激光半主动单像素成像探测与仿真技术初探
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摘要
基于计算关联成像原理,本文提出了利用结构光照明和图像重构算法升级激光半主动非成像的四象限探测功能,在不改变硬件的前提下使其具备成像的能力。所提出的结构光照明方法包括时间同步与空间编码方法。针对时间同步,通过在结构光发射序列图案的帧头设置触发图案,可使探测信号与激光指示器的结构光图案一一映射或匹配。针对空间编码,给出了散斑编码和二值编码的编码形式。对比分析了三种图像重构算法,包括传统关联成像算法、差分关联成像算法和归一化关联成像算法。分别采用两种编码和归一化关联成像重构算法对典型的64×64像素目标图像进行了仿真,仿真结果表明随着迭代次数的增加恢复图像的峰值信噪比(PNSR)逐渐增加,当迭代4 096次后二值编码的PNSR达11.88 dB。最后提出了激光半主动单像素成像半实物仿真的方法。
Based on ghost imaging principle,the semi-active laser non-imaging quadrant photoelectric detection could be upgraded to be capable of imaging detection without changing its hardware by utilizing structured light illumination and image reconstruct algorithm.First,the semi-active laser single pixel imaging method was proposed including the time synchronization and spatial coding methods.The time synchronization could be implemented by matching the detection signal and the structured light from the laser designator through setting trigger pattern in the frame header.The speckle coding and binary coding methods were described for spatial coding method.Then,three image reconstruction algorithms including the traditional ghost imaging,differential ghost imaging and normalized ghost imaging methods were compared.Moreover,a 64×64 pixels target image reconstruction was simulated by normalized ghost imaging algorithm after the two coding process.The results showed that the Peak Signal to Noise Ratio(PSNR)increased with the iterations.The PNSR from the binary coding reached to11.88 dB after 4 096 iterations.Finally,the hardware-in-the-loop simulation method was proposed for the semi-active laser single pixel imaging detection.
Based on ghost imaging principle,the semi-active laser non-imaging quadrant photoelectric detection could be upgraded to be capable of imaging detection without changing its hardware by utilizing structured light illumination and image reconstruct algorithm.First,the semi-active laser single pixel imaging method was proposed including the time synchronization and spatial coding methods.The time synchronization could be implemented by matching the detection signal and the structured light from the laser designator through setting trigger pattern in the frame header.The speckle coding and binary coding methods were described for spatial coding method.Then,three image reconstruction algorithms including the traditional ghost imaging,differential ghost imaging and normalized ghost imaging methods were compared.Moreover,a 64×64 pixels target image reconstruction was simulated by normalized ghost imaging algorithm after the two coding process.The results showed that the Peak Signal to Noise Ratio(PSNR)increased with the iterations.The PNSR from the binary coding reached to11.88 dB after 4 096 iterations.Finally,the hardware-in-the-loop simulation method was proposed for the semi-active laser single pixel imaging detection.
引文
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[2]刘智颖,邢天祥.激光半主动导引头光学系统设计[J].激光与红外,2016,46(5):527-531.
[3]杨文杰,赵丕福,刘炳臣,等.激光半主动制导技术的应用[J].舰船科学技术,2012,34(12).
[4]PITTMAN TB,SHIH YH,STREKALOV DV,et al.Optical imaging by means of two-photon quantum entanglement[J].Phys Rev,A,1995,52(5):R3429-R3432.DOI:10.1103/physreva.52.r3429.
[5]GATTI A,BRAMBILLA E,BACHE M,et al.Ghost imaging with thermal light:comparing entanglement and classical correlation[J].Phys Rev Lett,2004,93(9):093602.DOI:10.1103/PhysRevLett.93.093602.
[6]康祎,张雷洪.基于压缩感知关联成像的目标检测技术[J].光学仪器,2017,39(6):1-6.
[8]ZHANG Z,ZHONG J.Three-dimensional single-pixel imaging with far fewer measurements than effective image pixels[J].Opt Lett,2016,41(11):2497-2500.DOI:10.1364/ol.41.002497.
[9]施展,樊祥,程正东,等.赝热光场的统计特性及其关联成像理论[J].光电子·激光,2016,27(11):1246-1250.
[11]张红伟,郭树旭,张驰,等.关联成像目标重构的伪逆迭代降噪方法[J].光子学报,2017,46(2):88-95.
[12]孔庆楠,王善德,张驰,等.激光散斑平均尺寸对关联成像重构的影响[J].光学精密工程,2015,23(10z):198-204.