This module import functions for Geometric Transformation Filters

image_wralea.interpolation.interpolation.crop(img, xmin, ymin, xmax, ymax)

image_wralea.interpolation.interpolation.resample(img, transformation, order=1, output_shape=None, output_voxels=None, mode='constant', cval=0.0, prefilter=True)

It resamples a 2-D or 3-D image using a 4*4 transformation matrix or a deformation field .

The value of a point in the result image is determined by spline interpolation of the requested order.

Parameters:

• img
• transformation (array) - Matrix 4x4 or deformation field
• order (int) - optional

order corresponds to the degree of a polynomial used to the spline interpolation By default, order = 1 (linear interpolation)

• output_shape (tuple) - optional

The output shape can optionally be given. By default, it is equal to the input shape

• output_type (tuple) - optional

The output data type can optionally be given. By default, it is equal to the input data type

• output_voxels (tuple) - optional

The output voxels size can optionally be given. By default, it is equal to the input voxels size

• mode (string) - optional

Points outside the boundaries of the input are filled according to the given mode ("constant", "nearest", "reflect" or "wrap") By default, the given mode is "constant"

• prefilter (boolean) - optional

The parameter prefilter determines if the input is pre-filtered before interpolation (necessary for spline interpolation of order > 1) If False it is assumed that the input is already filtered

Returns Type:image resampled by the transformation

image_wralea.interpolation.interpolation.wra_rotate(img, angle, axes, reshape, output, order, mode, cval, prefilter)

Rotate an array.

The array is rotated in the plane defined by the two axes given by the axes parameter using spline interpolation of the requested order.

input : ndarray

The input array.

angle : float

The rotation angle in degrees.

axes : tuple of 2 ints, optional

The two axes that define the plane of rotation. Default is the first two axes.

reshape : bool, optional

If reshape is true, the output shape is adapted so that the input array is contained completely in the output. Default is True.

output : ndarray or dtype, optional

The array in which to place the output, or the dtype of the returned array.

order : int, optional

The order of the spline interpolation, default is 3. The order has to be in the range 0-5.

mode : str, optional

Points outside the boundaries of the input are filled according to the given mode ('constant', 'nearest', 'reflect' or 'wrap'). Default is 'constant'.

cval : scalar, optional

Value used for points outside the boundaries of the input if mode='constant'. Default is 0.0

prefilter : bool, optional

The parameter prefilter determines if the input is pre-filtered with spline_filter before interpolation (necessary for spline interpolation of order > 1). If False, it is assumed that the input is already filtered. Default is True.

rotate : ndarray or None

The rotated input. If output is given as a parameter, None is returned.

image_wralea.interpolation.interpolation.wra_shift(img, shift, output, order, mode, cval, prefilter)

Shift an array.

The array is shifted using spline interpolation of the requested order. Points outside the boundaries of the input are filled according to the given mode.

input : ndarray

The input array.

shift : float or sequence, optional

The shift along the axes. If a float, shift is the same for each axis. If a sequence, shift should contain one value for each axis.

output : ndarray or dtype, optional

The array in which to place the output, or the dtype of the returned array.

order : int, optional

The order of the spline interpolation, default is 3. The order has to be in the range 0-5.

mode : str, optional

Points outside the boundaries of the input are filled according to the given mode ('constant', 'nearest', 'reflect' or 'wrap'). Default is 'constant'.

cval : scalar, optional

Value used for points outside the boundaries of the input if mode='constant'. Default is 0.0

prefilter : bool, optional

The parameter prefilter determines if the input is pre-filtered with spline_filter before interpolation (necessary for spline interpolation of order > 1). If False, it is assumed that the input is already filtered. Default is True.

shift : ndarray or None

The shifted input. If output is given as a parameter, None is returned.

image_wralea.interpolation.interpolation.wra_zoom(img, zoom, output, order, mode, cval, prefilter)

Zoom an array.

The array is zoomed using spline interpolation of the requested order.

input : ndarray

The input array.

zoom : float or sequence, optional

The zoom factor along the axes. If a float, zoom is the same for each axis. If a sequence, zoom should contain one value for each axis.

output : ndarray or dtype, optional

The array in which to place the output, or the dtype of the returned array.

order : int, optional

The order of the spline interpolation, default is 3. The order has to be in the range 0-5.

mode : str, optional

Points outside the boundaries of the input are filled according to the given mode ('constant', 'nearest', 'reflect' or 'wrap'). Default is 'constant'.

cval : scalar, optional

Value used for points outside the boundaries of the input if mode='constant'. Default is 0.0

prefilter : bool, optional

The parameter prefilter determines if the input is pre-filtered with spline_filter before interpolation (necessary for spline interpolation of order > 1). If False, it is assumed that the input is already filtered. Default is True.

zoom : ndarray or None

The zoomed input. If output is given as a parameter, None is returned.