基于电子倍增CCD的计算鬼成像方法研究

项目名称： 基于电子倍增CCD的计算鬼成像方法研究

项目编号： No.61501242

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 无线电电子学、电信技术

项目作者： 张闻文

作者单位： 南京理工大学

项目金额： 19万元

中文摘要： 鬼成像技术的抗干扰特性能解决很多传统成像方法无法克服的问题，但在微光条件下仍存在局限性。针对这一技术瓶颈，本项目以微光环境下克服大气扰动成像为目标，在计算鬼成像系统中引入电子倍增CCD作为微光探测器，通过解决扰动环境中信号光场的传输机制、扰动环境中计算鬼成像系统的微光成像特征和计算鬼成像系统的噪声抑制方法三个科学问题，实现抗大气扰动的微光鬼成像探测。提出“退关联度”的概念，揭示目标漫反射效应对信号光场的退化作用，建立微光条件下大气扰动对信号光场的作用模型；分析光子探测起伏，“退关联度”以及大气扰动对计算鬼成像的作用机制，研究微光环境中计算鬼成像系统对大气扰动的抑制特性及抗扰动工作模式，探索空间光编码的设计与优化方法；研究计算鬼成像系统噪声特性，分析起主导作用的噪声源，研究图像降噪算法。本项目将微光成像理论与鬼成像技术相结合，研究成果具有理论和应用价值。

中文关键词： 微光成像；大气扰动；鬼成像

英文摘要： Anti-turbulence characteristics of ghost imaging technology can solve many problems which traditional imaging method could not overcome. However, it still has limitations in low light conditions. We aim to achieve turbulence-free computational ghost imaging in low light level environment by introducing an electron multiplying CCD(EMCCD).Three scientific problems are included: transmission mechanism of signal optics field in atmospheric turbulence, low light level imaging characteristics of computational ghost imaging and noise suppression methods of imaging system. We propose correlation-degraded degree to reveal the degeneration of signal light field due to the target diffuse reflection. The model of atmospheric turbulence disturbing signal optics field in low light level environment is established, which describes the transmission mechanism of signal optics field in turbulence environment. The model of computational ghost imaging system which influenced by correlation-degraded degree, atmospheric turbulence, and photon detection fluctuation is built. Methods of designing and optimizing spatial light encoding are developed. The noise characteristics of computational ghost imaging system are studied. Main noise sources are analized and denoising algorithm is proposed. Combining Low light level imaging theory with ghost imaging technology is a key feature of the project. The research result is significant not only in theory but also in application.

英文关键词： low light level imaging;atmosphere turbulence;ghost imaging