python Programming Glossary: fftconvolve

FFT-based 2D convolution and correlation in Python

http://stackoverflow.com/questions/1100100/fft-based-2d-convolution-and-correlation-in-python

fft share improve this question I found scipy.signal.fftconvolve as also pointed out by magnus but didn't realize at the time.. 2 b asarray 1 2 1 ... 0 0 0 ... 1 2 1 In 3 scipy.signal.fftconvolve a b mode 'same' Out 3 array 13. 20. 17. 18. 24. 18. 13. 20... 1 2 etc. So I changed my accepted answer to the built in fftconvolve function. Correlation of course is the same thing as convolution..

Comparing image in url to image in filesystem in python

http://stackoverflow.com/questions/13875989/comparing-image-in-url-to-image-in-filesystem-in-python

the following code import numpy from scipy.signal import fftconvolve def ssim im1 im2 window k 0.01 0.03 l 255 See https ece.uwaterloo.ca.. c1 k 0 l 2 c2 k 1 l 2 window window numpy.sum window mu1 fftconvolve im1 window mode 'valid' mu2 fftconvolve im2 window mode 'valid'.. window mu1 fftconvolve im1 window mode 'valid' mu2 fftconvolve im2 window mode 'valid' mu1_sq mu1 mu1 mu2_sq mu2 mu2 mu1_mu2..

Convolution of two three dimensional arrays with padding on one side too slow

http://stackoverflow.com/questions/14786920/convolution-of-two-three-dimensional-arrays-with-padding-on-one-side-too-slow

slow and not usable. My second version was C scipy.signal.fftconvolve A B mode full But this computes only the elements max dimA dimB.. regardless of how fast it is implemented. In my tests the fftconvolve method crosses over to be faster around N 20 and by N 32 is.. import matplotlib.pyplot as plt from scipy.signal import fftconvolve from numba import jit double # Numba'ing the function with the..

Fastest 2D convolution or image filter in Python

http://stackoverflow.com/questions/5710842/fastest-2d-convolution-or-image-filter-in-python

t This takes 6.9 sec on my machine... Compare this with fftconvolve t timeit.timeit stmt signal.fftconvolve x y mode 'same' number.. Compare this with fftconvolve t timeit.timeit stmt signal.fftconvolve x y mode 'same' number 1 setup import numpy as np from scipy..

• fftconvolve
• fg
• fget
• fgets
• fgs.add
• fh
• fi
• fib
• fibonacci
• fichier
• fichier1
• fid
• fiddle
• fiddling
• fido
• field's
• field.errors
• field
• field.label_tag
• field.name
• field1
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• field3
• fieldname
• fieldnames
• fields
• fieldsets
• fieldwidths
• field_name
• fifo
• fifth
• fifty
• fig.add_axes
• fig.add_subplot
• fig.canvas.draw
• fig.canvas.mpl_connect
• fig.colorbar
• fig
• fig.savefig
• fig.set_size_inches
• fig.show
• fig.subplots_adjust
• fig1
• fighting
• figleaf
• figsize
• figure
• figurecanvas
• figurecanvasagg
• figurecanvastkagg
• figured
• figures
• figuring
• file's
• file.close
• file
• file.py
• file.read
• file.readline
• file.readlines
• file.seek
• file.tell
• file.txt
• file.write
• file1
• file1.txt
• file2
• file2.txt
• file3
• filea