scipy.ndimage.
fourier_gaussian#
- scipy.ndimage.fourier_gaussian(input, sigma, n=-1, axis=-1, output=None)[source]#
- Multidimensional Gaussian fourier filter. - The array is multiplied with the fourier transform of a Gaussian kernel. - Parameters:
- inputarray_like
- The input array. 
- sigmafloat or sequence
- The sigma of the Gaussian kernel. If a float, sigma is the same for all axes. If a sequence, sigma has to contain one value for each axis. 
- nint, optional
- If n is negative (default), then the input is assumed to be the result of a complex fft. If n is larger than or equal to zero, the input is assumed to be the result of a real fft, and n gives the length of the array before transformation along the real transform direction. 
- axisint, optional
- The axis of the real transform. 
- outputndarray, optional
- If given, the result of filtering the input is placed in this array. 
 
- Returns:
- fourier_gaussianndarray
- The filtered input. 
 
 - Examples - >>> from scipy import ndimage, datasets >>> import numpy.fft >>> import matplotlib.pyplot as plt >>> fig, (ax1, ax2) = plt.subplots(1, 2) >>> plt.gray() # show the filtered result in grayscale >>> ascent = datasets.ascent() >>> input_ = numpy.fft.fft2(ascent) >>> result = ndimage.fourier_gaussian(input_, sigma=4) >>> result = numpy.fft.ifft2(result) >>> ax1.imshow(ascent) >>> ax2.imshow(result.real) # the imaginary part is an artifact >>> plt.show() 