Ibm svs alerting performance for loitering and crowd formation
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IBM SVS Alerting Performance for Loitering and Crowd Formation. Overview. Several short video clips were provided demonstrating the following behavior Loitering Crowds forming Stalking Rowdiness & Fighting Crowds running away (rapidly disbursing) Bag snatching

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Ibm svs alerting performance for loitering and crowd formation

IBM SVS Alerting Performance for Loitering and Crowd Formation


Overview
Overview

  • Several short video clips were provided demonstrating the following behavior

    • Loitering

    • Crowds forming

    • Stalking

    • Rowdiness & Fighting

    • Crowds running away (rapidly disbursing)

    • Bag snatching

  • SVS currently only has the ability to detect Loitering and Crowds gathering

  • Seven videos demonstrating these behavior were ingested into SVS to demonstrate our ability to generate an alert on these behaviors

  • The following slides show the results


Notes
Notes

  • The Loitering alert will trigger on any individual who remains in the field of view for more than a set period of time.

    • For this test times of 20 and 60 seconds were used, determined by the length of the loitering in the video clip

  • Two Crowd Forming alerts were tested

    • Trigger when the total activity in a region exceeds a threshold (MA)

    • Trigger when the number of moving objects in a region exceeds a threshold (OI)

    • On these short clips, both versions performed well

    • In production the alerts would be tested over a longer time period and the version performing better with respect to hit rate and false positive rate would be used.


Disk 1
Disk 1

  • crowding.mp4

  • loitering 1.mp4

    • The loitering alert fired on both the target individual (left) and the officer who appeared to be directing the video (right)

  • loitering 2.mp4


Disk 2 2
Disk 2.2

  • slow gathering.mp4


Disk 3 1
Disk 3.1

  • slow crowding.mp4


Disk 3 2
Disk 3.2

  • crowding 1.mp4


Disk 4 1
Disk 4.1

  • slow gathering.mp4