Analyte | No. | Chemometric method | Color model | Data preprocessing | R2 | Q2 | RMSEC | RMSEP | Rx | RMSEPeyes |
---|---|---|---|---|---|---|---|---|---|---|
Mn2+ | 1 | PLS | RGB | S | 0.9981 | 0.9872 | 1.50 | 3.42 | 2.28 | 5.35 |
2 | MLR, PLS | RGB | F | 0.9879 | 0.9870 | 3.74 | 3.45 | 0.92 | ||
3 | PLS | RGB | SD | 0.9993 | 0.9845 | 0.92 | 3.76 | 4.08 | ||
4 | MLR | CMYK | None | 0.9893 | 0.9829 | 3.53 | 3.95 | 1.12 | ||
5 | PLS | CMYK | F | 0.9935 | 0.9796 | 2.75 | 4.31 | 1.57 | ||
Fe2+/Fe3+ | 1 | ULR | CMYK | K | 0.8729 | 0.9632 | 12.16 | 5.80 | 0.48 | 8.62 |
2 | ULR | CMYK | AK | 0.8765 | 0.9571 | 11.98 | 6.26 | 0.52 | ||
3 | ULR | RGB | B | 0.8794 | 0.9555 | 11.84 | 6.37 | 0.54 | ||
4 | ULR | CIELAB | A | 0.8857 | 0.9450 | 11.53 | 7.09 | 0.62 | ||
5 | ULR | RGB | R | 0.8794 | 0.9555 | 11.84 | 6.37 | 0.54 | ||
Cu2+ | 1 | ULR | RGB | B | 0.9359 | 0.8208 | 24.87 | 35.83 | 1.44 | 48.18 |
2 | ULR | RGB | AR | 0.9638 | 0.8200 | 18.70 | 35.90 | 1.92 | ||
3 | ULR | RGB | AB | 0.9317 | 0.8196 | 25.67 | 35.95 | 1.40 | ||
4 | ULR | RGB | R | 0.9555 | 0.8176 | 20.71 | 36.15 | 1.75 | ||
5 | ULR | CMYK | K | 0.9499 | 0.8132 | 21.98 | 36.58 | 1.66 | ||
NO3- | 1 | MLR | CMYK | F | 0.9688 | 0.9736 | 29.44 | 23.55 | 0.80 | 33.03 |
2 | PLS | CMYK | D | 0.9596 | 0.9628 | 33.50 | 27.96 | 0.83 | ||
3 | MLR | CMYK | D | 0.9696 | 0.9624 | 29.04 | 28.12 | 0.97 | ||
4 | PLS | RGB | I | 0.9774 | 0.9619 | 25.06 | 28.28 | 1.13 | ||
5 | PLS | CMYK | A | 0.9652 | 0.9614 | 31.09 | 28.46 | 0.92 | ||
PO43- | 1 | ULR | RGB | G value | 0.8864 | 0.9442 | 12.02 | 6.38 | 0.53 | 9.74 |
2 | PLS | HSV | S | 0.8790 | 0.9439 | 12.41 | 6.40 | 0.52 | ||
3 | ULR | CMYK | AK | 0.8870 | 0.9397 | 11.99 | 6.64 | 0.55 | ||
4 | ULR | CMYK | K | 0.8813 | 0.9381 | 12.29 | 6.72 | 0.55 | ||
5 | ULR | RGB | B | 0.8777 | 0.9380 | 12.47 | 6.73 | 0.54 | ||
SO42- | 1 | PLS | RGB | I | 0.9696 | 0.9705 | 90.10 | 78.75 | 0.87 | 198.89 |
2 | PLS | CIELAB | None | 0.9705 | 0.9667 | 88.74 | 83.64 | 0.94 | ||
3 | PLS | CIELAB | SO | 0.9568 | 0.9598 | 107.35 | 91.86 | 0.86 | ||
4 | PLS | RGB | N | 0.9408 | 0.9583 | 125.66 | 93.55 | 0.74 | ||
5 | PLS | RGB | None | 0.9439 | 0.9577 | 122.33 | 94.25 | 0.77 | ||
pH | 1 | PLS | RGB | N | 0.9996 | 0.9955 | 0.08 | 0.22 | 2.91 | 0.74 |
2 | PLS | RGB | SD | 1.0000 | 0.9946 | 0.03 | 0.25 | 9.47 | ||
3 | PLS | CMYK | N | 1.0000 | 0.9920 | 0.02 | 0.30 | 14.20 | ||
4 | PLS | CIELAB | None | 0.9984 | 0.9912 | 0.16 | 0.31 | 1.96 | ||
5 | PLS | RGB | None | 0.9999 | 0.9916 | 0.03 | 0.31 | 10.79 | ||
Total hardness | 1 | PLS | CMYK | F | 1.0000 | 0.9905 | 0.18 | 10.22 | 57.28 | 48.74 |
2 | PLS | CMYK | None | 0.9998 | 0.9882 | 2.21 | 11.37 | 5.15 | ||
3 | PLS | RGB | F | 0.9999 | 0.9880 | 1.58 | 11.48 | 7.25 | ||
4 | PLS | RGB | A | 0.9998 | 0.9817 | 2.12 | 14.15 | 6.67 | ||
5 | PLS | CMYK | A | 0.9997 | 0.9803 | 2.27 | 14.68 | 6.47 |