In recent years, three-dimensional technology is capable to simplify the reassembly process of the fractured objects. The reassembly process of stone tools can be easily done by the refitted flake matching process. The refitted flake matching process is required for highly accurate segmented flakes. This work aims to extract highly accurate flake surfaces and to match the extracted flake surfaces. In addition, this paper studies the evaluation of the matching accuracy of the extracted flakes and comparison to other methods. This paper also presents an algorithm of flake surface recognition based on feature lines of stone tools. The implementation of this work can recognize flake surfaces according to the scale drawing of the stone tool with high accuracy.
The unreconstructed historic sites are hard to attract human interests or function as sightseeing spots. As a means of virtual reconstruction and appreciation of historical sites, the location-based Augmented Reality was used to develop applications for smartphones. Main development comprises 3D model display using position information from GPS and virtual space update according to user's movement. Since this application is assumed to be used for sightseeing purposes, additional functions are required to be implemented for making it more convenient.
The main purpose of computer games is to immerse a user in a virtual environment. The perception of immersion experience has been used to develop virtual reality applications for game-based learning, healthcare, rehabilitation, etc. In traditional games, the user immersion is performed through the sense of visuals and sounds with interactions through 2D input devices like the mouse and keyboards. Haptic technology can simulate tactile and kinesthetic sensations in virtual environments. The real-time interaction and feedback are very important for development of rehabilitation applications. The main goal of our research is to enable real time simulation of force feedback for rehabilitation and learning games. This paper presents a framework for developing the virtual puzzle-box game for rehabilitation and education based on haptic display. The proposed framework introduces a collision handling method to compute feedback force and provide realistic feedback through the haptic device.
This paper proposes a flake surface segmentation method using ridge lines extracted from point clouds. First, ridge lines are extracted from a point set of a stone tool. Next, neighboring points of a ridge line are extracted by calculating the Euclidean distance from the ridge line. An area surrounded by the neighboring points of the ridge line is selected. Then, the area is expanded from the selected region to the ridge line to segment a flake surface.