Image Sensor Color Correction via Regional Matrix Segmentation
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Solution Overview
Problem
Conventional image sensors do not account for variations in color perception errors due to different locations of pixels on a pixel array, even when illuminated by the same light source, leading to inadequate color correction.
Innovation Solution
A color correction device that divides the image sensor into regions, using a quantum efficiency measurement circuit, addressing circuit, and correction circuit to generate and apply a color correction matrix specific to each region based on pixel locations, averaging color signals from pixels within each region to correct color signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single color correction matrix is used for the entire image sensor, then device complexity is reduced, but color perception accuracy deteriorates due to location-dependent variations
Solution Approach 1:
The image sensor is divided into multiple regions (e.g., first region and second region), and each region is assigned a dedicated color correction matrix. This segmentation allows each matrix to be optimized for its specific region's characteristics, improving color perception accuracy while managing complexity through structured division
Solution Approach 2:
Different color correction matrices are applied to different regions of the image sensor based on their specific location characteristics. Each pixel's color correction is determined by its regional properties, ensuring locally optimized color accuracy rather than a one-size-fits-all approach
2Adaptability or versatility
If multiple color correction matrices are predetermined for different light sources, then adaptability to different lighting conditions improves, but device complexity increases
Solution Approach 1:
The color correction device is designed to handle multiple light sources and multiple regions within a single integrated system. The correction circuit can selectively apply appropriate matrices based on both light source type and pixel location, providing universal functionality without requiring separate correction systems for each condition
Solution Approach 2:
The color correction device dynamically selects and switches between different color correction matrices based on detected light source characteristics and pixel location. This dynamic adaptation allows the system to respond to changing lighting conditions and spatial variations without manual intervention
Data Source
AI summary
A color correction device for an image sensor is provided. The image sensor is divided into regions. The color correction device includes a quantum efficiency (QE) measurement circuit, an addressing circuit, and a correction circuit. The QE measurement circuit generates a color signal according to a sensing signal from each pixel of the image sensor. The addressing circuit receives the color signal corresponding to each pixel, obtains a location of each pixel on the image sensor, and averages all of the color signals corresponding to the pixels whose locations are disposed in one of the regions to obtain an average color signal. The correction circuit receives the average color signal to obtain a color correction matrix of the one of the regions and corrects the color signals of the pixels whose locations are in the one of the regions by the color correction matrix.