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Re: Blanking all 5x5 windows with less than X 'on' pixels in them [message #74543 is a reply to message #74542]

Fri, 21 January 2011 00:07

rogass
Messages: 200
Registered: April 2008

Senior Member

On 20 Jan., 20:19, Robin Wilson <ro...@rtwilson.com> wrote:
> Hi,
>
> I've got a binary image and I want to clean it up a bit by removing all
> pixels (or small groups of pixels) which are surrounded by a lot of space.
>
> I can easily write code using CONVOL to tell me how many pixels were
> 'on' in that window, but I can't see an easy (and fast) way of blanking
> (as in, setting all the pixels to zero) in any windows where the CONVOL
> function has given a value greater than X.
>
> I can think of a way to do it in a loop (looping over all of the points
> that CONVOL found which were greater than X and then constructing 5x5
> windows around them), but there must be a proper 'IDL Way'. Any ideas?
>
> Robin

Hi Robin,
i have such a vectorised function. Please give more details. Do you
want to clean all pixels including the center pixel in a moving
window, if the center pixel is below a threshold?

Cheers

CR

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[Message index]

		Re: Blanking all 5x5 windows with less than X 'on' pixels in them By: rogass on Sat, 22 January 2011 02:11
		Re: Blanking all 5x5 windows with less than X 'on' pixels in them By: rogass on Fri, 21 January 2011 06:23
		Re: Blanking all 5x5 windows with less than X 'on' pixels in them By: Axel Martínez on Fri, 21 January 2011 02:52
		Re: Blanking all 5x5 windows with less than X 'on' pixels in them By: Axel Martínez on Fri, 21 January 2011 02:41
		Re: Blanking all 5x5 windows with less than X 'on' pixels in them By: Robin Wilson on Fri, 21 January 2011 01:02
		Re: Blanking all 5x5 windows with less than X 'on' pixels in them By: rogass on Fri, 21 January 2011 00:07
		Re: Blanking all 5x5 windows with less than X 'on' pixels in them By: Gray on Thu, 20 January 2011 15:24
		Re: Blanking all 5x5 windows with less than X 'on' pixels in them By: ben.bighair on Thu, 20 January 2011 12:03
		Re: Blanking all 5x5 windows with less than X 'on' pixels in them By: David Fanning on Thu, 20 January 2011 11:52
		Re: Blanking all 5x5 windows with less than X 'on' pixels in them By: Robin Wilson on Thu, 20 January 2011 11:35
		Re: Blanking all 5x5 windows with less than X 'on' pixels in them By: ben.bighair on Thu, 20 January 2011 11:31

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