Fig. 1. Flow chart of the FC-FastICA algorithm

Fig. 2. Flow chart of experimental system

Fig. 3. Experimental equipment of spectral reflectance acquisition system

Fig. 4. Spectral reflectance of pigment. (a) Primary reflectance of Chorme and Orpiment; (b) mixed reflectance of Chorme and Orpiment; (c) primary reflectance of Vermillion and Minium; (d) mixed reflectance of Vermillion and Minium; (e) primary reflectance of Vermillion and Azurite; (f) mixed reflectance of Vermillion and Azurite

Fig. 5. K/S value of the spectral reflectance of mixed pigment. (a) K/S value of the reflectance of mixed pigment with Chorme and Orpiment; (b) K/S value of the reflectance of mixed pigment with Vermillion and Minium; (c) K/S value of the reflectance of mixed pigment with Vermillion and Azurite

Fig. 6. Contrast chart of de-mixing results of Chorme and Orpiment mixed pigment. (a) Contrast chart of the K/S value of the de-mixing with Chorme; (b) contrast chart of the K/S value of the de-mixing with Orpiment

Fig. 7. Contrast chart of the de-mixing results of Vermillion and Minium mixed pigment. (a) Contrast chart of the K/S value of the de-mixing with Vermillion; (b) contrast chart of the K/S value of the de-mixing with Minium

Fig. 8. Contrast chart of de-mixing results of Vermillion and Azurite mixed pigment. (a) Contrast chart of the K/S value of the de-mixing with Vermillion; (b) contrast chart of the K/S value of the de-mixing with Azurite

Fig. 9. X_RMSE of de-mixing results of two algorithms

Table 1. Mixed pigment blocks

Table 2. Comparison of demixing accuracy between two algorithms