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Re: IDL's built-in function DILATE and ERODE doesn't work as described in help [message #50714 is a reply to message #50709]

Thu, 12 October 2006 00:41

Karsten Rodenacker
Messages: 98
Registered: July 1997

Member

Don't use IDL's dilate and erode without embedding your data into a
sufficiently large array. Border handling is not coherently implemented.
That is a large disadvantage, not to say an error, for the application of
math. morph. operations in sequences. Ask for improvement, possibly ITTVIS
can be convinced!
Regards
Karsten

Am Thu, 12 Oct 2006 04:33:59 +0200 schrieb Gongqin Shen
<gqshen2008@gmail.com>:

> For example, if you have the data as a = [0, 1, 1, 0] and kernel as k
> = [1, 1], according to the help provided by IDL, the result of running
> the code:
> result = DILATE(a, k)
> will be [0, 1, 1, 0], however, IDL's output is [1, 1, 1, 0].
> ERODE performs in a similar way. Does that mean the help is actually
> broken?
>

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[Message index]

		Re: IDL's built-in function DILATE and ERODE doesn't work as described in help By: Jean H. on Fri, 13 October 2006 09:37
		Re: IDL's built-in function DILATE and ERODE doesn't work as described in help By: Karsten Rodenacker on Fri, 13 October 2006 08:05
		Re: IDL's built-in function DILATE and ERODE doesn't work as described in help By: Haje Korth on Fri, 13 October 2006 04:53
		Re: IDL's built-in function DILATE and ERODE doesn't work as described in help By: Jo Klein on Fri, 13 October 2006 01:46
		Re: IDL's built-in function DILATE and ERODE doesn't work as described in help By: btt on Thu, 12 October 2006 11:41
		Re: IDL's built-in function DILATE and ERODE doesn't work as described in help By: Karsten Rodenacker on Thu, 12 October 2006 10:22
		Re: IDL's built-in function DILATE and ERODE doesn't work as described in help By: Karsten Rodenacker on Thu, 12 October 2006 10:06
		Re: IDL's built-in function DILATE and ERODE doesn't work as described in help By: gqshen2008@gmail.com on Thu, 12 October 2006 08:32
		Re: IDL's built-in function DILATE and ERODE doesn't work as described in help By: Karl Schultz on Thu, 12 October 2006 07:56
		Re: IDL's built-in function DILATE and ERODE doesn't work as described in help By: Jo Klein on Thu, 12 October 2006 06:27
		Re: IDL's built-in function DILATE and ERODE doesn't work as described in help By: Haje Korth on Thu, 12 October 2006 05:22
		Re: IDL's built-in function DILATE and ERODE doesn't work as described in help By: Karsten Rodenacker on Thu, 12 October 2006 00:41
		Re: IDL's built-in function DILATE and ERODE doesn't work as described in help By: David Fanning on Wed, 11 October 2006 19:40
		Re: IDL's built-in function DILATE and ERODE doesn't work as described in help By: gqshen2008@gmail.com on Mon, 16 October 2006 13:21

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