Home / Series / DEF CON / Aired Order / Season 32 / Episode 3

Securing CCTV Cameras Against Blind Spots

In recent years, CCTV footage has been integrated in systems to observe areas and detect traversing malicious actors (e.g., criminals, terrorists). However, this footage has "blind spots", areas where objects are detected with lower confidence due to their angle/distance from the camera. In this talk, we investigate a novel side effect of object detection in CCTV footage; location-based confidence weakness. We demonstrate that a pedestrian's position (distance, angle, height) in footage impacts an object detector's confidence. We analyze this phenomenon in four lighting conditions (lab, morning, afternoon, night) using five object detectors (YOLOv3, Faster R-CNN, SSD, DiffusionDet, RTMDet). We then demonstrate this in footage of pedestrian traffic from three locations (Broadway, Shibuya Crossing, Castro Street), showing they contain "blind spots" where pedestrians are detected with low confidence. This persists across various locations, object detectors, and times of day.

English
  • Originally Aired August 9, 2024
  • Runtime 45 minutes
  • Created August 25, 2024 by
    Subscriber-2473783
  • Modified August 25, 2024 by
    Subscriber-2473783