單像素相機在散射介質成像中的應用研究
[Abstract]:The existence of scattering media seriously affects the imaging quality, even can not be imaged completely, so it is very important to study the imaging of scattering media. As a new type of imaging system, single pixel camera has the advantages of low cost, simple system and wide range of application compared with the traditional imaging system. Moreover, the single pixel imaging system only needs to detect the change of the time intensity of different mask loading. In this paper, the single pixel imaging system is applied to scattering medium imaging based on the characteristics of single pixel imaging. The feasibility of the experiment is verified by theoretical analysis and simulation. Finally, an experimental system is set up and the scattering medium imaging is successfully realized. The main work of this paper is as follows: (1) Digital micromirror array is the core device in single-pixel imaging. After introducing the characteristics and parameters of digital micromirror array, the machining process and working principle of digital micromirror array are given. Compared with the similar devices, the advantages and disadvantages of the device are expounded. (2) two typical methods in single-pixel imaging are introduced: compression sensing theory and four-step phase shift theory. Compression sensing theory is a classical theory in single-pixel imaging. This paper introduces the measurement matrix, transmission matrix and reconstruction algorithm, and enumerates the matrix suitable for the application of digital micromirror array. At the same time, a new four-step phase-shift theory is introduced, including its imaging principle, characteristics and reconstruction algorithm. (3) on the basis of theoretical analysis, the feasibility of single-pixel imaging is proved by simulation and experiment. The single-pixel imaging system only needs to detect the change of light intensity, and it is applied to the imaging of scattering medium, and the single-layer scattering medium imaging is successfully realized. By analyzing the scattering characteristics of scattering medium, a two-layer scattering medium imaging system is designed by using its memory effect and four-step phase shift theory. The system is simple in structure. Without complicated time gates and other devices, ballistic photons and snake photons can be distinguished very well, and the experimental cost is reduced effectively, and good results are obtained in the experiment, which proves the feasibility of the system in the imaging of double-layer scattering medium. The noise in the experiment is analyzed and the method to improve the imaging quality of the system is given.
【學位授予單位】:鄭州大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:TB852.1;O436.2
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