Experiment shows that acutance function method is better than mean square error function method. The error factors are analyzed and corresponding improvement approaches are put forward.

实验结果表明在该系统中锐度函数法作判据的效果要优于均方差函数法，最后分析误差因素并提出修正途径。

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And then, fractal characterizations and dimension calculations were conducted in two kinds of profile curves with the methods of the structure function and the mean square root.

然后用结构函数和均方根两种方法对理论和实际的轮廓曲线进行了分形表征和分维计算。

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Studying the properties of square residues, and giving a mean value formula of the divisor function for square residue sequences.

研究了平方剩余数的性质，给出了平方剩余数对于除数函数的均值公式。

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