How can I count street cars using Matlab and a Webcam?

I am a new to matlab. I am doing a project that will require me to count the number of cars entering a street and exiting on the other side. Using the information, I will require to compute the number of cars on that particular street as in:

Density = Entering cars - Exiting cars.

Therefore I need to have two Regions of Interest in the video in form of a trigger line(line that counts when triggered by a car) as shown in this video. The example is not done in matlab though but am sure its possible. Does anyone know how I can go about this, I do not even know how I could insert such a line in a video. Thanks in advance

Answer 1

[Image Analyst]

What video? You didn't give a link or attach a video.

MATLAB can do this with the Computer Vision System Toolbox, as shown here: http://www.mathworks.com/help/vision/gs/object-detection-and-tracking.html#btt5qyu

[Elias Gikonyo]

Sorry Image Analyst, I made a mistake placing the link on my question above. This is the link . I want to have the first line count cars as ENTRANCE and the second line across the video as EXIT, then compute street density as: Density of cars = ENTRANCE - EXIT. Please help me out, the demo you have is great by the way, but not in the format I wish. Thank you in advance

[Mohd Nasrul Mubin]

anyone has any idea how to draw the line of entering and exit?