Unusual Event Detection in Wide-Angle Video (Based on Moving Object Trajectories)
1 Assignment
0 Petitions
Accused Products
Abstract
Object images captured by a wide-angle camera are distorted due to the optical effects of the wide-angle lens. The disclosed innovations allow an automatic analysis on the corrected image distinguishing normal movement from an unusual event movement. The analysis is based on Markov Modeling on moving object trajectories and motion angles.
26 Citations
52 Claims
-
1-10. -10. (canceled)
-
11. A method of monitoring moving objects in a wide-angle video, comprising the steps of:
-
determining moving object trajectories; converting the moving object trajectories to a trajectory in a perspectively corrected image domain; and interpreting the object trajectories for detecting unusual behavior using state transition probability models of non-hidden Markov models; wherein the said moving object trajectories in corrected image domain are interpreted using Markov Models with states defined according to motion vector angles of moving objects for unusual event detection; wherein the Markov Models are trained with motion vectors in Cartesian coordinates and polar coordinates computed in corrected image domain. - View Dependent Claims (15, 19, 21)
-
-
12-14. -14. (canceled)
-
16-18. -18. (canceled)
-
20. (canceled)
-
22-40. -40. (canceled)
-
42. A system for detecting unusual events in a wide-angle video, comprising:
-
an electronic camera that emulates PTZ function capturing wide-angle digital video images; and an image data processor that calculates and converts moving pixel blob trajectories in a non-rectilinear image domain and analyzes the blob trajectories as unusual behavior using state transition probability models applied to a data object histogram; wherein the state transition probability models are trained using prior trajectory data corresponding to regular and unusual motion trajectories of moving objects. - View Dependent Claims (43, 44, 45, 46)
-
-
52-57. -57. (canceled)
Specification