3-D motion estimation from motion field

摘要

Several experiments suggest that the first stage of motion perception is the measurement of visual motion. The result of this stage is called the motion field, which assigns a velocity vector to each point in the image plane. The second stage involves interpreting the motion field in terms of objects and motion in the three-dimensional world. Recovering 3-D motion of the object from the motion field has been difficult owing to the nonlinear system of equations involved, and the sensitivity of the system to noise. The need for the stability of the system is essential as only the optical flow field can be recovered from a sequence of images, which is at best a crude approximation to the motion field.