基于近红外光谱主成分分析—马氏距离法的发汗与未发汗续断的快速鉴别(2)
A.发汗; B.不发汗; C.两者间的标准差(图4,5同)。图3 续断发汗和未发汗样品的原始光谱的光谱图
Fig.3 The crude spectrum of the crude and sweated Dipsaci Radix
图4 续断发汗和未发汗样品的一阶求导的光谱图
Fig.4 The first derivative spectrum of the crude and sweated Dipsaci Radix
2.2.4 主成分数选择 选取主成分(principal components, PCs)的个数取决于主成分的累计方差贡献
图5 续断发汗和未发汗样品的二阶求导的光谱图
Fig.5 The second derivative spectrum of the crude and sweated Dipsaci Radix
表1 不同光谱预处理方法对性能指数的影响
Table 1 The effects of different spectrum pretreated methods on the performance index
光谱预处理方法性能指数
MSC+spectrum+Ns94.457
MSC+spectrum+S-G94.466
MSC+1st D+Ns91.926
MSC+1st D+S-G91.986
MSC+1st D+Nd92.308
MSC+2nd D+Ns85.417
MSC+2nd D+S-G85.654
MSC+2nd D+Nd91.710
SNV+spectrum+Ns94.572
SNV+spectrum+S-G94.575
SNV+1st D+Ns91.776
SNV+1st D+S-G91.821
SNV+1st D+Nd92.097
SNV+2nd D+Ns85.270
SNV+2nd D+S-G85.504
SNV+2nd D+Nd91.626
率(cumulative) ......
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