Abstract：Mineral pigments is the color rendering basic of ancient murals, the visible spectrum of mineral pigment reflects its chemical composition and physical properties. Different mineral pigments have different spectral shapes because of different absorb properties for visible spectrum, even the same mineral pigment often shows different spectral amplitudes as it is grinded to different levels of particle size. According to the spectral features of mineral pigments above, a non-destructive pigment identification method of ancient murals based on visible spectrum is proposed. The normalized spectral curve, first derivative and second derivative extracted from spectral reflectance are combined to construct the identification feature space and the matching error (ME) calculated by multiply the normalized euclidean distance and angle between spectral feature from wall paintings and reference database is adopted as the criterion for pigment chemical property identification. The function relationship between mean spectral reflectance and mean particle size of the mineral pigments with particle size levels is constructed for pigment particle size identification. The proposed method is validated by the ancient murals in Mogao Grottoes based on the constructed pigment reference database and in-situ non-destructive spectral measurement method. The techniques of using pigments in murals and the differences of pigment used in different dynasties are tentatively analyzed and explained based on the identification results of malachite and lapis lazuli. The authors believe that the proposed method will provide effective support for in-depth studies on ancient murals.
梁金星, 万晓霞. 基于可见光谱的古代壁画颜料无损鉴别方法[J]. 光谱学与光谱分析, 2017, 37(08): 2519-2526.
LIANG Jin-xing, WAN Xiao-xia. Non-Destructive Pigment Identification Method of Ancient Murals Based on Visible Spectrum. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2017, 37(08): 2519-2526.
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