1. A method of tracking an object of interest, the method comprising: acquiring a first image and a second image representing different viewpoints of the object of interest; processing the first image into a first image data set and the second image into a second image data set; processing the first image data set and the second image data set to generate a background data set associated with a background; generating a first difference map by determining differences between the first image data set and the background data set and a second difference map by determining differences between the second image data set and the background data set; detecting a first relative position of the object of interest in the first difference map and a second relative position of the object of interest in the second difference map; and producing an absolute position of the object of interest from the first and second relative positions of the object of interest.