首页> 外文期刊>Optik: Zeitschrift fur Licht- und Elektronenoptik: = Journal for Light-and Electronoptic >Odd symmetrical square-root phase mask to extend the depth of field in wavefront-coded imaging systems
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Odd symmetrical square-root phase mask to extend the depth of field in wavefront-coded imaging systems

机译:奇数对称的平方根相位掩模可扩展波前编码成像系统的景深

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摘要

Extend-the-depth-of-field imaging can be achieved by wavefront coding technique, which inserts an odd symmetrical phase mask into the pupil plane to generate the invariant imaging property over a wide range of defocus. Obtaining the low sensibility to defocus for wavefront coding systems depends on designing a proper phase profile. Here we proposed a phase mask combining the power function with the square-root function to maximize the invariant imaging property to defocus. Judging by defocused modulation transfer function (MTF) and Hilbert space angle, numerical comparisons with the cubic mask, exponential mask and improved logarithmic mask prove the superiority of proposed square-root phase mask in extending the depth of field. (C) 2015 Elsevier GmbH. All rights reserved.
机译:扩展景深成像可以通过波前编码技术实现,该技术将奇数对称的相位掩模插入光瞳平面,以在宽范围的散焦范围内生成不变的成像特性。对于波阵面编码系统而言,获得低散焦敏感性取决于设计适当的相位轮廓。在这里,我们提出了一个相位掩模,将幂函数与平方根函数结合在一起,以最大化不变成像特性来散焦。从散焦调制传递函数(MTF)和希尔伯特空间角来看,与三次掩模,指数掩模和改进的对数掩模的数值比较证明了所提出的平方根相位掩模在扩展景深方面的优越性。 (C)2015 Elsevier GmbH。版权所有。

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