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Guidance on controlling motors and image processing


I am building a new robot in which I'm using image processing. I have connected  a camera to laptop and doing image processing through Matlab.

Now, I want to controll motors through my laptop. How I can do this? Mean how I can connect motors to my laptop?
And next thing is that how I can interlink matlab and motor's controll code, so that motors run following the image processing.

Buried wire fence

    Hey all, well I am revisiting my lawnmower project, well not really concerned with mowing lawn but more of an outdoor autonomous robot for my backyard..

    Anyway I spent ALOT of time with circuits over the past winter and with no real success. So to cut rapidly to the chase what I am trying to design/figure out is a buried wire fence type solution that I can put in my back yard with 2 sensors (left/right) on the robot and when it gets close to the wire it can either avoid it or follow it home depending on programming..