PDL folks,
As part of a proposal effort I just hacked Daniel Vollmer's wavelet
compression library into a cheesy PDL module. Vollmer's code is
particularly nice because it allows compression of multiple bitplanes
(read: hyperspectral images), with specified weighting of the
importance of each bitplane, and because it works with 16-bit data and
is therefore useful for scientific images as well as snapshots.
The module defines two entry points: PDL::wvcomp, which accepts an
image (up to three dimensions, with the 2 dim running across R/G/B or
what-have-you) and a number of bits per pixel to which the thing
should be compressed, and returns a greatly compressed glom of data as
a 1-D PDL; and PDL::wvexp, which accepts a greatly compressed glom of
data and returns an approximation of the original image.
Daniel has released the work under a gzip license, which is more
permissive than the Artistic license we use for PDL. I think it is
also compatible with it. If there is interest, I'll be happy to clean
it up and either put it in CPAN or in the PDL distribution (though
not, of course, till after our proposal goes in). What sayeth the
community?
Cheers,
Craig
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