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。

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.

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然后，通过分形维数计算车辆的纹理特征，排除非车辆区域。

Second, the no-vehicle regions are filtered by texture feature of AOI based on DBC.

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利用分形学方法，计算图像的分维数，然后比较其分形特征。

Using fractal method, the fractal dimensions of these images are calculated to compare their fractal characteristics.

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