Determining Constant Optical Flow
نویسنده
چکیده
The original optical flow algorithm [1] dealt with a flow field that could vary from place to place in the image, as would typically occur when a camera is moved through a three-dimensional environment—or if objects moved in front of a fixed camera. A related, but simpler problem, is that of recovering the motion of an image, all parts of which move with the same velocity (section 4.3 in [2]). The solution of this problem enables “optical mice,” as well as motion compensation in hand-held video cameras—critical to their operation. We provide here background onmoving images, amethod for the estimation of image velocity using least squares applied to brightness derivatives, and an analysis of the sensitivity of the estimated image velocity to noise in brightness measurement.
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