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The crude protein(CP) content is an important index to evaluate the quality of fish feed. Near infrared spectroscopy (NIRS) is often applied when a rapid quantization of CP content in feed is required. 240 samples of 4 fish feed brands (Takara sakana-ii, Shangpin, WEIYE and Clever fish) were collected for calibration models by partial least squares (PLS) and artificial neural network (ANN). Firstly,...
A nondestructive optical method for determining the geographic origins of rice was investigated. Average absorption spectra of rice for three different geographic origins were analyzed. Direct orthogonal signal correction (DOSC), standard normal variate transformation (SNV) combined with detrending, multiply scatter calibration (MSC) and Savitzky-Golay second-order derivative transformation (S.Golay...
A new instrument for the variety discrimination of fragrant mushrooms was designed and fabricated. First, the principle of using visible and near infrared (Vis/NIR) spectroscopy for variety discrimination of fragrant mushrooms was introduced. Then, the method of using error back propagation artificial neural network (BP-ANN) in the Vis/NIR spectral data analysis was elaborated. Before applying BP-ANN...
An improved method was proposed in order to accelerate the convergence speed and reduce the training time of back propagation (BP) neural network. The principal component analysis (PCA) was used as the pre-processing to select principal components from the input variables. The regression and correlation analysis were used as the post-processing to analyze the result and test the precision of training...
Pattern recognition problems specifically for spectral data were developed. As an application, classification of four tea varieties based on near infrared spectra was taken by using the method. Factor analysis (FA) and artificial neural networks (ANN) were used for pattern recognition in this research. FA is a very effective data mining way; it was applied to enhance species features and reduce data...
Near infrared reflectance spectroscopy (NIRS) appears to be a rapid and convenient non-destructive technique that can measure the quality and compositional attributes of many substances. This paper assesses the ability of NIR reflectance spectroscopy to estimate the pH values of bayberry juice. Spectra were collected from 76 juice samples and data was expressed as absorbance, the logarithm of the...
A new method for the discrimination of peach varieties by Vis/near infrared reflectance spectroscopy (NIRS) (325-1075nm) was developed. A relationship has been established between the reflectance spectra and peach varieties. The set was consisted of a total of 90 samples of peaches. First, the data was analyzed by principal component analysis (PCA). PCA compressed thousands of spectral data into a...
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