1. A method for tracking a follicular unit, the method comprising: identifying at least one marker in a first image, the first image including a follicular unit; computing a signature of the follicular unit in the first image; identifying the at least one marker in a second image; computing a motion vector corresponding to a change in position of the at least one marker from the first image to the second image; and using the motion vector and the signature of the follicular unit in the first image to label the follicular unit in the second image.