create_Rayleigh_3D¶
- pyspeckle.pyspeckle.create_Rayleigh_3D(M, pix_per_speckle, alpha=1, beta=1, shape='ellipsoid')[source]¶
Generate an M x M x M unpolarized speckle irradiance pattern.
The speckle pattern will have a Rayleigh distribution and results from the incoherent sum of two speckle patterns.
The resolution is specified by the parameter pix_per_speckle and refers to the smallest speckle size. Thus pix_per_speckle=2 means sampling is at the Nyquist limit and pix_per_speckle=4 will have four pixels across the smallest speckle.
Non-circular speckle is supported using alpha. This is defined as the ratio of horizontal speckle size to vertical speckle size. alpha=1 is circular and alpha=2 will have speckles that are twice as tall as they are wide.
- Parameters
M – dimension of desired square speckle image
pix_per_speckle – number of pixels per smallest speckle.
alpha – ratio of x to y speckle size
beta – ratio of x to z speckle size
shape – ‘cube’, ‘shell’, or ‘ellipsoid’
- Returns
M x M X M speckle image