它基于接收信号的二阶统计量，并用长时积分以弥补信噪比低的问题。
The proposed algorithm is based on second order moment, and the problem of low SNR is compensated by long time integral.
分析此散斑图像的二阶统计特性，导出了强度变化的相关函数和表面粗糙度参数之间的关系。
The relation between the correlation function of intensity variation and surface roughness parameter is derived through analyzing the second-order statistical properties of the speckle image.
人脸识别中，人脸图像的信息不仅存在于像素间的二阶统计特性中，更存在于像素间的高阶统计特性中。
In the face recognition, important information not only exists in the picture element in two-order statistical property but also contains in the high-order statistical property.
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