Figures & data
Figure 1. Fruit and arils of pomegranate (cv. “ASHRAF”) cultivar at different maturity stages. Immature stage: A: 88 DAFB; B: half-ripe stage: 109 DAFB; C: fairly half-ripe stage 124: DAFB; and D: full-ripe stage: 143 DAFB.
Figure 2. A: Set-up of Vis/NIR equipment; B: fruit presentation for NIR spectroscopy.
Table 1. Statistical details of the samples used in calibration (Cal) and validation (Val) of different Models.
Figure 3. NIR raw absorbance spectra of pomegranate fruit at different maturity stages. Stage 1: 88 DAFB; Stage 2: 109 DAFB; Stage 3: 124 DAFB; and Stage 4: 143 DAFB.
Table 2. Performance of different spectral preprocessing techniques on pomegranate maturity classification by principal component analysis (PCA).
Table 3. The results of calibration and prediction of PLS models with preprocessing techniques for TSS.
Table 4. The results of calibration and prediction of PLS models with preprocessing techniques for pH.
Figure 4. Scatter plot of measured values versus NIRS predicted values for the validation set after application of SNV, median filtering and applying first derivative preprocessing: A: TSS; B: pH; and C: TA.
