Accuracy and Density of Optical Flows by Gradient-Based Methods with Local Optimisation.

摘要

The gradient-based method was evaluated as to its accuracy and space resolution motion detection. The velocity was determined as the maximum of the optical flow components in the direction of the brightness gradient from the video image sequences in a miniature world. The standard deviations of measured velocity were 0.4 picture elements (p.e.) at a speed of 1.8 p.e., and 0.8 p.e. at a speed of 7.2 p.e. with four channels of space frequency. The method required about a thousand picture-element data to detect one velocity.