Application of Permutation Entropy in Feature Extraction for Near-Infrared Spectroscopy Noninvasive Blood Glucose Detection

Figure 6

PE, FD, and MI of segmented spectral data: (a) 50 mg/dL, (b) 100 mg/dL, (c) 150 mg/dL, and (d) 200 mg/dL.

(a)

(b)

(c)

(d)