Research On Critical Technologies And New Methods Of Three-dimensional(3D)correlation Imaging

In recent years, correlation imaging(or ghost imaging) has received great attention and achieved considerable development. As a nonlocal imaging method, compared to traditional linear optical imaging, correlation imaging has a series of advantages as well as features, such as strong anti-noise capacity, capability of breaking through the diffraction limit, imaging below the Nyquist sampling limit, weak light imaging and so on. Due to its great potential, the focus of GI is increasingly shifting from fundamental research to its practical applications. There have been many great advancements on the exploration and development of GI in remote sensing, biomedical imaging, optical encryption, etc. Specifically, the acquirement of three-dimensional(3D) object information is of great important in a variety of fields. Therefore, the research on 3D correlation imaging is attractive and significant.Our paper focuses on the research on the critical technologies and the new methods of 3D correlation imaging, mainly including the following aspects:1) Research on the different correlation imaging mechanisms and corresponding implementations respectively in the near or far field. In the near field, 3D correlation imaging usually acquires 3D slices to reconstruct the object by utilizing the 3D correlation properties of thermal light. It can be realized by traditional thermal 3D correlation imaging and computational 3D correlation imaging; In the far field, it usually obtains the longitudinal and transverse information by combining the laser ranging principle,and retrieve 3D objects.2) Research specifically on the critical technologies of remote 3D correlation imaging system. We propose a computational system based on digital micro-mirror device(DMD), and analyse in detail each module, including the emission parts, atmo-spheric propagation, receiving module, algorithms, etc. We also test the performance of our system outdoor, and finally achieve high 3D imaging resolution of remote objects.3) Propose and experimentally demonstrate various novel 3D correlation imaging methods, including:? Periodic diffraction 3D correlation imaging. Based on periodic diffraction effect, we realize 3D imaging through scattering media with simple and low-cost devices;? Binocular parallax 3D correlation imaging. Based on correlation algorithm,we improve the image matching method in traditional binocular parallax stereo imaging, and achieve high 3D resolution imaging of objects with smooth surface;? Polarization difference 3D correlation imaging. Based on polarization effect, we make traditional correlation imaging able to distinguish visually similar but different objects and enhance contrast by removing the background, and investigate its applicability on 3D correlation imaging.These methods apply to different applications, further facilitating the practical applications of 3D correlation imaging.