关键词: 点云模型, 视觉凸壳, 层次深度图, 环境映射

Abstract: Based on the theory of visual hulls，this paper presents a method for point based modeling and rendering from real objects’ images.For point based modeling，a series of images is taken for the object from a set of viewpoints.Then，this paper uniformly point-samples the visual hull formed by these images.During the sampling，a regular-interval index table is used to organize the silhouette of each image，which increases the modeling efficiency.For point based rendering，a series of discrete reflectance properties of the points is obtained from the images under various directional lighting conditions.Then，realistic rendering is achieved with an improved algorithm to interpolate the reflectance properties.The experimental results show that the method has great efficiency，and provides high realistic rendering.

Key words: point based models, visual hull, layered depth image, environment mapping