can any one help me by proving code for image comparison and for time delay in matlab, as we are doing project on image processing based traffic light control

 

If they are the same size and resolution, go across, pixel by pixel, NAND each byte from image 2 from image 1 to create image 3.

You end up with everything the same between the two images, there will be some artifacts, especially if you are using JPG compressed images. Though mostly a dark image with what the changed parts showing.

If the camera is at a fixed view, you could constrain the search for change to a certain area of the image.

A GREAT course on image processing is the Imagemagick suite, it is sort of like a command line photoshop to use in shell scripts in *nix, but is also ported to windows. It is open source, and you can look for very efficient C code for compare images, with various output options.