An algorithm is described for the fringe analysis in laser speckle velocimetry. Based on the 2-D fast Fourier transform, the method relies on inherent features in the fringe pattern to remove efficiently the influence of the diffraction halo. A windowing operation is performed to enhance the reliability and reduce the influence of various noise contributions.
© 1990 Optical Society of America
Thomas Rösgen, Klaus Wozniak, and Günter Wozniak, "Image processing for laser speckle velocimetry using the 2-D fast Fourier transform," Appl. Opt. 29, 5298-5302 (1990)