fourierDescr iptor.rar, 抽取目标图形的轮廓及其fourier Descr iptor算子, 然后对此fourier descr iptor进行标准化(normalized), 标准化以后的算子满足orientation，scale 和translation invariant。 再将此算子与某标准图形的fourier 算子进行比较， 若各项差的平方小雨某范围，则断定与此标准图像类似。

-fourierDescr iptor.rar extract the target graphic outline and its fourier Descr iptor operator, then the fourier descr iptor is normalized. After the normalization the operator satisfies the orientation, scale and translation invariant. This fourier operator is compared to the operator of a known graphic. If the difference is small enough, then the both are similar.