Steerable pyramid, described in"The Steerable Pyramid: A Flexible Architecture
for Multi-Scale Derivative Computation", E P Simoncelli and W T Freeman,
Second Int'l Conf on Image Processing, 1995.
Also see "The Design and Use of Steerable Filters" by Freeman and Adelson,
and "Shiftable Multiscale Transforms" by Simoncelli et al.
Steerable pyramid, described in"The Steerable Pyramid: A Flexible Architecture for Multi-Scale Derivative Computation", E P Simoncelli and W T Freeman, Second Int'l Conf on Image Processing, 1995.
Also see "The Design and Use of Steerable Filters" by Freeman and Adelson, and "Shiftable Multiscale Transforms" by Simoncelli et al.