defrise_ellipses¶

odl.phantom.geometric.defrise_ellipses(ndim, nellipses=8, alternating=False)[source]¶

Ellipses for the standard Defrise phantom in 2 or 3 dimensions.

Parameters:

ndim{2, 3}: Dimension of the space for the ellipses/ellipsoids.
nellipsesint, optional: Number of ellipses. If more ellipses are used, each ellipse becomes thinner.
alternatingbool, optional: True if the ellipses should have alternating densities (+1, -1), otherwise all ellipses have value +1.