PAUL SCOVANNER Vision Surveillance. Surveillance Main tasks Locating people and objects in a scene ...
-
Upload
clementine-griffith -
Category
Documents
-
view
216 -
download
0
Transcript of PAUL SCOVANNER Vision Surveillance. Surveillance Main tasks Locating people and objects in a scene ...
PAUL SCOVANNER
Vision Surveillance
Surveillance
Main tasks Locating people and objects in a scene
Background Subtraction Object Detection
Track objects as they move Associate objects across frames
Beyond Tracking
Background Subtraction
Remove the background leaving areas where movement occurs
Frame Differencing: |framet – framet-1| > Threshold
Background Subtraction
Frame Differencing Fast Simple Error prone
(Illumination changes, Edges on large objects, Amplifies sensor noise)
Background Modeling |framet – Background| > Threshold Model the colors of each pixel as a Gaussian
(mean and standard deviation)
Background Subtraction
Mixture of Gaussians
Object Detectionaka “is that a car or a person?”
Aspect ratio
Object Detectors
Tracking
We can detect moving objects (If background subtraction works)
We can identify pedestrians and cars (If object detection works)
What’s left?
Tracking
Associate the detections in one frame with the next. Visual similarity Spatial location
Tracking
Multi-view Tracking
If 1 camera is good… 3 Must be better
Multi-view Tracking
Multi-view Tracking
Tracking From The Air
Tracking From The Air
Tracking From The Air
Tracking Prediction
Pedestrian Modeling Predict movements of
pedestrians
Anomaly Detection
Detect emergency events
Anomaly Detection
More Than Just Tracking
Crowd instability