Compressed sensing for ultra-weak light counting imaging

YU Wen-kai; YAO Xu-ri; LIU Xue-feng; ZHAI Guang-jie; ZHAO Qing

doi:10.3788/OPE.20122010.2283

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Compressed sensing for ultra-weak light counting imaging

Article | 更新时间：2020-08-12

- Compressed sensing for ultra-weak light counting imaging
- Optics and Precision Engineering Vol. 20, Issue 10, Pages: 2283-2292(2012)
- 作者机构：
  
  1. 中国科学院大学北京,中国,100049
  2. 中国科学院空间科学与应用研究中心空间科学实验技术研究室北京,100190
  3. 中国科学院国家空间科学中心空间科学实验技术研究室北京,100190
  4. 北京理工大学物理学院北京,100081
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20122010.2283
  CLC： TH724;TP391
- Received：20 June 2012，
  
  Revised：18 July 2012，
  
  Published：10 October 2012
- 稿件说明：
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俞文凯, 姚旭日, 刘雪峰, 翟光杰, 赵清. 压缩传感用于极弱光计数成像[J]. 光学精密工程, 2012,20(10): 2283-2292

YU Wen-kai, YAO Xu-ri, LIU Xue-feng, ZHAI Guang-jie, ZHAO Qing. Compressed sensing for ultra-weak light counting imaging[J]. Editorial Office of Optics and Precision Engineering, 2012,20(10): 2283-2292
俞文凯, 姚旭日, 刘雪峰, 翟光杰, 赵清. 压缩传感用于极弱光计数成像[J]. 光学精密工程, 2012,20(10): 2283-2292 DOI： 10.3788/OPE.20122010.2283.

YU Wen-kai, YAO Xu-ri, LIU Xue-feng, ZHAI Guang-jie, ZHAO Qing. Compressed sensing for ultra-weak light counting imaging[J]. Editorial Office of Optics and Precision Engineering, 2012,20(10): 2283-2292 DOI： 10.3788/OPE.20122010.2283.

摘要

为解决灵敏度达到单光子水平的面阵探测器件其单位像素上灵敏度有限和测量数多等问题

研制了具有极高灵敏度的成像系统来实现欠采样的极弱光成像探测。该成像系统基于光子计数成像技术和压缩感知理论

利用数字微镜器件(DMD)完成随机空间光调制

通过单光子点探测器收集光子

以计数形式记录下光强值。然后

利用算法重建出极弱光照明下的图像。文中设计了相关实验

研究了测量数、光强极弱程度和测量时间对成像质量的影响。最后

引入了图像质量评价标准和系统信噪比

分析对比了实验数据。结果表明

当测量数高于信号总维度的19.5%时

系统能完美成像

信噪比可低至2.843 8 dB

DMD单位像素上的平均光子数可低于1.106 count/s

成像的关键在于信号的波动大于噪声的波动。该成像系统基本满足了极弱光成像探测在光强、灵敏度和采样数等方面的要求。

Abstract

Since array detectors with sensitivity to single photon level were limited by sensitivity on each pixel and needed large number of measurements

an imaging system with high sensitivity was designed to realize under-sampling ultra-weak light imaging detection. This imaging system based on photon counting technique and compressed sensing theory employed a Digital Micromirror Device(DMD) to complete the random spatial light modulation

and used a single photon point detector to collect photons. The total light intensity was recorded by the form of photon counting. Then

the image of an object under ultra-weak light illumination could be reconstructed by an algorithm. The influences of the number of measurements

ultra-weak light intensity level and measurement time on the quality of imaging were investigated by experiments. Furthermore

the evaluation criterion of reconstructed image and the Signal to Noise Ratio (SNR) of the system were discussed to analyze the experimental data.The experimental results show that when the number of measurements is greater than 19.5 percent of the dimension of data

it can acquire a good reconstruction

the SNR of the system can be even decreased to 2.843 8 dB

and the average count of photons on each pixel of the DMD can be lower than 1.106 count/s.Experiments also prove that the key of imaging lies in the fact that the fluctuation of signal should be greater than the fluctuation of noise. It concludes that this imaging system meets the demand of ultra-weak light imaging detection for ultra-weak light intensity

high sensitivity and few measurements.

关键词

Keywords

references

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