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利用小波变换对５２个烟草样品的近红外漫反射光谱进行滤波处理，并用ＰＬＳ法来计算烟草样品的总氮含量，结果表明小波变换滤波后，预测集的相对标准偏差由原来的９．２％降为７．４％，此结果也优于傅里叶交换和五点三次平滑。
The near-infrared diffuse reflectance spectra of 52 tobacco samples were filtered by wavelet transform, and the total nitrogen content of tobacco samples was calculated by PLS method. The results showed that the relative standard deviation of the predicted set from the original 9.2% Down to 7.4%, the result is also better than the Fourier exchange and smoothing five times.