■Kazuki YAMAHARA,Kouichi KONNO,Fumito CHIBA, Maasa SATOH,  A Method of Detecting Adjacent Pieces of Restoring Refitted Flakes with Extracting Peeling Surfaces,   (2011).

The refitted flakes of the stone tools are one of the important material in archeology to investigate the life of people of paleolithic and Jomon Period. Various information such as the stone tool producer production intention, action, technologies, and ranges of life can be obtained by connecting flakes exhausted by the process of generating the stone tool, and reproducing the generation process of the stone tool. Then, many researchers try to find the adjacent stone tool that belongs to the same core. Since restoration of refitted flakes is manual work, it is hard and time-consuming. In addition, the restoration might damage the stone tools, which places a large burden on the restoration staffs. This paper proposes the method to detect the contiguity of stone tools by using the polygons created from the measured point clouds on the faces of the stone tool flakes for the restoration of refitted flakes. In our method, finding the adjacent stone tools is based on the posture of the peeling faces. Therefore, to extract peeling faces, edges between peeling faces are detected with the curvature. Because the peeling faces are smooth shape and edges between peeling faces are sharp shape. With our method, the contiguity between stone tools can be detected.