Crosstalk Processing Module for Image Sensors
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Solution Overview
Problem
Current image sensors with multi-photodiode architecture face challenges in efficiently processing crosstalk, which affects image quality and storage requirements due to the complexity of signal correction and storage needs.
Innovation Solution
A crosstalk processing module is introduced, comprising a correction element generation unit, storage, and crosstalk correction check unit, which separates the image signal into channel image signals, generates seed values and correction parameters, and corrects crosstalk based on representative channel image signals, reducing storage space and access requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multi-photodiode architecture is used to improve image quality, then crosstalk correction complexity increases and storage requirements increase
Solution Approach 1:
The image signal is separated into multiple channel image signals corresponding to different color channels. Seed values and correction parameters are generated for each channel separately, allowing independent processing that simplifies the overall correction complexity while maintaining high image quality.
Solution Approach 2:
Seed values and correction parameters are generated in advance based on representative channel image signals before actual crosstalk correction is needed. This preliminary preparation reduces real-time processing complexity and enables efficient correction when processing the full image signal.
2Measurement precision
If multi-photodiode architecture is used to improve image quality, then storage space requirements increase
Solution Approach 1:
Instead of storing complete correction data for all image signals, the system generates and stores only seed values and correction parameters derived from representative channel image signals. These compact representations serve as copies that enable full signal correction without requiring proportional storage space.
Solution Approach 2:
Correction elements are generated in advance from representative signals and stored in a storage unit. This allows the system to use minimal stored data (seed values and parameters) to correct the entire image signal, dramatically reducing storage requirements compared to storing complete correction data for all pixels.
3Measurement precision
If detailed crosstalk correction is applied to improve image quality, then processing time increases
Solution Approach 1:
Seed values and correction parameters are generated in advance from representative channel image signals and stored for later use. When processing the full image signal, these pre-generated elements are applied directly, eliminating the need to recalculate correction data and significantly reducing processing time.
Solution Approach 2:
The correction process is divided into two phases: an initial phase where seed values and parameters are generated from representative signals, and a subsequent phase where these elements are applied to the full image signal. This segmentation allows computationally intensive operations to be performed once rather than repeatedly for every pixel.
Data Source
AI summary
A crosstalk processing module configured to process a crosstalk of an image signal includes a correction element generation unit, a storage, and a crosstalk correction check unit. The correction element generation unit receives the image signal and input information associated with at least a size of the image signal and generates seed values and correction parameters which are used to correct the crosstalk, based on the input information and a representative channel image signal obtained by separating the image signal with respect to color. The storage stores the seed values and the correction parameters. The crosstalk correction check unit receives the image signal, receives the seed values and the correction parameters from the storage, corrects the crosstalk, and outputs a final image signal and pass/fail information indicating a pass or fail of the correction of the crosstalk based on a plurality of reference values.