Image Processing for Remosaic Crosstalk Correction
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Solution Overview
Problem
The remosaic algorithm suffers from image quality degradation due to crosstalk issues, particularly when an image sensor receives light with ultra-short or ultra-long wavelengths, leading to a quadrangular grid phenomenon.
Innovation Solution
An image processing device and method that corrects pixel values by using reference color ratios and crosstalk values to reduce crosstalk, employing a processor to adjust pixel values based on differences in color ratios and crosstalk weights.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the remosaic algorithm is used to compensate for red and blue pixels using green pixels, then pixel value imbalance can be addressed, but crosstalk occurs causing quadrangular grid phenomenon and image quality degradation
Solution Approach 1:
The patent changes the parameter approach by introducing wavelength-specific crosstalk correction values and color ratio adjustments. Different correction parameters are applied based on the wavelength of incident light, allowing the system to adaptively compensate for crosstalk effects without degrading image quality.
Solution Approach 2:
The patent implements feedback mechanisms by measuring actual pixel values and comparing them against expected values. The system uses the difference between measured and expected values to dynamically adjust correction parameters, thereby reducing crosstalk effects while maintaining measurement precision.
2Adaptability or versatility
If the image sensor receives light with ultra-short or ultra-long wavelengths, then spectral range is extended, but green pixel acquires very low values and crosstalk increases
Solution Approach 1:
The patent applies wavelength-specific correction parameters that change based on the spectral characteristics of incident light. For ultra-short and ultra-long wavelengths, the system adjusts crosstalk correction values and color ratios to maintain reliable pixel value measurement across the extended spectral range.
Solution Approach 2:
The patent performs preliminary correction by pre-calculating and storing crosstalk correction values for different wavelength ranges. When ultra-short or ultra-long wavelength light is detected, the system retrieves the appropriate pre-computed correction parameters to immediately compensate for crosstalk effects before final pixel value output.
Data Source
AI summary
An image processing device includes a memory for storing reference color ratios and crosstalk values of each of light source images acquired by sensing light sources having different wavelengths. The image processing device also includes a processor for receiving an image including a plurality of regions each including outer pixel values and inner pixel values of the same color, and correcting the outer pixel values or the inner pixel values by using difference values between the respective reference color ratios and a color ratio of the image as weights of the crosstalk values.