Principal component analysis in the spectral analysis of the dynamic laser speckle patternsK. M. Ribeiro, R. A. Braga, G. W. Horgan, D. D. Ferreira and T. SáfadiJ. Eur. Opt. Soc.-Rapid Publ., 9 (2014) 14009DOI: https://doi.org/10.2971/jeos.2014.14009