中文摘要：

针对基于网格投影的自由曲面三维重建方法中,特征点集中分布于投影网格线条之上,而投影网格线条未能覆盖的部分即投影网格线条间的自由曲面区域无特征点,导致重建精度较低的问题,提出一种基于自适应窗口的改进Census变换立体匹配方法,对投影网格线条间的自由曲面进行三维重建;将特征匹配算法与区域匹配算法相结合,以图像中目标物体上的投影网格指导Census变换;利用可变视差范围计算Hamming距离作为匹配代价;通过筛选获得精度较高的匹配点对。实验结果表明,该算法应用于双目视觉图像三维重建,可有效提高投影网格线条间自由曲面的重建精度。

英文摘要：

The feature points obtained from free-form surface 3D reconstruction method which based on grid projection all distribute along the projected grid lines only,and there is none feature point on the surface among the projected grid lines,which lead to the low accuracy reconstruction. An improved Census transform stereo matching method based on adaptive window is presented to reconstruct the surface among the projected grid lines. The method incorporates feature-based method and region-based method. The grid lines projected on the experimental subject surface are utilized to guide Census transform,the Hamming distance computed by dynamic disparity is used as the matching cost,and the higher accuracy matching points are obtained after filtering.The proposed method is applied on the binary vision 3D reconstruction to validate the improved reconstruction accuracy of surface among the projected grid lines.