Vehicle detection on separate lanes

Hi all, my code can divide the lane and obtains the number of the vehicles in each lane However, it seems to me it is not the best solution since it run slower with more lanes. my method is to use binary mask to mask the video frame image for the lane. Since i want to do 3 lane, there are 3 masked image and each of them undergo optical flow. I want to obtain the number of vehicle from each of the lane separately. Is there any other better way?

Answer 1

[Image Analyst]

I already answered this in http://www.mathworks.com/matlabcentral/answers/122604#comment_204019