Figure 4. Comparison of several de-noising methods for the spectrum of No.6 sample (a): Smoothing spectrum with window size 9 points; (b):Wavelet transform soft-threshold method; (c): EMD method (d): EMD+ICA method

From

Near-infrared Spectrum Detection of Fish Oil DHA Content Based on Empirical Mode Decomposition and Independent Component Analysis

CAI Jian­hua

Journal of Food and Nutrition Research. 2014, 2(2), 62-68 doi:10.12691/jfnr-2-2-1