Imaging System Photon Counting Mode Switching
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Solution Overview
Problem
Current low light level imaging technologies face limitations in varying lighting conditions, particularly at low photon flux levels, where signal-to-noise ratio degrades, leading to unusable images due to detector noise and limited dynamic range.
Innovation Solution
An imaging system that dynamically switches between conventional, natural photon counting, and forced photon counting modes by adjusting parameters such as integration time, acquisition rate, and optical settings to optimize image quality across different lighting conditions, utilizing binarization and amplification techniques to enhance sensitivity and dynamic range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional imaging mode is used, then image quality is maintained at high light levels, but image quality degrades at low light levels due to detector noise
Solution Approach 1:
The system dynamically switches between conventional imaging mode and photon counting mode based on the detected light level. This dynamic adaptation allows the system to optimize performance for each lighting condition, using conventional mode for high light levels and photon counting mode for low light levels to maintain image quality across varying illumination conditions.
Solution Approach 2:
The system changes the operating parameters of the detector by switching between two distinct modes: conventional imaging mode for high photon flux and photon counting mode for low photon flux. This parameter change allows the system to adapt to varying light levels and maintain optimal signal-to-noise ratio across different illumination conditions.
2Measurement precision
If photon counting mode is used, then sensitivity is enhanced at low light levels, but dynamic range is reduced
Solution Approach 1:
The system dynamically selects between photon counting mode and conventional imaging mode based on the current light level. This dynamic switching enables the system to achieve high sensitivity when needed (low light levels) while maintaining full dynamic range capability when light levels are high, thus resolving the trade-off between sensitivity and dynamic range.
Solution Approach 2:
The imaging system is designed to perform multiple functions by incorporating both photon counting capability and conventional imaging capability in a single system. This multi-functionality allows the system to handle both low light level applications (requiring high sensitivity) and high light level applications (requiring full dynamic range) with the same device.
3Measurement precision
If integration time is increased to improve low light imaging, then sensitivity improves, but frame rate decreases
Solution Approach 1:
The system changes the detection parameter from conventional intensity measurement to photon counting at low light levels. This parameter change allows the system to achieve high sensitivity with shorter integration times because photon counting is inherently more efficient at detecting low photon flux, thus maintaining higher frame rates while improving sensitivity.
4Measurement precision
If pixel area is increased to improve low light detection, then sensitivity improves, but spatial resolution decreases
Solution Approach 1:
The system changes the detection parameter to photon counting mode, which increases the effective detection efficiency of each pixel without changing the physical pixel area. This parameter change allows the system to achieve high sensitivity while maintaining the original spatial resolution defined by the pixel array geometry.
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 system improves image quality and dynamic range by adapting to changing lighting conditions, reducing noise and enhancing sensitivity, allowing for effective imaging from high to low photon flux levels.
Implementation Method 1
the photoelectrons generated by the photoelectric detection process implemented in the detector
Implementation Method 2
EMCCD: CCD Matrix with an Electron Multiplier which gives an amplification by avalanche on the multiplexed signal
Data Source
Figure 1
Figure 2a~2b
Figure 3
AI summary
The invention relates to a method for imaging a scene using an imaging system making it possible to obtain an image of the scene, the imaging system comprising a device for acquiring frames according to acquisition parameters, and a unit for processing the acquired frames. The method comprises the steps: A) selection of an imaging mode from among a conventional imaging mode, a natural photon-counting imaging mode and a forced photon-counting imaging mode, and, depending on the selected imaging mode, determination by the processing unit of corresponding acquisition parameters, B) acquisition of at least one frame by the acquisition device parameterized with said acquisition parameters, and transmission of the frames that were acquired to the processing unit in order to obtain an image, the image being obtained at the end of the following sub-steps if the selected imaging mode is the natural photon-counting imaging mode or the forced photon-counting imaging mode: -binarization of the frames that were acquired and -summing the binarized frames to obtain an image, C) estimation of the quality of the image obtained, D) D1) depending on the quality of the image obtained, determining a new imaging mode selected among the conventional imaging mode, the natural photon-counting imaging mode, and the forced photon-counting imaging mode, D2) repeating steps A, B, C and D with the new imaging mode selected as the imaging mode.