EXTENDED DEPTH OF FIELD THROUGH WAVE-FRONT CODING
EXTENDED DEPTH OF FIELD THROUGH WAVE-FRONT CODING
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DOI：
10.1364/ao.34.001859
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发表时间：
1995-04-10
期刊：
影响因子：
1.9
通讯作者：
CATHEY, WT
中科院分区：
文献类型：
--
作者：
DOWSKI, ER;CATHEY, WT
我们设计了一种光学-数字系统，提供了大景深的近衍射成像性能。该系统是标准的非相干光学系统，由相位掩模进行修改，并对产生的中间图像进行数字处理。该相位掩模以这样一种方式改变或编码接收到的非相干波前，即点扩展函数和光学传递函数不会作为失焦的函数而显著改变。中间图像的聚焦无关数字滤波被用来产生具有近乎衍射限制的点扩展函数的组合光学-数字系统。这种高分辨率扩展景深是通过增加非相干系统的动态范围来获得的。我们同时使用模糊函数和平稳相位法来设计这些相位掩模。
We designed an optical-digital system that delivers near-diffraction-limited imaging performance with a large depth of field. This system is the standard incoherent optical system modified by a phase mask with digital processing of the resulting intermediate image. The phase mask alters or codes the received incoherent wave front in such a way that the point-spread function and the optical transfer function do not change appreciably as a function of misfocus. Focus-independent digital filtering of the intermediate image is used to produce a combined optical-digital system that has a nearly diffraction limited point-spread function. This high-resolution extended depth of field is obtained through the expense of an increased dynamic range of the incoherent system. We use both the ambiguity function and the stationary-phase method to design these phase masks.