Technologies that are developed are all
based on optics, used as a means of measurement.
The optical principles are, holography, speckle interferometry, structured light, multi-spectral imaging, shearography, stereo vision, tracking, etc ....
Most of these principles are based on
digital imaging.
A fundamental step in each of these processes is the image processing, which can incorporate several aspects of calibration, which allows at the end to get real
optical metrology tools.