Shape from apparent contours for bent pipes with constant diameter under perspective projection
Xiaoqi Cheng, Junhua Sun, Fuqiang Zhou, Yanxia Xie
Abstract
In perspective projection images, apparent contours are important bases for recovering the three-dimensional (3D) shapes of constant diameter pipes (CDP). In order to complete the 3D reconstruction of CDP under perspective projection, this article first analyzes the single-view perspective projection model of CDP in detail. On this basis, coupled point pairs searching and projected axis extraction methods based on two facing apparent contours are proposed. After that, stereo vision technology is adopted to realize the 3D reconstruction of axis and the measurement of radius. Finally, the experiments with both synthetic and real data show that the proposed method has higher CDP reconstruction accuracy compared with the conventional method processed under orthogonal projection.