Extraction of a 3D graph structure of wormholes in a wooden statue of Buddha by X-ray CT image analysis

摘要

The high historical and preciously wooden statues of Buddha, have received serious damages by cracking, corrosion, wormholes, etc., because of the quality of the materials of woods. For the restoration of such damaged statues, the advance inspections of their interior conditions without destroying them are demanded. In this paper, we meet such a demand by taking the X-ray CT images and by applying some techniques of image analysis for extraction of image features which are useful for the restoration. Especially, we focus on wormhole regions which are the most serious damages. We first present a method of the region segmentation and then consider extraction of a 3D graph structure of wormhole regions. Since each node of the graph possesses the geometric information such as a location, and a diameter of each wormhole, we show that the graph structures are useful for visualizing wormholes.