By analyzing the relativity and independence of signal and noise, the signal-to-noise ratios and system disturbance ability can further be improved by certain times' signal-digital-averaging.

经过分析信号和噪声的相关性和无关性，提出可以经过一定次数的对信号的数字平均，以进一步提高信号的信噪比和系统的抗干扰能力。

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A digital image filtering algorithm of local cluster averaging is described.

本文提出了一种局部集群平均数字图象滤波算法。

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Grid digital terrain is produced with getting reference point by subarea and weighted averaging method, and is visualized.

进一步采取分区域选点法，用加权平均法生成了网格数字地形，实现了地形的可视化。

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