Abstract
This paper describes roles of speckle in measurements of shape and deformation of rough surfaces by digital holography and speckle correlation. Speckles are distinct natural markings of rough surfaces appearing in 3-d space because they show displacement and decorrelation due to surface deformation and/or changes of illumination. Digital recording and processing for coherent metrology started from speckle interferometry and speckle photography and fully bloomed by digital holography. These techniques offer perfectly noncontacting and quick measurement applicable for real objects.
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