Fast autofocusing in digital holography using the magnitude differential

Lyu Meng; Yuan Caojin; Li Dayan; Situ Guohai

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Fast autofocusing in digital holography using the magnitude differential

机译：使用幅度差分快速自动聚焦数字全息内容

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Typical methods of automatic estimation of focusing in digital holography calculate every single reconstructed frame to get a critical function and then ascertain the focal plane by finding the extreme value of that function. Here, we propose a digital holographic autofocusing method that computes the focused distance using the first longitudinal difference of the magnitude of the reconstructed image. We demonstrate the proposed method with both numerical simulations and optical experiments of amplitude-contrast and phase-contrast objects. The results suggest that the proposed method performs better than other existing methods, in terms of applicability and computation efficiency, with potential applications in industrial and biomedical inspections where automatic focus tracking is necessary. (C) 2017 Optical Society of America

机译：数字全息术中聚焦自动估计的典型方法计算每个重建帧以获得临界功能，然后通过找到该功能的极值来确定焦平面。这里，我们提出了一种数字全息自动聚焦方法，其使用重建图像的幅度的第一纵向差来计算聚焦距离。我们展示了具有幅度对比度和相位对比物体的数值模拟和光学实验的所提出的方法。结果表明，该方法在适用性和计算效率方面比其他现有方法更好地执行，具有工业和生物医学检查的潜在应用，其中需要自动焦点跟踪。（c）2017年光学学会

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《Applied optics》 |2017年第13期|共6页
作者
Lyu Meng; Yuan Caojin; Li Dayan; Situ Guohai;
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作者单位

Chinese Acad Sci Shanghai Inst Opt &

Fine Mech Shanghai 201800 Peoples R China;

Nanjing Normal Univ Dept Phys Nanjing 210023 Jiangsu Peoples R China;

Chinese Acad Sci Shanghai Inst Opt &

Fine Mech Shanghai 201800 Peoples R China;

Chinese Acad Sci Shanghai Inst Opt &

Fine Mech Shanghai 201800 Peoples R China;

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正文语种 eng
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Fast autofocusing in digital holography using the magnitude differential

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