OCT-based quantitative analysis of craquelure morphology in an oil painting

A thorough three-dimensional quantitative analysis of an artwork crack can yield valuable and in-depth information regarding the preservation, restoration, and authenticity of the artwork. In this study, high-resolution three-dimensional optical coherence tomography(OCT) images were obtained for each type of crack, and cross-sectional images of the cracks were extracted. The width and depth distributions were measured over the entire length of the cracks, and the z-axis slice cross-sectional areas were measured over the entire height of the cracks. The analysis revealed that straight cracks exhibited the most significant variations in width and depth. In contrast, vertical cracks exhibited minimal variability in terms of width and depth. Furthermore, radial cracks exhibited greater variability in depth than in width. The z-axis cross-sectional area increased from the center of the crack to both ends or from one side of the central horizontal axis reference of the crack. The utilization of these precise artwork measurement data can facilitate the optimization of preservation and restoration efforts, thereby providing a scientific foundation for the identification of counterfeits. This approach can prevent damage to the aesthetic, economic, and historical value of the artwork and contribute to its appropriate preservation.