algorithms.registration.polyaffine

Module: algorithms.registration.polyaffine

Inheritance diagram for nipy.algorithms.registration.polyaffine:

Inheritance diagram of nipy.algorithms.registration.polyaffine

PolyAffine

class nipy.algorithms.registration.polyaffine.PolyAffine(centers, affines, sigma, glob_affine=None)

Bases: nipy.algorithms.registration.transform.Transform

__init__(centers, affines, sigma, glob_affine=None)

centers: N times 3 array

We are given a set of affine transforms T_i with centers x_i, all in homogeneous coordinates. The polyaffine transform is defined, up to a right composition with a global affine, as:

T(x) = sum_i w_i(x) T_i x

where w_i(x) = g(x-x_i)/Z(x) are normalized Gaussian weights that sum up to one for every x.

affine(i)
affines()
apply(xyz)

xyz is an (N, 3) array

compose(other)

Compose this transform onto another

Parameters
otherTransform

transform that we compose onto

Returns
composed_transformTransform

a transform implementing the composition of self on other

left_compose(other)
property param