Fig. 5.

STOC manipulation controls the degree of spatial coherence by varying the number of phase masks, $M.$ (a) Intensity images with two rectangles showing ROIs used to calculate scattering coherency matrix $G$ (b,c). For $M<32$, the intensity image contains speckle noise. The corresponding matrices $G$ are not diagonal, which indicate the high degree of spatial coherence. For $M\ge 32$ this degree is reduced (diagonal $G$), so the speckle contrast in the corresponding intensity images is diminished.