SNV 原理
SNV matlab 代码（原作者：Andrea Candolfi）
%# INPUT: x: (m x n) matrix with m spectra and n variables
%# OUTPUT: xsnv: (m x n) matrix containing snv transformed spectra
%# AUTHOR: Andrea Candolfi
%# Copyright(c) 1997 for ChemoAC
%# FABI, Vrije Universiteit Brussel
%# Laarbeeklaan 103 1090 Jette
%# TEST: Roy de Maesschalck, Menghui Zhang (2002)
function [xsnv]=snv(x)
a=xlsread('E:\近红外光谱文件\骏枣光谱阵.xls');
x=a';
[m,n]=size(x);
xsnv=(x-mean(x')'*ones(1,n))./(std(x')'*ones(1,n));
从网上下了很多SNV的资料，发现万变不离其宗，变来变去，基本的代码行还是如上所示。 | 
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