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Re: Faster image median filtering [message #76725 is a reply to message #76662]

Tue, 28 June 2011 10:33

Juggernaut
Messages: 83
Registered: June 2008

Member

On Jun 24, 9:48 am, "Deckard++;" <arthur.vi...@gmail.com> wrote:
> Hi,
>
> I am confronted with a performance issue related to median filtering
> of images using the median() function of IDL. I have rather extended
> sets (several thousands) of 1500x1500 images, and I need to median
> filter each of them. So far I have been using this to filter them
>
> img_filtered = median(img, boxsize)
>
> The problem is that it take ~5 seconds per image for boxsize=15, which
> is ok for a few images but really time consuming when considering
> thousands of images. I have a few questions:
>
> 1- is there a way to speed-up median filtering that I am not aware of?
> 2- do you know if IDL implementation of 2D median() is the most
> efficient?
> 3- if not, are you aware of a DLM that would implement a faster median
> filtering of images?
>
> Thank a lot in advance.
>
> Best regards,
>
> -- Arthur;

If you have multiple cores on your computer try out the idl_idlbridge
object in IDL and just run multiple instances of your median
processing at once.

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[Message index]

		Faster image median filtering By: Deckard++; on Fri, 24 June 2011 06:48
		Re: Faster image median filtering By: Juggernaut on Tue, 28 June 2011 10:33
		Re: Faster image median filtering By: Deckard++; on Sun, 03 July 2011 06:53
		Re: Faster image median filtering By: wlandsman on Fri, 24 June 2011 15:33
		Re: Faster image median filtering By: Deckard++; on Sun, 03 July 2011 06:54

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