Laser speckle contrast imaging

Laser speckle contrast imaging (LSCI), also called laser speckle imaging (LSI), is an imaging modality based on the analysis of the blurring effect of the speckle pattern. The operation of LSCI is having a wide-field illumination of a rough surface through a coherent light source.

Source: Wikipedia — Laser speckle contrast imaging (CC BY-SA 4.0)