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wavelet compressed bitmap image format [message #19573]

Tue, 04 April 2000 00:00

dmarshall
Messages: 23
Registered: December 1997

Junior Member

Hello all,

IF
anyone has an IDL read routine for .WI images (these are what Corel
uses)
THEN
could they send, post or supply a URL
ENDIF ELSEIF
point me in a direction to find out more about this image format and
the internal structure of these files.
ENDELSE

Thanks,
Dave.

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Re: wavelet compressed bitmap image format [message #19675 is a reply to message #19573]

Thu, 06 April 2000 00:00

marc schellens[1]
Messages: 183
Registered: January 2000

Senior Member

IF $
anyone has an IDL read routine for .WI images (these are what Corel $
uses) $
THEN BEGIN
could they send, post or supply a URL
ENDIF ELSE BEGIN
point me in a direction to find out more about this image format and
the internal structure of these files.
ENDELSE

;-) marc

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Re: wavelet [message #24494 is a reply to message #19573]

Tue, 03 April 2001 20:34

Wayne Landsman
Messages: 117
Registered: January 1997

Senior Member

JMD wrote:

> Hi,
>
> I want to use wavelet on IDL without IDL wavelet toolbox.
>
> Where can I find a free IDL wavelet toolbox?
>

Um, I'm not sure whether I should be advertising this, but at least some
of the low-level procedures in $IDL_DIR/lib/wavelet/source do not
require a toolkit license. You just won't be able to use any of the GUI
features.

WV_CWT - Compute the continuous wavelet transform for one-dimensional
arrays.
WV_DENOISE - Use the wavelet transform to filter a 1 or 2-dimensional
array.
WV_FN_COIFLET - Return the Coiflet wavelet coefficients.
WV_FN_DAUBECHIES - Return the Daubechies wavelet coefficients.
WV_FN_GAUSSIAN - Return the Gaussian-derivative wavelet.
WV_FN_HAAR - Return the Haar wavelet coefficients.
WV_FN_MORLET - Return the Morlet wavelet.
WV_FN_PAUL - Return the Paul wavelet.
WV_FN_SYMLET - Return the Symlet wavelet coefficients.

Also the "Numerical Recipes" implementation of some Daubechies wavelet
coefficients has long been available as the intrinsic function WTN.

--Wayne Landsman landsman@mpb.gsfc.nasa.gov

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Re: wavelet [message #24495 is a reply to message #19573]

Tue, 03 April 2001 13:01

wmconnolley
Messages: 106
Registered: November 2000

Senior Member

JMD <delvit@onecert.fr> wrote:
> Where can I find a free IDL wavelet toolbox?

cheapskate ;-)

I found http://paos.colorado.edu/research/wavelets/ very useful

(much more usable for my purposes that the wavelet toolbox)

-W

--
William M Connolley | wmc@bas.ac.uk | http://www.nerc-bas.ac.uk/icd/wmc/
Climate Modeller, British Antarctic Survey | Disclaimer: I speak for myself
I'm a .signature virus! copy me into your .signature file & help me spread!

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Re: wavelet [message #24506 is a reply to message #19573]

Tue, 03 April 2001 02:06

Jaco van Gorkom
Messages: 97
Registered: November 2000

Member

JMD wrote:
>
> Hi,
>
> I want to use wavelet on IDL without IDL wavelet toolbox.
>
> Where can I find a free IDL wavelet toolbox?
>
> Thanks
>
> JMD

I don't know if such a thing can be found. A good place to
start looking for anything related to wavelets would be
Amara's page: http://www.amara.com/current/wavelet.html .
Jaco

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