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DOI:
Journal of Software:2002.13(9):1796-1803

基于图像的实时漫游
张严辞,刘学慧,吴恩华
(中国科学院,软件研究所,计算机科学重点实验室,北京,100080;中国科学院,软件研究所,计算机科学重点实验室,北京,100080;澳门大学,科技学院,澳门)
Image-Based Real Time Walkthrough
ZHANG Yan-ci,LIU Xue-hui,WU En-hua
()
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Received:February 26, 2002    Revised:July 08, 2002
> 中文摘要: 提出了一个点和多边形模型混合的场景表达方式,从而实现了对复杂场景的视点不受限制的实时漫游.它从多幅带深度的参考图像出发,在预处理阶段区别对待场景中平面物体和曲面物体在参考图像中的对应像素.对于在参考图像所占区域较大的空间平面,用传统的多边形模型方式对其进行表达,试图恢复出其平面方程,然后通过采样密度比较和重采样过程,将该空间平面在所有参考图像中的出现合并成一个均匀采样的纹理图像;而对于空间曲面或在参考图像中所占面积较小的平面,使用点的形式对其进行表达,通过采样密度的比较去掉冗余的点,将保留下来的点按其空间位置进行聚类.同时,对于场景中那些不被所有参考图像所拍摄到而在漫游过程中可能形成空洞的部分,提出一个空洞预填补技术,在预处理阶段即对这类空洞进行填补,从而大大减少了漫游阶段出现空洞的几率.在漫游阶段则使用纹理映射和点Warping的方式进行绘制,以充分利用图形硬件的加速功能.
Abstract:A hybrid representation of environment models is proposed by combining points and polygons through which a real time walkthrough of a complex environment can be achieved. Starting from multiple depth reference images, the pixels of images are classified into two categories, corresponding to the planar and non-planar surfaces in 3D space. For the pixels corresponding to the planar surfaces, the plane coefficients are reconstructed and all their appearances in the reference images are merged to form uniform-sampled texture images by a comparison of sampling rate and resampling.For the pixels coresponding to the non-planar surfaces,their point representation is kept and no 3D models are reconstructed,the redundant pixels are removed by sampling rate comparison.The remained pixels are organized by OBB-tree according to their space coordinates.At the same time,the holes that are unable to be captured by all the reference images are pre-filled in the preprocessing phase so that the probability of hole appearance in walkthrough is greatly reduced.Under this hybrid representation,texture mapping and point warping are employed to render the novel views,to take full advantages of acceleration utility of graphics hardware.
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基金项目:国家自然科学基金资助项目(69873044);澳门大学基金资助项目(RG009/99-00S/WEH/FST) 国家自然科学基金资助项目(69873044);澳门大学基金资助项目(RG009/99-00S/WEH/FST)
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张严辞,刘学慧,吴恩华.基于图像的实时漫游.软件学报,2002,13(9):1796-1803

ZHANG Yan-ci,LIU Xue-hui,WU En-hua.Image-Based Real Time Walkthrough.Journal of Software,2002,13(9):1796-1803