1. A method of measuring lengths at a greater resolution than a resolution offered by an image capturing system, said method comprising: capturing in said image capturing system, a first image of a first scale overlapping with a second scale, wherein said first scale has a first pitch and said second scale has a second pitch, wherein said first pitch is not equal to said second pitch; moving said first scale relative to said second scale by a distance; capturing in said image capturing system, a second image of said first scale overlapping with said second scale after said moving; and examining, using a digital processing system, said first image and said second image to determine a length of said distance.