中文摘要：

为便于城市地下管线的铺设与维护，提出一种基于增强现实的地下管线真实感可视化方法，将原本不可见的虚拟地下管线真实地呈现在视频画面中．首先将屏幕空间分割为对地下管线具有不同遮挡语义的4个区域；然后借鉴工程图学中的剖视图方法，采用沿地下管线走向的坑道式剖切和地表面的竖直剖切方法来展示被遮挡的地下管线；进而根据画面的遮挡语义，运用视频中地表遮挡物和地下管线的重要视觉特征，揭示地下管线与地表物体之间的正确遮挡关系；最后利用渐变融合对地下隐藏信息与真实场景视频进行合成．实验结果表明，该方法不依赖于三维场景的精确几何重建，可在GPU上实时实现．

英文摘要：

To facilitate the layout and maintenance of urban underground pipelines, a new approach of photorealistic visualization for underground pipelines integrated into the video of real scene is presented. We exploit section cutaways perpendicular to the ground plane and tunnel cutaways along pipelines to reveal the underground pipelines. To exhibit the correct spatial relationship of the underground pipelines with the objects overground, we segment the screen space into four regions with different depth semantics. We then retain the important visual features of both underground pipelines and the overground objects within the particular region for depth cuing and utilize gradual mask for composition. Our approach does not rely on the geometric reconstruction of the 3D environment, and its GPU implementation achieves a real-time performance.