Binocular Stereovision

The human visual system is a natural stereovision system. The human eyes (each equivalent to a camera) observe the same scene from two viewpoints, and the information obtained is combined in the human brain to give a 3D objective world. In computer vision, by collecting one set of two (or more) images from different viewing angles, the parallax (disparity) between corresponding pixels in different images can be obtained by means of the principle of triangulation. That is, the parallax is the difference between the positions of a 3D space point projected onto these 2D images. The depth information and the reconstructions of the 3D scene can be further obtained according to the parallax.