Abstract: This study presents a method for estimating the motion of camera, by using only slope of line segments which is feature robust to noises in a system of computer vision in rotation movement. Our method is based only on the formalism of the slope of the segment by using the definition of the projection of points and the relation which exists between the slopes of the segment in various images and this without any knowledge about geometrical models of cameras or of there matching primitives. Experiment showed feasibility as well as robustness of the algorithm.