Figure 2. Original spectrum and first derivative spectrum of 48 fish oil samples (a) original spectrum (b) first derivative spectrum

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