Abstract
Abstract. Since the colour in painting cultural relics observed by our naked eyes or hyperspectral cameras is usually a mixture of several kinds of pigments, the mixed pigments analysis will be an important subject in the field of ancient painting conservation and restoration. This paper aims to find a more effective method to confirm the types of every pure pigment from mixture on the surface of paintings. Firstly, we adopted two kinds of blind source separation algorithms, which are independent component analysis and non-negative matrix factorization, to extract the pure pigment component from mixed spectrum respectively. Moreover, we matched the separated pure spectrum with the pigments spectra library built by our team to determine the pigment type. Furthermore, three kinds of data including simulation data, mixed pigments spectral data measured in laboratory, and the spectral data of an ancient painting were chosen to evaluate the performance of the different algorithms. And the accuracy was compared between the two algorithms. Finally, the experimental results show that non-negative matrix factorization method is more suitable for endmember extraction in the field of ancient painting conservation and restoration.
Highlights
IntroductionWith brilliantly colored and vivid images, has an outstanding value in scientific study and artwork appreciation
Painting cultural heritage, with brilliantly colored and vivid images, has an outstanding value in scientific study and artwork appreciation
We used three kinds of data including simulation data, mixed pigments spectral data measured in laboratory, and the spectral data of an ancient painting for mixed spectral separation
Summary
With brilliantly colored and vivid images, has an outstanding value in scientific study and artwork appreciation. In order to preserve these ancient artworks and show their cultural value perfectly, it’s need to restore and duplication colours frequently. The colours observed by our naked eyes or hyperspectral cameras are usually mixtures of several kinds of pigments due to the traditional Chinese painting skills and steps. With the limitation of the instrument, environment, or other reasons, most of them need to collect samples from ancient paintings, which is a secondary damage for cultural relics. Hyperspectral technique, with the advantages of no-touching and no-sampling, is a kind of non-invasive way that has been used in the conservation study of cultural relics for decades
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