计算出自相关系数和互相关系数；
The self - correlation coefficient and cross-correlation coefficient are also calculated.
倘若两个信号都是随机的，则互相关系数为零。
If the two signals are random, the cross-correlation is zero.
在景象匹配过程中，选用归一化互相关系数作为相似性度量。
During the process, the normalized cross correlation function is used as the similarity measure.
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