这与摄影上基本的景深原理相矛盾。
This is in conflict with the basic principle of depth of field in photography.
利用轴锥镜能产生无衍射光的特性，分析了将其应用到成像系统中增大景深的原理。
The axcion can produce a non-diffracting beam, and it is used to extend depth of field of optical imaging system, and the theorem of this method is analyzed in this paper.
主要介绍了景深光学成像技术、近轴光学成像原理以及仪器的硬件软件设计。
It mostly introduces the technique of optics imaging in depth of field, the principle of adaxial optics imaging, and the software and hardware's designing.
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