algorithms.registration.polyaffine¶
Module: algorithms.registration.polyaffine
¶
Inheritance diagram for nipy.algorithms.registration.polyaffine
:

PolyAffine
¶
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class
nipy.algorithms.registration.polyaffine.
PolyAffine
(centers, affines, sigma, glob_affine=None)¶ Bases:
nipy.algorithms.registration.transform.Transform
Methods
affine
(i)affines
()apply
(xyz)xyz is an (N, 3) array compose
(other)Compose this transform onto another left_compose
(other)-
__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.
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affine
(i)¶
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affines
()¶
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apply
(xyz)¶ xyz is an (N, 3) array
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compose
(other)¶ Compose this transform onto another
Parameters: other : Transform
transform that we compose onto
Returns: composed_transform : Transform
a transform implementing the composition of self on other
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left_compose
(other)¶
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param
¶
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