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. 2013 Oct 7;4(11):2347–2361. doi: 10.1364/BOE.4.002347

Fig. 3.

Fig. 3

First and second order statistics of the speckle intensity pattern recorded using the static part of the flow phantom and an exposure time T = 1 ms. (a) Intensity probability density function (PDF) of static speckle pattern (green triangles) and plot of gamma-PDF with M = 2.2 (black line) (b) Power spectral density (PSD) of the static speckle intensity pattern showing sampling above the Nyquist frequency. FWHMPSD ≈2.5 pixel−1. (c) Normalized autocovariance of static speckle intensity pattern, full width ≈5 pixels, equivalent area ≈6 pixels, FWHMautocov. ≈2.2 pixel.