pyramid_reduce
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skimage.transform.pyramid_reduce(image, downscale=2, sigma=None, order=1, mode='reflect', cval=0)
[source] -
Smooth and then downsample image.
Parameters: image : array
Input image.
downscale : float, optional
Downscale factor.
sigma : float, optional
Sigma for Gaussian filter. Default is
2 * downscale / 6.0
which corresponds to a filter mask twice the size of the scale factor that covers more than 99% of the Gaussian distribution.order : int, optional
Order of splines used in interpolation of downsampling. See
skimage.transform.warp
for detail.mode : {‘reflect’, ‘constant’, ‘edge’, ‘symmetric’, ‘wrap’}, optional
The mode parameter determines how the array borders are handled, where cval is the value when mode is equal to ‘constant’.
cval : float, optional
Value to fill past edges of input if mode is ‘constant’.
Returns: out : array
Smoothed and downsampled float image.
References
[R380] http://web.mit.edu/persci/people/adelson/pub_pdfs/pyramid83.pdf
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