The seminal work of Yamaguchi [1] described the use of
igital recording of speckle patterns in order to measure
isplacement and deformation. Since then, the approach
as been adapted for use in various fields such as bioengi
eering [2], materials characterization [3], microelectronics
4], and civil engineering [5]. Some notable developments
with the technique include photorefractive crystal record
ng [6] and successful rate analysis [7]. In a typical record
ng and measurement procedure, CCD cameras are used in
onjunction with image processors and dedicated software
n computers. Such setups generally require investment of
ime and cost.
The first optical mouse was introduced in 1999 by Agi
ent Technologies to overcome the problems of wear and
irt accumulation. Due to the economics of large volume
roduction, the cost of an optical mouse is extremely
ow. The optical mouse was arguably first demonstrated
o be a viable scientific sensor by Ng [8]. Since then, it