基于EMCCD的光子计数成像方法与实验  

Method and experiment of photon counting imaging based on EMCCD

作　　者：张磊[1,2] 石峰 邹燕 张龙[1,2] 何伟基[1] 程宏昌 顾国华[1] 陈钱[1] 

机构地区：[1]江苏省光谱成像与智能感知重点实验室南京理工大学,江苏南京210094 [2]微光夜视技术重点实验室,陕西西安710065 [3]总装南京军代局,江苏南京210024

出　　处：《红外与激光工程》2015年第1期384-390,共7页Infrared and Laser Engineering

基　　金：微光夜视技术重点实验室开放基金(J110508;J20130501);国家自然科学基金(61101196;61271332)

摘　　要：讨论了在复杂背景条件下采用EMCCD实现光子计数成像的处理策略,提出了一种双重阈值滤波方法并通过实验验证了其有效性。根据EMCCD的成像模型,将EMCCD的输出图像表示为光子事件、偏置噪声和伪光子噪声事件的集合。通过采集多幅EMCCD的输出图像,将光子事件检测问题转化为标准的二元假设检测问题。利用贝叶斯判决,可以得到光子事件检测的最佳检测法则,使光子事件的误判代价达到最小,从而检测出光子事件及其空间分布特征。通过实验对比可以发现:提出的方法明显优于普通的累加积分方法,适合生物微光检测等超低照度条件下的成像领域。In this paper, a double-threshold filter strategy was proposed and experimentally tested to improve the accuracy of photon counting imaging with an electron multiplying charge-coupled device, by taking into account the addition bias noise and Pseudo-photon noise during photon counting mode. Photon counting event detection was achieved by using amplitude threshold and frequency threshold filter to eliminate the bias noise and Pseudo-photon noise. Based on Bayesian estimation on multi-imaging, an optimal detection rule was found with minimum error cost. Experiment indicates that double-threshold filter strategy improves the photon detection accuracy than usual integrate method, and is suitable for imaging in ultra-low-light conditions such as biological dim light detection.

关 键 词：电子倍增CCD 光子计数成像 双重阈值滤波 微弱光检测 

分 类 号：TN223[电子电信—物理电子学]