The Design And Realization Of The Related Light Field Of Computational Ghost Imaging

Optical imaging is an important field in optics. With its novel imaging mechanism and its advantages in imaging, ghost imaging has become an active branch in optical imaging. It provides us a new imaging principle much different from the conventional optical imaging, namely imaging incorporating two beams in two different optical paths. The “none-localization” mechanism makes ghost imaging a lot of advantages that the conventional optical imaging system doesn't have. The ghost imaging gradually finds its way in applications, such as high-resolution lithography, cryptology, stealth technology, optical radar, resistance to atmospheric disturbances, etc.Ghost imaging is divided into two types, namely quantum imaging and pseudothermal light imaging. Quantum imaging depends on the entangled photon pairs. Pseudothermal light imaging just uses the classical light fields. In this paper, we study a special kind of pseudothermal light imaging—computational ghost imaging, which suits to the macro object imaging and has a broader practical application. Especially we study the design and implementation of the light fields in computational ghost imaging.First of all, we study the principle of computational ghost imaging, and design the whole system. Especially a 4f subsystem is incorporated into the traditional computing ghost imaging system. The corresponding software is also completed. Secondly, the method is studied of generating a specific optical light field distribution based on the computer-generated holograph. The holograph is obtain by Fourier optics and diffraction optics, and implemented by spatial optical modulator. Finally, different sets of distributions of optical light fields or light field templates using in computational ghost imaging are designed for one-dimensional and two-dimensional objects. Using the designed sets of light distributions, images of objects are reconstructed in our designed computational ghost imaging system with the help of algorithm of compressed sensing. The experiments are respectively made for one-dimensional and two-dimensional objects.The experimental results show that the smaller the optical light spots in light field templates, the higher the resolution of the system. At the same time, the results are compared in same systems but with 4f-system and one without 4f-system. Experimental results show that systems with 4f-system give better image than that without.