skimage.transform.pyramids:pyramid_reduce

Parameters

image : ndarray

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'.

preserve_range : bool, optional

Whether to keep the original range of values. Otherwise, the input image is converted according to the conventions of img_as_float. Also see https://scikit-image.org/docs/dev/user_guide/data_types.html

channel_axis : int or None, optional

If None, the image is assumed to be a grayscale (single channel) image. Otherwise, this parameter indicates which axis of the array corresponds to channels.