+
Security Surveillance
System
Jeanette Miranda
Continuing work by Peter Schiffman and Zac Kelton
May 17, 2013
ENGN256: Computer Vision
+
Indoor Security Surveillance
System


One static webcam

Background

Motion detection and location
Pan, tilt, zoom network camera

Correlation of motion in static webcam feed to motion in ptz feed

Track most important motion
+
Background, Motion detection and
location

Both largely the same as mid project presentation

Background



Ability to capture clean background image for testing
Grayscale background image
Motion detection and location


Varying number of objects to track dependent on threshold at
pixel level
Absolute difference between current frame and current
background
 Apply threshold
 Morphological operators to clean up mask
+
Camera Calibration

SURF Feature Detector with FLANN (Fast Library for
Approximate Nearest Neighbors) based matcher

Center of motion for ip camera from center of feature points
that match to within bounding box of motion on static camera

Experimented with 2D homography – unsuccessful results

Limit on how far center of motion for ip camera can move per
frame

For ip camera to move, need to be minimum distance away
from center (prevent shutter)
+
Network Camera
From spec sheet available at: http://www.123securityproducts.com/pz8111w.html

LAN – NETGEAR Fast Ethernet Switch (FS105) between laptop
and network camera

Web API for pan, tilt, zoom, mjpg video stream, etc
+
Screenshots
Static Camera (white rectangle
bounding box of motion)
IP Camera (white circle
center of motion)
+
Screenshots
Static Camera (white rectangle
bounding box of motion)
IP Camera (white circle
center of motion)
+
Code

Multithreaded implementation in C++



Motion detection and background generation can do more
intensive computation, and then skip frames to compensate
Libraries (opensource):

Opencv: http://code.opencv.org/projects/opencv/wiki

CVBlob: https://code.google.com/p/cvblob/

cURLpp: https://code.google.com/p/curlpp/
Available on GitHub (currently only tested on OSx)

https://github.com/jcmiranda/SurveillanceSystem
+
Future Directions

More robust motion detection for static camera

More exploration of different approaches to camera
calibration

Exploiting knowledge of when the camera moves

3d calibration rig – opencv support for chessboard?

Fast motion location on ip camera feed without background to
supplement matching?

Continuity of motion path

Tuning delays between moves and minimum offset necessary to
cause a move