ImagePyramid
ImagePyramid[image] creates a Gaussian image pyramid formed from image.
ImagePyramid[image,pyrtype] returns a Gaussian or Laplacian pyramid depending of the specified pyrtype.
ImagePyramid[image,pyrtype,n] returns up to n levels of the pyramid.
ImagePyramid[image,pyrtype,{size}] returns pyramid levels down to image dimensions given by size.
ImagePyramid[image,pyrtype,n,s] returns a pyramid with successive levels downsampled by factor s.
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