## 4 NIR-Hyperspectral Imaging Spectroscopy for Yam and Cassava Food Quality
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**S\_N** & **Method** & **Trait** & **Product** & **Software** & **Equipment** & **References** \\ \hline
16 & Vis/NIR-HSI & Soluble solid content & Sliced sweet potato & PLSR, SVR, MLR -ENVI 4.6 and MATLAB 2011a- & Hyperspectral imager—GaiField-V10E & [99] \\ \hline
17 & HSI & Moisture and gastric acid distribution & Steamed and fried sweet potato & PLS -Prediktera Evitorse 2.7.2- & VIS-InGaAs hyperspectral camera and a Headwall spectrograph & [100] \\ \hline
18 & NIR-HIS & Moisture migration during dehydration & Fresh potato & PLSR -Matlab 7.12- & CCD camera (Xeva 992) and ImSpector N17E & [82] \\ \hline
19 & NIR-HSI & Moisture content & Potato and sweet potato & LWPLSR -Matlab R2017b- & CCD camera (Xeva 992) and ImSpector N17E & [29] \\ \hline
20 & NIR-HSI & Variety & P1 SR & and ImSpector N17E & \\  & identification and cooking loss & Sweet potato & -Unscrambler 10.1 software and PLStoolbox & LUMOS FT-MIR (Bruker Optics) in & [34] \\  & MIR-HSI & determination & & v8.6 in Matlab & (Bruker Optics) in & \\  & & & & R2017b software- & & \\ \hline
21 & MIR & Total sugar, polysaccharides, and flavonoids & Chinese yam & PLS & Thermo Nicolet 380 & \\  & & & & Fourier transform (FT-IR) & [101] \\ \hline
22 & HSI & Optimal cooking time & Potato tubers & PLS-DA -MATLAB 7.5- & CCD camera (KP-F120) with ImSpector V10 & [102] \\ \hline
23 & MIR & Acrylamide content & Potato chips & PLSR -Pirouette 4.0 software- & Fourier-Transform IR spectrometer and Agilent FTIR spectrometer & [103] \\ \hline
24 & MIR & Nutritional traits & Freeze-dried potato flour & PLSR -Pirouette 4.0 software- & Agilent FT-IR spectrometer & [104] \\ \hline
25 & Vis-NIR/SWIR-HSI & Black spot detection & Potato tubers & PLS-DA -MATLAB R2014a- & CCD camera (TXG14) with ImSpector V10 & [105] \\  & HSI & & & -MATLAB R2014a- & Spectrograph & \\ \hline
26 & Vis/NIR-HSI & Moisture content & Potato slices & PLS -MATLAB 2013b- & [PERSON] lens (Xenoplan 1.9/35) with ImSpector V10 & [25] \\  & & and chromaticity & Potato & -MATLAB 2013b- & & \\  & & & & & \\ \hline
27 & Vis/NIR-HSI & Glycosalkaloids and chlorophyll & Potato & PLSR -R software- & TechSpec 25 mm with ImSpector V10 & [27] \\ \hline
28 & HSI & Anthocyanin content & Purple-fleshed sweet potato & PLSR, MLR, and LS-SVM & Inno-Spec CCD camera (VRmC-9) with an & \\  & & content & sweet potato & -ENVI 5.1, LS-SVM & Inno-Spec image & [106] \\  & & slices & v1.5 toolbox, and MATLAB R2013a- & spectrograph (Golden & \\  & & & & & \\ \hline
29 & Vis/NIR-HSI & Postharvest monitoring during hot air drying & Organic potato & PLS -MATLAB R2015b, & [PERSON] lens (Xenoplan 1.9/35) & \\  & & during hot air drying & Organic potato & PLS\_Toolbox with ImSpector V10E & [107] \\  & & drying & & & \\  & & drying & & & \\ \hline
30 & Vis/NIR-HSI & Sugar content & Potato slices & -MATLAB 7.5.0.342 & CCD camera (C480)—Hamamatsu Photonics & [33] \\  & & & & software- & Photonics & \\ \hline \hline \end{tabular}
\end{table} 
Table 1: _Cont._There remains a scarcity of information on applying this technique for the quality traits assessment of cassava and yam tubers. Table 2 summarizes the few works reported on detection of adulteration in cassava flour and tapioca starch. NIR-HSI should also be explored for important quality parameters such as color, starch content, amylose, protein and texture of cassava and yam products which are key traits that drives their acceptability by consumers.