Image Sensor YGB Color Filter Array Noise Reduction
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Solution Overview
Problem
Conventional image sensors with RGB detecting systems face challenges in matching spectral sensitivity functions with desired color spaces, leading to color errors and increased noise variance during color correction.
Innovation Solution
Implementing a YGB detecting system with a color filter array that includes yellow, green, and blue filters, where the yellow filter also responds to red light, and using a specific color correction matrix to transform raw color images into the desired color space, reducing noise variance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an RGB detecting system is used, then color detection capability is provided, but spectral sensitivity functions do not match desired color spaces leading to color errors and increased noise variance
Solution Approach 1:
The patent changes the spectral parameters of the color filters from conventional RGB to YGB configuration. The yellow filter has a spectral response that covers both red and green wavelengths, while the green and blue filters maintain their respective wavelength ranges. This parameter change in filter spectral characteristics enables better matching with human visual system and desired color spaces, reducing color errors and noise variance during color correction.
2Ease of manufacture
If conventional color filter arrays are used, then manufacturing is simplified, but spectral response does not optimize color accuracy
Solution Approach 1:
The patent applies local quality by giving different spectral characteristics to different filters within the same color filter array structure. The yellow filter is designed with a broad spectral response covering red and green wavelengths, while green and blue filters have more narrow responses. This localized differentiation in filter properties enables optimized spectral response matching without requiring complete redesign of the entire imaging system, maintaining ease of manufacture while improving color accuracy.
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
Enhances spectral response and reduces noise variance by optimizing the color correction matrix for the YGB system, ensuring better color accuracy and signal intensity.
Implementation Method 1
Each of the first, second, and third unit cells includes at least one first yellow filter configured to transmit a green component and a red component of incident light
Implementation Method 2
The light receiving element is configured to convert the incident light transmitted by the color filter array into electric signals
Data Source
AI summary
An image sensor includes a color filter array and a light receiving element. The color filter array includes plural repeating unit cells including first, second, and third unit cells. The first and second unit cells are adjacent to each other in a first direction, the second and third unit cells are adjacent to each other in a second direction transverse to the first direction. Each of the first, second, and third unit cells includes at least one first yellow filter configured to transmit a green component and a red component of incident light, and each of the first, second, and third unit cells does not comprise a red filter configured to transmit the red component of the incident light. The light receiving element is configured to convert the incident light transmitted by the color filter array into electric signals.