基于空间光调制器的散斑相关成像研究

Research on Speckle Correlation Imaging Based on Spatial Light Modulator

为了实现对隐藏在散射介质后方的静态目标物体的高分辨率重构以及动态目标物体的重构和实时追踪,避免利用旋转毛玻璃产生赝热光源的不可预置性和机械振动对成像质量的影响,将空间光调制器应用到散斑相关成像系统中来产生赝热光场,对静态目标成像以及动态目标追踪进行了实验研究。其中动态目标追踪的偏差率在很小的范围内,最小可达0.38%。在图像重构过程中,采用基于扫描近似信息传递的相位恢复算法来提高运算速度和图像鲁棒性。对比了基于相位和振幅两种调制方式产生的赝热光源质量和图像重构质量,实验结果表明,基于相位调制产生的赝热光源质量更好,对应的重构图像分辨率更佳。

In order to realize the high-resolution reconstruction of static target objects hidden behind the scattering medium and the reconstruction and real-time tracking of dynamic target objects,avoid the unpredictability of pseudo-thermal light sources generated by rotating ground glass and the impact of mechanical vibration on imaging quality,a spatial light modulator is applied to the speckle-related imaging system to generate the pseudo-thermal light field,enabling imaging of static and dynamic targets.The error rate of dynamic target tracking is within a very small range,the minimum can reach 0.38%.In the image reconstruction process,a phase recovery algorithm based on phase retrieval with the swept approximate message passing algorithm is adopted to improve the calculation speed and image robustness.Comparison of the quality of the pseudo-thermal light source and image reconstruction based on phase and amplitude modulation methods is conducted,the result shows that the quality of the pseudo-thermal light source based on phase modulation is better,as well as the corresponding reconstructed image resolution.