关键词: 纹理合成, 树皮纹理, 纹理渐变, 边缘融合

Abstract: Bark textures realization is a major problem in the field of visualization for virtual trees.It is a tough job to simulate abundant details on the bark’s surface and the progressively-variant transition effects across different locations on the trunk.A method for synthesizing realistic bark textures is presented.The method adopts the idea of patch-based sampling strategy，and can generate a whole piece of trunk according to some bark texture samples.The generated bark textures can efficiently avoid the seam problem caused by common texture mapping approach.Furthermore，by controlling the synthesis probability，the method can successfully simulate the progressively-variant transition effects between the old parts of bark to the tender parts.In addition，this paper also simulates the scar effects on the bark by using scar samples and utilizing edge melting method.Experimental results show that the realistic bark textures synthesized by this method can exhibit the features of tree growth change so as to satisfy the need of realistic tree representation.

Key words: texture synthesis, bark texture, progressively-variant textures, edge melting