Focal plane location in digital holography
Focal plane location in digital holography
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DOI：
10.1117/12.787618
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发表时间：
2007-12
期刊：
影响因子：
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通讯作者：
Yan Yang;B. Kang;Y. Choo
中科院分区：
文献类型：
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作者：
Yan Yang;B. Kang;Y. Choo
本文介绍了粒子数字全息焦平面定位的相关系数法。它利用了相关系数在焦平面处最大的事实。通过对全息图的数值模拟，讨论了影响这种方法的因素。对于真实的全息图，维纳滤波器首先被提出来处理记录全息图和再现图像。应用结果表明，维纳滤波器是处理全息相关图像的一种非常有效的工具。利用标定靶研究了相关系数法确定焦平面时，光斑尺寸和物距对误差的影响。
The correlation coefficient method is introduced to locate the focal plane in digital particle holography. It uses the fact that the correlation coefficient is maximum at the focal plane. The factors influencing this method are discussed with a numerical simulation of holograms. For real holograms, the Wiener filter was first proposed to process both recorded holograms and reconstructed images. The application results using the dot array target showed that the Wiener filter is a very effective tool for processing holography-related images. The effects of the dot size and the object distance on the errors in the determination of the focal plane by the correlation coefficient method were investigated by using the calibration target.