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Laser speckle imaging with an active noise reduction scheme

Völker, Andreas C. ; Zakharov, Pavel ; Weber, B. ; Buck, F. ; Scheffold, Frank

In: Optic Express, 2005, vol. 13, no. 24, p. 9782-9787

We present an optical scheme to actively suppress statistical noise in Laser Speckle Imaging (LSI). This is achieved by illuminating the object surface through a diffuser. Slow rotation of the diffuser leads to statistically independent surface speckles on time scales that can be selected by the rotation speed. Active suppression of statistical noise is achieved by accumulating data over...