Prediction Model of the Key Components for Lodging Resistance in Rapeseed Stalk Using Near-Infrared Reflectance Spectroscopy (NIRS)

Table 3

The result of carbon spectrum using eleven spectral preprocessing methods.

Number	Pretreatment method	Wave number (cm^−1)	Principal component number	R	RMSECV (%)
1	No spectral pretreatment	7501.7–4246.5	9	0.973	0.240
2	First-order derivative	7501.7–4246.5	10	0.942	0.356
3	Straight line subtraction	7501.7–4597.5	10	0.928	0.394
4	Constant offset elimination	7501.7–4597.5	10	0.923	0.407
5	First-order derivative + straight line subtraction	7501.7–4246.5	9	0.922	0.411
6	First-order derivative + MSC	7501.7–4246.5	8	0.916	0.424
7	First-order derivative + vector normalization	7501.7–4246.5	8	0.915	0.426
8	Second-order derivative	7501.7–4246.5	9	0.911	0.436
9	Multiplication scattering correction	7501.7–6097.8	6	0.908	0.443
		5453.7–4246.5
10	Min-max normalization	6799.8–6097.8	8	0.897	0.469
		5453.7–4246.5
11	Vector normalization	7501.7–4246.5	9	0.896	0.469