Color Imaging Element with Segmented Filter Array for Aliasing Suppression
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Solution Overview
Problem
Conventional color imaging elements, such as those with Bayer arrays, face challenges in reproducing high-frequency images due to aliasing and color moire issues, and existing solutions either complicate de-mosaic processing or degrade high-frequency reproducibility.
Innovation Solution
A single plate color imaging element with a specific array pattern of color filters, where a first filter with higher transmittance is placed in peripheral positions and a second filter with lower transmittance is placed in other positions, optimizing the ratio of pixels to improve de-mosaic processing and high-frequency reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a Bayer array color filter is used, then the imaging element can capture color information, but aliasing and color moire occur in high-frequency images
Solution Approach 1:
The imaging element is divided into multiple regions with different color filter arrangements. Specifically, certain pixel regions use a Bayer array while other regions use a different color filter arrangement, allowing each region to be optimized for specific functions and reducing overall aliasing effects
Solution Approach 2:
Different color filter arrangements are applied to different spatial locations within the imaging element. The first color filter arrangement (Bayer array) is used in specific regions while the second arrangement is used in other regions, allowing local optimization to suppress color moire in high-frequency areas while maintaining color capture capability
2Object-affected harmful factors
If an optical low-pass filter is added to remove high frequency, then color moire is reduced, but resolution degrades
Solution Approach 1:
The harmful high-frequency color moire is selectively removed through the color filter arrangement design rather than using an optical low-pass filter. The specific filter pattern extracts and suppresses color moire while preserving the spatial resolution information that would otherwise be lost
Solution Approach 2:
The color filter array itself acts as an intermediary mechanism to suppress color moire. Instead of adding a separate optical low-pass filter that degrades resolution, the patent uses the color filter arrangement as the mediating element to achieve both color capture and color moire suppression
3Object-affected harmful factors
If a three-color random array is used, then color moire is suppressed, but de-mosaic processing becomes complicated
Solution Approach 1:
The color filter arrangement uses periodic patterns (Bayer array in certain regions) rather than completely random arrangements. This periodic structure allows for systematic and simplified de-mosaic processing algorithms while still suppressing color moire through the specific regional distribution of filter types
Data Source
AI summary
According to a color imaging element and an imaging device of the present invention, it is possible to simplify processing in a subsequent stage compared to the case of a random array, improve reproduction precision of de-mosaic processing in a high frequency range, facilitate de-mosaic processing as a result of increase in types of peripheral colors, discern a direction with high correlation between a horizontal direction and a vertical direction, and suppress aliasing upon de-mosaic processing.