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Re: Blanking all 5x5 windows with less than X 'on' pixels in them [message #74548 is a reply to message #74544]

Thu, 20 January 2011 12:03

ben.bighair
Messages: 221
Registered: April 2007

Senior Member

On 1/20/11 2:35 PM, Robin Wilson wrote:
> Hi Ben
>
>> Have you looked at MORPH_OPEN? I think it would be a good place to start.
>
> I have investigated this, but I don't think it'll do what I want as it
> will affect the other pixels in the image too. I'm hoping just to
> operate on pixels that have a lot of space around them (for example,
> maybe with a 9x9 window, and only having three pixels turned on). Can
> MORPH_OPEN do this?
>
> Robin
>

Hmmm. So, it isn't just a matter of the size of the speck but also the
amount of white space around it.

Filtering by size isn't such a big issue - you could even use histogram
operating on a labeled version of your image. You could also use
Morph_HitOrMiss for this.

The Morph_TopHat function might also be worth checking out. You can
control the amount of "brim-width" to allow when you specify the
structure.

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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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