track using coordinates of image [closed]

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I am working on a project to track an object with a laser pointer on a 2 axis sentry. For now I am just using color filtering and a cvLine with cvMoment to find the center and and track it that way. My problem is the coordinates given are within the detected object, not the whole screen itself. I am using a servo for each axis to move depending on the direction the object move. I am not sure if i am using the wrong google search terms or if it is more complicated than it seems. Thank you for your help!

An example would be excellent but any key word terms to search would be great as well!