The seminal work of Yamaguchi [1] described the use of
digital recording of speckle patterns in order to measure
displacement and deformation. Since then, the approach
has been adapted for use in various fields such as bioengineering [2], materials characterization [3], microelectronics
[4], and civil engineering [5]. Some notable developments
with the technique include photorefractive crystal recording [6] and successful rate analysis [7]. In a typical recording and measurement procedure, CCD cameras are used in
conjunction with image processors and dedicated software
on computers. Such setups generally require investment of
time and cost.