Figure 6
From: OPTICS-based Unsupervised Method for Flaking Degree Evaluation on the Murals in Mogao Grottoes
Average spectral curves for different areas. a(1) Shows the representative areas of the same pigment under different degree of flaking, and b(1) shows the typical area of different pigment in normal region. a(2) and b(2) Show the original spectral curves for the selected areas in a(1) and b(1), respectively. a(3) and b(3) Show the spectral features after SAE extraction, a(4) and b(4) show the spectral features extracted by PCA.
