Avalanche Photodiode Imaging Crosstalk Correction and Pixel Interpolation
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Solution Overview
Problem
Imaging devices with avalanche photodiodes suffer from avalanche luminescence, leading to erroneous counting due to secondary electrons affecting neighboring pixels, which deteriorates image quality.
Innovation Solution
An imaging device with a photoelectric conversion element, including an avalanche photodiode, uses processors and memory to generate images, corrects for crosstalk between pixels based on characteristic information, and performs pixel interpolation to address erroneous counting, thereby improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If avalanche photodiode is used for photon counting, then detection sensitivity is improved, but crosstalk between pixels occurs due to avalanche luminescence
Solution Approach 1:
The patent applies preliminary action by pre-calculating crosstalk correction values based on avalanche luminescence characteristics before image acquisition. The system stores correction data in advance and applies it during image processing to eliminate crosstalk effects, preventing erroneous counting rather than correcting it after occurrence
Solution Approach 2:
The patent implements feedback by using detected crosstalk patterns to adjust and refine correction algorithms. The system continuously monitors pixel count values, identifies crosstalk-induced anomalies, and feeds this information back to improve the accuracy of correction calculations for subsequent processing
2Reliability
If crosstalk correction is applied to eliminate erroneous counting, then image quality is improved, but processing complexity increases
Solution Approach 1:
The patent reduces processing complexity by performing preliminary calculations of crosstalk correction factors before actual image processing. Correction matrices and lookup tables are pre-computed based on avalanche luminescence characteristics, allowing fast application during image acquisition without real-time complex calculations
Solution Approach 2:
The patent uses copying by creating simplified models of crosstalk patterns that replicate the complex avalanche luminescence behavior. These simplified models enable efficient correction calculations that mirror the physical crosstalk effects without requiring full computational complexity of the underlying physics
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
The solution effectively corrects for erroneous counting caused by avalanche luminescence, enhancing image quality by accurately processing signals and reducing the influence of crosstalk between pixels.
Implementation Method 1
an imaging device including a photoelectric conversion element including an avalanche photodiode
Implementation Method 2
a phenomenon of avalanche luminescence occurs. When avalanche luminescence occurs, generated secondary electrons are input to neighboring pixels
Data Source
AI summary
An imaging device includes: a photoelectric conversion element including an avalanche photodiode; a generation unit configured to generate an image based on a signal acquired by the photoelectric conversion element; a first correction unit configured to correct the image based on first characteristic information on crosstalk between pixels of the photoelectric conversion element; and a second correction unit configured to perform pixel interpolation of the image based on second characteristic information for determining a crosstalk region to neighboring pixels of a specific pixel and the image.