cells, each CFA cell is divided into multiple CFA blocks, and each CFA block is further divided into sub-blocks. This hierarchical segmentation allows for a more distributed arrangement of color pixels, reducing the distance between adjacent color pixels of different colors while maintaining high resolution.
Solution Approach 2:
Different regions of the pixel array have different color pixel arrangements. Specifically, each CFA block contains color pixels of different colors (first color, second color, third color) in specific patterns, creating local variations in color pixel distribution that reduce interpolation distances compared to uniform arrangements.
2Productivity
If mosaic processing is performed for converting raw image into RGB image pattern, then the image processing is completed, but the loss of image information increases when distance to adjacent color pixel increases
Solution Approach 1:
The pixel array is pre-configured with multiple color pixels (first color, second color, third color) within each CFA block in a specific arrangement before the image capture. This preliminary arrangement ensures that adjacent color pixels are always available in close proximity, reducing the need for long-distance interpolation during the mosaic processing conversion from raw image to RGB image pattern.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively decreases the image loss rate during processing by ensuring that neighbor color pixels are selected in close proximity, thereby reducing interpolation distances and maintaining image quality.
Implementation Method 1
color pixels include a sub-block, wherein the sub-block includes at least one first color pixel sensing a first color, at least one second color pixel sensing a second color different from the first color, and at least one third color pixel sensing a third color different from the first color and the second color
Data Source
AI summary
A pixel array including; color filter array (CFA) cells, each respectively including CFA blocks, each CFA block including color pixels, and the color pixels include a sub-block. The sub-block includes at least one first color pixel sensing a first color, at least one second color pixel sensing a second color different from the first color, and at least one third color pixel sensing a third color different from the first color and the second color.