基于可见光谱的古代壁画颜料无损鉴别方法

发布时间：2018-03-05 12:52

本文选题：可见光谱　切入点：古代壁画　出处：《光谱学与光谱分析》2017年08期 　论文类型：期刊论文

【摘要】：矿物颜料是古代壁画显色的物质基础,其可见光谱反映自身物质和物理属性。不同颜料对可见光吸收特性的差异导致光谱曲线形状不同,同一种颜料因粒径等级差异引起光谱曲线幅值的规律性变化。依据矿物颜料上述特性,提出一种基于可见光谱的古代壁画颜料无损鉴别方法,通过光谱归一化方法实现不同粒径等级的同一颜料光谱曲线叠合,去除颜料粒径等级对光谱曲线幅值变化的影响,然后提取表征光谱曲线在各波段增减性和凹凸性的一阶与二阶导数特征,与光谱曲线组合得到颜料物质属性鉴别的光谱组合特征空间,以光谱角和欧式距离为基础构建评价指标,计算待鉴别颜料与数据库参考样本在光谱特征空间中的匹配误差(ME),实现颜料物质属性的鉴别。通过构建矿物颜料平均粒径大小和光谱反射率均值之间关系函数,实现颜料平均粒径大小的鉴别。基于构建的古代壁画常用颜料光谱数据库,以莫高窟壁画为对象,通过非接触式原位无损测量方法测量获得壁画颜料的可见光谱数据,对本文方法进行了验证,并以石绿和青金石颜料的鉴别结果为例,对古代壁画颜料使用技法、不同朝代颜料使用的差异性及原因进行了探讨。该方法将为更加全面深入研究和保护古代壁画提供有效的理论与方法支撑。
[Abstract]:Mineral pigment is the material basis of ancient mural color, the visible spectrum reflect their own physical and physical attributes. Different pigment absorption characteristics to visible light leads to spectral curves of different shapes, with a pigment regularity of spectral curve of amplitude variation caused by the size of the level difference. According to the characteristics of mineral pigments, presents a nondestructive identification method of ancient mural pigments based on visible spectrum, through the spectral normalization method to achieve the same pigment spectra curves of different size grade laminated, removal of pigment grade change on spectral curve of amplitude influence, and then extract the characterization of spectral curve in each band changes and concavity of the first and two derivative features get the spectral feature space, combination of material properties and pigment differential spectral curve combination with spectral angle and Euclidean distance for the construction of the evaluation index, calculate the identification of pigments The matching error in spectral feature space and database reference sample (ME), identify the material properties of the pigment. Through the construction of the relationship between the average particle size of mineral pigments and spectral reflectance mean function, the average particle size of the pigment identification. The ancient mural pigments commonly used spectral database based on the construction of Mogao Grottoes murals for the object the visible spectrum data, through non-contact in situ nondestructive measurement for mural pigment, to verify the method, and the identification results of malachite green and Lapis Lazuli pigment as an example, using the techniques of ancient mural pigments, differences and reasons of different dynasties pigment were discussed. This method will provide more comprehensive research and protection of ancient murals provide theory and method support effectively.

【作者单位】：武汉大学印刷与包装系;
【基金】：国家自然科学基金面上项目(61275172,61575147) 国家重点基础研究发展计划项目(2012CB725302)资助
【分类号】：K879.41;O433.4

【相似文献】