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Module « scipy.ndimage »

Fonction generic_gradient_magnitude - module scipy.ndimage

Signature de la fonction generic_gradient_magnitude

def generic_gradient_magnitude(input, derivative, output=None, mode='reflect', cval=0.0, extra_arguments=(), extra_keywords=None, *, axes=None) 

Description

help(scipy.ndimage.generic_gradient_magnitude)

Gradient magnitude using a provided gradient function.

Parameters
----------
input : array_like
    The input array.
derivative : callable
    Callable with the following signature::

        derivative(input, axis, output, mode, cval,
                   *extra_arguments, **extra_keywords)

    See `extra_arguments`, `extra_keywords` below.
    `derivative` can assume that `input` and `output` are ndarrays.
    Note that the output from `derivative` is modified inplace;
    be careful to copy important inputs before returning them.
output : array or dtype, optional
    The array in which to place the output, or the dtype of the
    returned array. By default an array of the same dtype as input
    will be created.
mode : str or sequence, optional
    The `mode` parameter determines how the input array is extended
    when the filter overlaps a border. By passing a sequence of modes
    with length equal to the number of dimensions of the input array,
    different modes can be specified along each axis. Default value is
    'reflect'. The valid values and their behavior is as follows:

    'reflect' (`d c b a | a b c d | d c b a`)
        The input is extended by reflecting about the edge of the last
        pixel. This mode is also sometimes referred to as half-sample
        symmetric.

    'constant' (`k k k k | a b c d | k k k k`)
        The input is extended by filling all values beyond the edge with
        the same constant value, defined by the `cval` parameter.

    'nearest' (`a a a a | a b c d | d d d d`)
        The input is extended by replicating the last pixel.

    'mirror' (`d c b | a b c d | c b a`)
        The input is extended by reflecting about the center of the last
        pixel. This mode is also sometimes referred to as whole-sample
        symmetric.

    'wrap' (`a b c d | a b c d | a b c d`)
        The input is extended by wrapping around to the opposite edge.

    For consistency with the interpolation functions, the following mode
    names can also be used:

    'grid-constant'
        This is a synonym for 'constant'.

    'grid-mirror'
        This is a synonym for 'reflect'.

    'grid-wrap'
        This is a synonym for 'wrap'.
cval : scalar, optional
    Value to fill past edges of input if `mode` is 'constant'. Default
    is 0.0.
extra_keywords : dict, optional
    dict of extra keyword arguments to pass to passed function.
extra_arguments : sequence, optional
    Sequence of extra positional arguments to pass to passed function.
axes : tuple of int or None
    The axes over which to apply the filter. If a `mode` tuple is
    provided, its length must match the number of axes.

Returns
-------
generic_gradient_matnitude : ndarray
    Filtered array. Has the same shape as `input`.

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