Table 6 Experimental recognition operator result of mineral green, granularity (large) for different cases in group 2

From: Digital restoration of mural paintings from late Tang tomb M1373 in Xi’an based on hyperspectral analysis and image interaction processing

Normalization operator value (The smaller the better)

Mineral green, Granularity (large)

Azurite, Granularity (large)

Mineral green, Granularity (middle)

Azurite, Granularity (middle)

Mineral green, Granularity (small)

Azurite, Granularity (small)

SAM operator

0.000

0.6146

0.4599

1

0.3469

0.8022

SID operator

0.000

0.4229

0.2572

1

0.1729

0.6828

Mixed operator

0.000

0.1823

0.06882

1

0.03192

0.4693

  1. Bold indicates the optimal value in the current comparison group.