CNR-Istituto Nazionale di Ottica, via Campi Flegrei 34, 80078 Pozzuoli (NA), Italy.
Opt Lett. 2011 May 15;36(10):1945-7. doi: 10.1364/OL.36.001945.
The searching and recovering of the correct reconstruction distance in digital holography (DH) can be a cumbersome and subjective procedure. Here we report on an algorithm for automatically estimating the in-focus image and recovering the correct reconstruction distance for speckle holograms. We have tested the approach in determining the reconstruction distances of stretched digital holograms. Stretching a hologram with a variable elongation parameter makes it possible to change the in-focus distance of the reconstructed image. In this way, the proposed algorithm can be verified at different distances by dispensing the recording of different holograms. Experimental results are shown with the aim of demonstrating the usefulness of the proposed method, and a comparative analysis has been performed with respect to other existing algorithms developed for DH.
在数字全息术（DH）中，搜索和恢复正确的重建距离可能是一个繁琐且主观的过程。在这里，我们报告了一种用于自动估计聚焦图像并恢复散斑全息图正确重建距离的算法。我们已经在确定拉伸数字全息图的重建距离方面测试了该方法。通过使用可变拉伸参数拉伸全息图，可以改变重建图像的焦点距离。通过这种方式，可以通过省去记录不同全息图的方式，在不同距离处验证所提出的算法。实验结果表明了所提出方法的有用性，并且已经针对其他用于 DH 的现有算法进行了比较分析。
