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.

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将一维的表面肌电信号转换为二维的散点图，在这二维的平面空间中研究散点在一周360度的各个方向上的分布情况，提出了象限信息熵的概念。

Converte the one dimension time series into two dimension spot figure, then study the distribution of the spot around the 360 degree directions, compute the quadrant information entropy.

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证实了本系统设计的合理性和适用性，也对散斑相关测量表面粗糙度理论进行了较好的实验验证。

The rationality and the applicability of this system are proved experimentally. It also makes us to be sure of the theory of surface roughness measurement by laser speckle correlation.

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