关键词: 轮廓网格, 约减, 特征提取, 贝塞尔曲线簇, 建模

Abstract: A problem about identifying the closed processing paths on the free-form surface needs to be solved. First, a large number of point cloud data obtained through the scanner was reduced by the method of establishing three-dimensional grid. And then, contour grid was extracted. One feature point with the three-dimensional coordinate and the normal vector was calculated in each contour grid. These feature points were ordered, and then processing paths were described by the Bezier curves cluster calculated by feature points. At last, the closed processing paths were indicated by a seal smooth curve that had solved the problem of identifying the close processing paths.

Key words: contour grid, reduction, feature extraction, Bezier curves cluster, mathematical modeling