#### Previous topic

scipy.ndimage.filters.generic_filter1d

#### Next topic

scipy.ndimage.filters.generic_laplace

# scipy.ndimage.filters.generic_gradient_magnitude

`scipy.ndimage.filters.``generic_gradient_magnitude`(input, derivative, output=None, mode='reflect', cval=0.0, extra_arguments=(), extra_keywords=None)

  Gradient magnitude using a provided gradient function.

  > Parameters: | input : array_like Input array to filter. 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, optional The output parameter passes an array in which to store the filter output. mode : {‘reflect’, ‘constant’, ‘nearest’, ‘mirror’, ‘wrap’}, optional The mode parameter determines how the array borders are handled, where cval is the value when mode is equal to ‘constant’. Default is ‘reflect’ 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