Constraints on length and angle

@article{Kanatani1988ConstraintsOL,
  title={Constraints on length and angle},
  author={Kenichi Kanatani},
  journal={Computer Vision, Graphics, and Image Processing},
  year={1988},
  volume={41},
  pages={28-42}
}
Given a perspective projection of line segments on the image plane, the constraints on their 3D positions and orientations are derived on the assumption that their true lengths or the true angles they make are known. The approach here is first to transform images of line segments to the center of the image plane as if the camera were rotated to aim at them. The 3D information extracted in this canonical position is then transformed back to the original configuration. Examples are given, by… CONTINUE READING