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Extending the field of view by a scattering window in an I-COACH system

机译：在I-Coach系统中通过散射窗口扩展视野

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摘要

Interferenceless coded aperture correlation holography (I-COACH) is an incoherent digital holography technique developed to record and reconstruct 3D images of objects without two-wave interference. Herein, we introduce a novel technique to extend the field of view (FOV) of I-COACH beyond the limit imposed by the ratio between the finite area of the image sensor and the magnification of the optical system. Light diffracted from a point object located on the optical axis is modulated by a pseudorandom coded phase mask, and the central part of the point spread hologram (PSH) on the image sensor is recorded. The point object is shifted laterally to predetermined lateral locations in order to collect the exterior parts of the PSH. The recorded PSHs are stitched together to produce a synthetic PSH (SPSH) with an area nine times that of any individual PSH recorded by the image sensor. An object with a lateral extent beyond the FOV limit of the image sensor is placed at the same axial location as the point object, and the object hologram is recorded. The object is reconstructed by a cross-correlation between the zero-padded object hologram and the SPSH. Hence, the object parts beyond the FOV limit of the image sensor are recovered. An SPSH library is created for different axial planes, and the corresponding axial planes of the object are reconstructed. (C) 2018 Optical Society of America
机译：干涉编码孔径相关全息术（I-Coach）是一种不连贯的数字全息技术，用于记录和重建对象的3D图像而没有两波干干扰。这里，我们介绍一种新颖的技术来扩展I-Coach的视野（FOV）超出通过图像传感器的有限区域与光学系统的放大率施加的极限。从位于光轴上的点对象衍射的光被伪随机编码相位掩模调制，并且记录了图像传感器上的点扩展全息图（PSH）的中心部分。点对象横向移动到预定的横向位置，以收集PSH的外部​​。记录的PSH被缝合在一起以产生合成的PSH（SPSH），其面积为图像传感器记录的任何单独的PSH的区域。具有超出图像传感器的FOV极限的横向范围的物体放置在与点对象相同的轴向位置处，并记录对象全息图。通过零填充物体全息图和SPSH之间的互相关来重建该对象。因此，回收超出图像传感器的FOV极限的对象部分。为不同的轴平面产生SPSH库，并且重建对象的相应轴向平面。 （c）2018年光学学会

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  • 来源
    《Optics Letters》 |2018年第5期|共4页
  • 作者

    Rai Mani Ratnam; Vijayakumar A.; Rosen Joseph;

  • 作者单位

    Ben Gurion Univ Negev Dept Elect &

    Comp Engn POB 653 IL-8410501 Beer Sheva Israel;

    Ben Gurion Univ Negev Dept Elect &

    Comp Engn POB 653 IL-8410501 Beer Sheva Israel;

    Ben Gurion Univ Negev Dept Elect &

    Comp Engn POB 653 IL-8410501 Beer Sheva Israel;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 计量学;光学;
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