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Table 3
Polynomial coefficient of the ψV = ΣkakCIk relation for the five selected color indices.
| Relat. | Validity domain | a 0 | a 1 | a 2 | a 3 | Accuracy | ||
|
|
||||||||
| ψI(I − J) | [–0.4; 2.4] | 0.345406 | 0.463602 | 0.492598 | –0.010945 | 7.7% | ||
| ψI(I − K) | [–0.3; 3.4] | 0.354057 | 0.302133 | 0.072303 | 0.040738 | 6.0% | ||
| ψJ(J − H) | [–0.1; 0.5] | 0.343007 | 1.246796 | –2.741362 | 3.250034 | 9.6% | ||
| ψJ(J − K) | [–0.2; 0.65] | 0.342905 | 0.780303 | –0.855117 | 0.928470 | 8.2% | ||
| ψH(H − K) | [–0.1; 0.24] | 0.366284 | 2.159581 | 0.094470 | –9.658521 | 13.3% | ||
Notes. Each relation is defined only in a given validity color domain. See the text and Fig. 5 for the accuracy determination.
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