三维重建中曲面反照率值的估计与应用

Estimation and application of surface albedo in 3D reconstruction

从单幅图像获得物体的表面高度是计算机视觉中的一个重要研究领域,其中一种重要的方法就是从明暗恢复形状(ShapefromShading,简称SFS)。在SFS的各种不同算法中都需要曲面的反照率值,反照率值的估算是否准确直接影响了三维重建的效果。针对反照率值的估算,已经产生了很多有效的算法。文中讨论了三种反照率值的估计算法及其优缺点,并将局部反照率估计算法引入到三维重建中,解决了由全局反照率值重建的弊端。

Extracting surface depth from a shaded image is one of the classic problems in computer vision. One of the most important method is shape from Shading （SFS）.Surface albedo is necessary in many different SFS algorithm. It is closely linked to the effect of 3D reconstruction. Many effective algorithm of albedo estimation has been proposed. This paper discusses three algorithm of albedo estimation and there efficiencies. By using local estimation algorithm instead of whole estimation algorithm, the effect of 3D retortstruction is improved.