toolkit.filtering.steerablepyramid
H3
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package steerablepyramid
Create an H3 kernel.
Create an H3 kernel.
Index of kernel in the G3 basis set.
Size (height and width) of kernel.
Implements the 3rd order odd kernel for the steerable pyramid. This comes from Tables I and II of "Design and Use of Steerable Filters", Freeman and Adelson.
A comment in their Matlab code says these old filters from their 1991 paper are not very accurate, but their newer, more accurate, filter generator code was not included in the distribution.
The value of
Scalein the code was determined empirically by minimizing the mean square error beteen the old G3 filters from 1991 paper and the new G3 filters in their Matlab code. This is not too important here since we're not using this G3 kernel in the pyramid, but it helped us calibrate the crummy H3 filter here which we are using.