The invention belongs to the technical field of
image processing, and particularly relates to an abnormal action detection method and
system based on multi-scale
optical flow feature fusion, and the method comprises the following steps: S1, obtaining a real-time video
stream of a monitoring region, carrying out the graying
processing of a continuous frame image, constructing a
Gaussian pyramid comprising a fine scale layer and a coarse scale layer, and carrying out the gray
processing of the continuous frame image; the
optical flow module value of the fine scale layer and the
optical flow module value of the coarse scale layer are respectively calculated; and S2, constructing a micro-motion saliency difference model by using the optical flow module value of the fine-scale layer and the optical flow module value of the coarse-scale layer, and introducing logarithmic
gain by calculating the ratio relation of the two. The problem that the
false alarm rate of an outdoor scene is high is fundamentally solved, meanwhile, by introducing weighting of the direction chaos degree, the
system can accurately distinguish ordered operation and disordered trembling, and the blank in the field of weak abnormal sign monitoring is filled.