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首页> 外文会议>Conference on Optical Design and Testing; 20071112-15; Beijing(CN) >Research on Design of Optimum Phase Mask for Wave-front Coded Imaging System
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Research on Design of Optimum Phase Mask for Wave-front Coded Imaging System

机译：波前编码成像系统最佳相位掩模的设计研究

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摘要

Wave-front coding is a system level design method which can be used to extend the depth of field of an incoherent optical system. By attaching a phase mask to the aperture, the optical transfer function can not only be made insensitive to misfocus, but also can avoid the isolated zeros caused by defocus. With this modified optical transfer function, a purposely blurred image can be obtained and its corresponding clear one with large depth of focus can be generated through digital processing techniques, such as direct inverse filtering, wiener filtering and maximum entropy restoration and so on. This is why the wave-front coded imaging system is called optical/digital hybrid imaging system as well. The most important part of the system design lies in the design of phase masks. So far, many kinds of phase masks have been suggested; among all those types, two are classical: cubic-phase-mask and logarithmic-phase-mask. However, whether an optimum phase mask exists or not is still a question that is not answered yet. This paper focuses on this question and tries to find one answer. In this paper, considering several critical factors and with the help of a simulation program developed by ourselves, we make a comparison among the performance of different phase masks and finally propose a prototype phase mask whose performance is acceptable in several aspects.
机译：波前编码是一种系统级设计方法，可用于扩展非相干光学系统的景深。通过在孔上安装一个相位掩模，不仅可以使光学传递函数对散焦不敏感，而且还可以避免散焦导致的孤立零点。借助这种改进的光学传递函数，可以通过数字处理技术（例如直接逆滤波，维纳滤波和最大熵恢复等）来获得有目的的模糊图像，并生成具有较大景深的相应清晰图像。这就是为什么波前编码成像系统也被称为光学/数字混合成像系统的原因。系统设计中最重要的部分在于相位掩模的设计。到目前为止，已经提出了多种相位掩模。在所有这些类型中，有两种是经典的：立方相位掩码和对数相位掩码。然而，是否存在最佳相位掩模仍然是尚未回答的问题。本文着眼于这个问题，并试图找到一个答案。在本文中，考虑到几个关键因素，并借助我们自己开发的仿真程序，我们对不同相位掩模的性能进行了比较，最后提出了原型掩模，其性能在几个方面都可以接受。

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