数字全息作为一种相干成像方法，散斑噪声严重影响其成像质量。针对这一问题，提出了一种基于微位移的数字全息散斑噪声抑制方法。在全息记录过程中，通过连续微小平移物体，记录多帧数字全息图。对多帧全息图分别进行数字再现。在再现计算中，利用像差校正算法和图像配准算法，正确校正由于物体微位移造成的复振幅分布差异，以获得多帧具有相同物光场分布，但散斑噪声不相关的再现像复振幅。通过平均叠加多帧再现物光复振幅，有效抑制散斑噪声对再现振幅像和相位像的影响。理论分析与实验结果均表明，该方法是有效和可行的。

As a coherent digital holographic imaging method, the speckles noise degrades the image quality. To solve this problem, a method to reduce speckle noise is proposed for digital holography. A series of digital holograms is obtained by shifting object slightly. Each hologram is reconstructed individually, while the differences between these retrieved complex amplitudes due to the object shifting are corrected with phase compensation and image registration algorithms. So all reconstructed complex amplitudes of object have same distribution, but uncorrelated coherent noise patterns. The speckle noise is well suppressed by averaging these reconstructed images. The theory and experimental results prove that the method is effective and feasible.