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首页> 外文会议>Conference on Optical Design and Engineering; Sep 30-Oct 3, 2003; St.Etienne, France >Amplitude and phase filters for mitigation of defocus and third-order aberrations
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Amplitude and phase filters for mitigation of defocus and third-order aberrations

机译：振幅和相位滤波器可减轻散焦和三阶像差

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摘要

This paper gives a review on the design and use of both amplitude filters and phase filters to achieve a large focal depth in incoherent imaging systems. Traditional optical system design enhances the resolution of incoherent imaging systems by optical-only manipulations or some type of post-processing of an image that has been already recorded. A brief introduction to recent techniques to increase the depth of field by use of hybrid optical/digital imaging system is reported and its performance is compared with a conventional optical system. This technique, commonly named wavefront coding, employs an aspherical pupil plane element to encode the incident wavefront in such a way that the image recorded by the detector can be accurately restored over a large range of defocus. As reported in earlier work, this approach alleviates the effects of defocus and its related aberrations whilst maintaining diffraction-limited resolution. We explore the control of third order aberrations (spherical aberration, coma, astigmatism, and Petzval field curvature) through wavefront coding. This method offers the potential to implement diffraction-limited imaging systems using simple and low-cost lenses. Although these performances are associated with reductions in signal-to-noise ratio of the displayed image, the jointly optimised optical/digital hybrid imaging system can meet some specific requirements that are impossible to achieve with a traditional approach.
机译：本文综述了振幅滤波器和相位滤波器在无相干成像系统中实现大焦深的设计和使用。传统的光学系统设计通过仅进行光学操作或对已经记录的图像进行某种类型的后处理，从而提高了非相干成像系统的分辨率。报告了通过使用混合光学/数字成像系统来增加景深的最新技术的简要介绍，并将其性能与常规光学系统进行了比较。该技术通常称为波阵面编码，它采用非球面光瞳平面元件对入射波阵面进行编码，以使检测器记录的图像可以在很大的散焦范围内准确恢复。如早期工作中报道的那样，这种方法减轻了散焦及其相关像差的影响，同时保持了衍射极限分辨率。我们通过波前编码探索了对三阶像差（球差，彗差，像散和Petzval场曲）的控制。该方法提供了使用简单且低成本的透镜来实现衍射受限成像系统的潜力。尽管这些性能与所显示图像的信噪比的降低有关，但共同优化的光学/数字混合成像系统可以满足某些传统方法无法实现的特定要求。

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