Figure 3
From: Diffuse terahertz spectroscopy in turbid media using a wavelet-based bimodality spectral analysis
The bimodality-based MODWT MRA at \(\theta =0^{\circ }\), (a) the bimodality coefficient of the images formed from the extinction spectra and the MODWT MRA in the range 0.2–1.6 THz, (b-d) the receiver operating characteristic (ROC) curves obtained for identification of the region of each chemical using the component spatial pattern analysis based on the extinction spectra and the bimodality-based MODWT MRA, (e-g) the chemical maps (jet color map generated in MATLAB R2020b, https://www.mathworks.com/products/matlab) obtained using the component spatial pattern analysis based on the MODWT details for \(\alpha\)-lactose, PABA, and HDPE, respectively, (h) comparison of the F1-scores obtained for chemical mapping at each resonant frequency using the extinction spectra and the MODWT detail vectors.
