| 摘要: |
| 提出了一种新的基于图象的绘制技术.与线性视域插值方法不同，此方法能准确地模拟出漫游过程中的透视变换效果.为了加速视域插值算法，采用二叉剖分方法来优化源图象的分解，从而大大减少了分解后块图象的数目.对生成的中间画面上的黑洞，此方法分两个步骤来填充.算法首先根据深度信息来决定是否需要扩展与黑洞相邻的块图象的边界，然后采用多向视域插值方法插值这些扩展后的块图象来生成中间画面.理论和实验结果表明，此方法比传统方法在准确性和效率上均有显著提高. |
| 关键词: 视域插值,环境映照,透视变换,二叉剖分,虚拟现实. |
| DOI： |
| 分类号: |
| 基金项目:本文研究得到国家自然科学基金和霍英东青年教师基金资助. |
|
| Nonlinear View Interpolation |
|
BAO Hu-jun,CHEN Li,WANG Zhang-ye,PENG Qun-sheng
|
| Abstract: |
| A new image-based rendering technique is presented in this paper. Unlike the linear interpolation scheme, this method can exactly simulate the perspective viewing transformation during the walkthrough. To accelerate the view interpolation, the algorithm employs a binary subdivision scheme to optimize the decomposition of the source image so that the number of the resultant blocks is greatly reduced. Holes on the intermediate image are filled by two steps, namely enlarging the transferred blocks at the side adjacent to holes and retrieving the local image within the holes from the destination images by multiple-directional interpolation. Experimental results demonstrated the algorithm is much more accurate and efficient than the traditional one. |
| Key words: view interpolation, environment map, perspective transformation, binary subdivision, virtual reality. |
