北京无线电计量测试技术研究所, 北京 100854
针对光子计数系统实现三维成像速度缓慢的问题, 提出一种基于小波树和哈达玛矩阵的自适应快速三维压缩成像方法。利用哈达玛矩阵调制投影图案提高采样效率, 被调制的短脉冲结构光照射场景, 单像素光子计数探测器采集回波。通过分析低分辨率图像的小波树选择采样区域, 使用哈达玛矩阵调制所选采样区域得到的投影图案, 可采集图像细节, 多阶段采样后利用哈达玛反变换恢复出高分辨率图像。实验结果表明, 采集并恢复出一幅512×512像素的三维图像的时间最快可达到41 s。
三维成像 光子计数 小波树 哈达玛矩阵 3D imaging photon counting wavelet tree Hadamard Transform
Author Affiliations
Abstract
1 Jiangsu Key Laboratory of Spectral Imaging & Intelligence Sense (SIIS), Nanjing University of Science and Technology, Nanjing 210094, China
2 Key Laboratory of Intelligent Perception and Systems for High-Dimensional Information of Ministry of Education, Nanjing University of Science and Technology, Nanjing 210094, China
3 e-mail: hewj@mail.njust.edu.cn
In this Letter, free-space optical (FSO) communication using patterned modulation and bucket detection is introduced to improve the bit error rate (BER) performance in complex and noisy environments. The scattered light is averaged in this communication structure. Second-order correlation, wavelet normalization, and compressed sensing are combined in the reconstruction algorithm. A signal with N bits is reconstructed well from much less than N measurements. Numerical simulations and experiments are performed without the narrowband optical filters used in traditional FSO communication. It can also be employed in real networks where secure communication is required. This provides the great opportunity to pave the way for real applications of FSO communication.
060.4510 Optical communications 060.2605 Free-space optical communication Chinese Optics Letters
2016, 14(11): 110607
1 南京理工大学电子工程与光电技术学院微光夜视技术实验室, 江苏 南京 210094
2 南京理工大学紫金学院, 江苏 南京 210046
建立了伪随机码测距的系统测距模型，从光子统计理论出发提出一种新的系统输出信噪比模型。蒙特卡罗算法模拟不同系统死时间下，系统输出信噪比和伪随机码码型的关系。理论模型与蒙特卡罗仿真基本吻合，结果表明信噪比随着伪随机码1的比例增大先增大再减小，选择最佳的发送码型可以获得最佳信噪比。根据新的模型，系统死时间的降低可提高信噪比，光子计数值增大，信噪比先增大再减小。引入系统高斯抖动，重构接收脉冲时间记录值，码速越高单点记录值出现误差的可能性越大，选取1 GHz的码发送速率可完全避免距离数值误差。
遥感 统计光学 激光测距 雪崩触发概率 信噪比模型 系统抖动 光学学报
2014, 34(10): 1012001
