We propose a numerical method for phase curvature compensation in digital holographic microscopy, in which the phase curvature is compensated for by subtracting a numerical phase mask from the distorted phase. The parameters of the phase mask are obtained based on phase gradient fitting and optimization, in which the initial mask parameters are obtained by fitting the phase gradient, and then more accurate mask parameters are determined using a spectrum energy search. The compensation can be executed in a hologram without extra devices or any prior knowledge of the setup and specimen. A computer simulation and experimental results demonstrated the feasibility of the proposed method.

中文翻译：

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基于相位梯度拟合和优化的数字全息显微镜中的相曲率补偿。

我们提出了一种数字全息显微术中用于相位曲率补偿的数值方法，其中通过从畸变的相位中减去数字相位掩模来补偿相位曲率。基于相位梯度拟合和优化获得相位掩模的参数，其中通过拟合相位梯度获得初始掩模参数，然后使用频谱能量搜索确定更准确的掩模参数。可以使用全息图进行补偿，而无需任何额外的设备或装置和样品的任何先验知识。计算机仿真和实验结果证明了该方法的可行性。