Table 1. The comparision of the recognition rate (%)

	Method	C	E	M	N	Avg.
k1	Norm2	92.2	90.5	83.9	83.9	88.5
	LDA	90.8	89.9	90.2	88.7	89.9
k2	Norm2	89.2	89.9	83.5	84.1	86.7
	LDA	90.8	90.8	90.2	90.5	90.6