Image Process

Plz if any one can help me in this matter.
I want to extract traffic parameter form image such, count No. of Car on Image. Lenght of Car Queue on image.

This is an urgent thing . Apperciating your kindlly response to this issue.

Omar

explain more

What is the traffic parameter??
may be its in a special types of images !!

Traffic Parameter mean, If I have an image for street the image has many cars, what i want is to count the Number of car in the image. that’s all.

Note that there is an example on Maltlab regarding that the Title is "Tracking Car using Background Estimation"
but the example is in Simulkin and block there is no code shown how to doing using code.