关键词: 立方体全景, 图像信息熵, 纹理再现, 同层次多级细节

Abstract: Texture rendering is the key to the scene reality in urban visualization, and it limits the development of urban visualization, as excessive quantities of texture data are needed, which means network traffic and power consumption on mobile terminal. This paper proposes a multilevel of details among same layer texture techniques used in    cubic texture rendering, named LOD-in-IBR. Because the information selection strategy of the human visual system is different when facing vary areas, the texture data with lower resolution are used to reappear low concerned area, so as to reduce the texture data and the resource consumption of the mobile terminal. The scene area is distinguished by information entropy of image texture, the multi-resolution is used to reappear different areas in order to achieve the multilevel of details among the same layer. This paper puts forward iterated bi-cubic interpolation algorithm to eliminate the block effect of which image scaling rate is less than 0.5. Using the proposed method, the texture data needed are reduced by 30% and the time of rendering panorama is reduced by 30% with no visual perception change when texture rendering.

Key words: cubic panorama, image information entropy, texture rendering, multilevel of details among same layer