ibm svs alerting performance for loitering and crowd formation
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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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Presentation Transcript
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
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