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超分辨技术中现有的纯振幅型或纯相位型光瞳滤波器,大部分只能实现轴向或横向超分辨而不能实现三维超分辨,三维超分辨在三维成像系统中有着重要的作用。因此为提高成像系统中的三维分辨能力,设计了一种复振幅光瞳滤波器,并对其三维超分辨性能进行了研究。详细分析了该光瞳滤波器的第一区半径和透射率对施特雷尔比、轴向和横向超分辨因子以及旁瓣能量的影响。通过一系列的模拟证明,借助于复振幅光瞳滤波器可以实现三维超分辨。该滤波器的优点是容易实现三维超分辨,且有比较高的施特雷尔比,缺点是三维超分辨的实现总是伴随着旁瓣能量的增加,但可以采用共焦扫描成像系统来加以抑制。
Most of existing pure amplitude or pure phase pupil filters in super-resolution technology can only achieve three-dimensional super-resolution in axial or lateral super-resolution, and three-dimensional super-resolution plays an important role in three-dimensional imaging system. Therefore, to improve the three-dimensional resolution in imaging system, a complex amplitude pupil filter is designed and its three-dimensional super-resolution performance is studied. The effects of the radius and transmittance of the first region of the pupil filter on the Streep ratio, axial and transverse super-resolution factors, and sidelobe energy are analyzed in detail. Through a series of simulations, three-dimensional super-resolution can be realized by means of complex amplitude pupil filter. The advantage of this filter is that it is easy to realize three-dimensional super-resolution and has a relatively high Strain Ratio. The disadvantage is that the realization of three-dimensional super-resolution is always accompanied by the increase of side-lobe energy, but the confocal scanning imaging system can be used inhibition.