Observation of the Back Gate with Camera Images Using Optical Flows andTime Correlation of Local Windows in the Images

It is important to watch over the people passing through the back gate in the images of the observation camera. Especially, they want to detect the passing people through the gate other than harmless ones crossing by the gate. To accomplish this, we have estimated the changes of time correlation values of segmented small windows in the image sequence of the camera looking at the gate and analyzed directions of optical flows on the changing windows. So that, we detect something moves toward or along the gate. This paper describes how to detect changes and their moving directions in the image of the gate and shows some experimental results.