comp.lang.idl-pvwave archive: archive » Re: Moving Average on Hyperspectral dataset

Home » Public Forums » archive » Re: Moving Average on Hyperspectral dataset

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: Moving Average on Hyperspectral dataset [message #53152 is a reply to message #53142]

Mon, 26 March 2007 19:14

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

JD Smith writes:

>
> image=smooth(image,[1,1,width])
>
>> With the loops the code takes about 3 hours ... Is there a way to speed it
>> up ?
>
> If that 1.2GB (*2) array is pushing your memory limits, consider doing
> it in "chunks", e.g. 50 samples at a time.

I thought it might go faster if you moved the dimension
you are smoothing into contiguous memory first:

image = Transpose(image, [2,0,1])
image = Smooth(image, [width, 1, 1])

But with an image(100,200,300), it took 0.281 seconds
with and without the TRANSPOSE. Is the transposition
really negligibly fast?

I note that the LOOP method took nearly 76 seconds!! :-)

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

Report message to a moderator

[Message index]

		Re: Moving Average on Hyperspectral dataset By: JD Smith on Tue, 27 March 2007 10:08
		Re: Moving Average on Hyperspectral dataset By: David Fanning on Mon, 26 March 2007 19:14
		Re: Moving Average on Hyperspectral dataset By: JD Smith on Mon, 26 March 2007 17:38

Previous Topic:	Re: strange behaviour of bar_plot
Next Topic:	Problems with converting map projection in ENVI

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Fri Oct 10 17:41:09 PDT 2025

Total time taken to generate the page: 0.48270 seconds