Real-time recursive filter to identify weather events using traffic CCTV video

摘要

A program is implemented on a processor for executing the following steps: receiving images of a scene comprising successive frames from a camera, each frame including an array of pixels; filtering intensities of the array of pixels in a respective frame by using a Bessel Filter to compute a constant value for the respective frame; and summing a predetermined number of respective frames from the camera to determine rapid motion in the scene. The filter includes a Bessel filter, which is an n-pole recursive digital filter, where n is a positive integer.

主权项

1. A processor for executing the following steps:
receiving images of a scene comprising successive frames from a camera, each frame including an array of pixels; filtering intensities of the array of pixels in a respective frame by using a Bessel Filter to compute a constant value for the respective frame, and summing a predetermined number of respective frames from the camera to determine rapid motion in the scene, wherein the rapid motion in the scene is a weather-related event, including motion of a rain fall, a hail storm, a snow storm, or a tornado, which is provided as notification to a remote station, and the filtering is implemented using the following recursive relationship:Ii,j,k′=Γ0⁢Ii,j,k-Γ1⁢Ii,j,k-1+Γ2⁢Ii,j,k-2-Γ3⁢Ii,j,k-3+Γ4⁢Ii,j,k-4-Γ5⁢Ii,j,k-5+Γ6⁢Ii,j,k-6-Γ7⁢Ii,j,k-7+Γ8⁢Ii,j,k-1′-Γ9⁢Ii,j,k-2′+Γ10⁢Ii,j,k-3′-Γ11⁢Ii,j,k-4′+Γ12⁢Ii,j,k-5′-Γ13⁢Ii,j,k-6′+Γ14⁢Ii,j,k-7′-Γ15⁢Ii,j,k-8′ where:Ii,j,k are pixel intensities of a kth frame captured by the camera,I′i,j,k are filtered pixel intensities of the kth frame,the kth frame is defined as a present frame,(k-1) to (k-8) are successive previous frames, andΓ0-Γ15 are constants.