Digital Image Correlation
Digital Image Correlation and Tracking (DIC/DDIT) is an optical method that employs tracking & image registration techniques for accurate 2D and 3D measurements of changes in images. This is often used to measure deformation (engineering), displacement, strain, and optical flow, but it is widely applied in many areas of science and engineering. One very common application is for measuring the motion of an optical mouse.
Read more about Digital Image Correlation: Overview, Differential Digital Image Tracking (DDIT), Resolution of DIC/DDIT
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