Application of hyperspectral imaging technology to digitally protect murals in the Qutan temple

Heritage Science

Research

Ning Cao¹  Shuqiang Lyu²  Mingyi Du²  Miaole Hou²  Zhenhua Gao³  Wanfu Wang⁴ 

[1] Beijing Institute of Surveying and Mapping, 100038, Beijing, China;School of Geomatics and Urban Spatial Informatics, Beijing University of Civil Engineering and Architecture, 100044, Beijing, China;Beijing Key Laboratory for Architectural Heritage Fine Reconstruction & Health Monitoring, 100044, Beijing, China;School of Geomatics and Urban Spatial Informatics, Beijing University of Civil Engineering and Architecture, 100044, Beijing, China;Shanxi Provincial Institute of Archaeology, 030000, Taiyuan, China;The Conservation Institute of Dunhuang Academy, 736200, Dunhuang, Gansu, China;National Research Center for Conservation of Ancient Wall Paintings and Earthen Sites, Dunhuang Academy, 736200, Dunhuang, Gansu, China;

关键词: Hyperspectral imaging;    Mural;    Pigment analysis;    Line extraction;    Information enhancement;    Hidden information extraction;    Virtual restoration;   

DOI  :  10.1186/s40494-022-00847-7

 received in 2022-04-13, accepted in 2022-12-19,  发布年份 2022

来源: Springer

【 摘 要 】

Hyperspectral imaging technology is a research hotspot in the field of cultural heritage protection. It can be used to quickly and noninvasively obtain detailed spectral information from the surfaces of cultural relics of different categories. We can intuitively analyse pigment compositions, line characteristics, painting skills and patterns using spectral information. Hyperspectral imaging has high scientific significance and application value for the protection, restoration and research of ancient murals and other cultural relics. In this study, a mural from Daheitian hall in the Qutan temple, Qinghai Province, China, was used as a sample. The hyperspectral data were acquired and analysed for several purposes. Pigment spectral matching and abundance inversion were carried out to obtain the pigment distribution. These data were enhanced by continuum removal and histogram stretching to obtain hidden information. The dark channel prior, Criminisi and Retinex methods were used to virtually restore the image of the mural. The results indicated that by using hyperspectral imaging data, the constructed pure pigment spectrum library and suitable approaches, the types and distributions of mural pigments can be quantitatively analysed, and the lines in murals can be extracted. Hyperspectral images are helpful for identifying information hidden by pigments or surface materials. Mural images can be enhanced, and hidden information can be highlighted using enhancement methods, such as continuum removal and histogram linear stretching. In addition, hyperspectral imaging data have unique advantages in the restoration of mural images, and the combination of defogging methods and image inpainting algorithms can realize the virtual restoration of mural images. In brief, hyperspectral imaging technology was found to have a highly favourable effect on pigment analysis, line extraction, information enhancement, hidden information extraction and the virtual restoration of ancient murals.

【 授权许可】

CC BY   
© The Author(s) 2023

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