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Octree decomposition has been proven to be one of the most successful approaches for progressive geometry compression of 3D models. An octree is built up by recursively subdividing the bounding box of 3D models into a number of sub-cells. Each node of the octree has an 8-bit-binary code called occupancy code, indicating the non-emptiness of its children, given a pre-defined traversal order. Then the...
Traditional 2D line-drawing methods are mostly manual and hence quite laborious. A new 3D-model-assisted approach makes archaeological reports more accurate, efficient, and informative. The Web extra is a video that shows a new computer-assisted archaeological line drawing approach and its application in the investigation of the Longmen Grottoes, a cultural heritage site in China.
In this paper, based on manifold harmonics, we propose a novel framework for 3D shape similarity comparison and partial matching. First, we propose a novel symmetric mean-value representation to robustly construct high-quality manifold harmonic bases on nonuniform-sampling meshes. Then, based on the manifold harmonic bases constructed, a novel shape descriptor is presented to capture both of global...
Archaeological line drawing is an essential component of an archaeological report. In this paper, we propose a multi-scale approach to generating 3D line drawing on a triangular mesh model for archaeological illustration. The discrete multi-scale representation of a given model is first constructed based on random walks. Then, we propose a probabilistic method for local scale selection based on the...
We propose a multi-scale approach to detecting creases on noisy meshes. Given a noisy mesh as input, first we generate its discrete multi-scale representation based on an improved anisotropic diffusion method. Then, a method is presented for detecting salient vertices on a noisy mesh by exploiting curvatures estimated at different scales. Finally, creases are generated by connecting curvature extrema...
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