An economical wireless network monitored scheme for camera based intrusion detection at unattended sites

Unattended locations today require detection of any mal-intentional intrusion. Sensors of the Pyroelectric (PIR) or Microwave reflecting (MW) types are commonly available for detecting intrusion by a human. In this paper, a digital video camera is interfaced to a computer, say a simple laptop, which has provision for wireless USB based Ethernet connection. The program developed monitors a site in view of the camera and positively detects an intrusion by video frame based evaluation. A novel and sensitive algorithm for detection of motion from video frames is based on integrating the pixel intensities in successive finite difference method over a set of circular and way contour paths in the field of view of the camera. The proposed method is very fast compared to area pixel methods thus far available. The detected intrusion and its location within the scene are instantly messaged through the wireless cellular network adaptor, such as the “Tata Photon” using a simple “Compaq” laptop. The image itself follows the detection. Thus, this method is cheaper than the expensive sensing devices based on MW or PIR.