The analysis and calculation were also made by the correlation method of Grey system theory.

并运用灰色系统理论的关联度分析方法进行了分析和计算。

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It can cut down calculation on correlation-matching and enhance veracity of object-recognition.

优点是既减少了相关匹配的计算量，又提高了目标识别的准确度。

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If the dimension of pattern space is too big, it would result in the difficulty on calculation, and confusing with the indetermination because of high correlation of many variables.

如果模式空间的维数较大，那么不仅会造成计算上的困难，而且由于不少变量之间往往相关程度高，会造成混淆和不确定性，所以需进行特征选择。

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