| Re: IDL's built-in function DILATE and ERODE doesn't work as described in help [message #50704 is a reply to message #50701] |
Thu, 12 October 2006 08:32   |
gqshen2008@gmail.com
Messages: 9
Registered: October 2005
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Junior Member |
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If possible, can I know when the fix will appear in IDL? Thx.
Karl Schultz wrote:
> On Thu, 12 Oct 2006 09:41:29 +0200, Karsten Rodenacker wrote:
>
>> 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?
>>>
>
> All I can say is that we know about this problem and fixing it is "on the
> list". Karsten has already sent me some more detail. If anyone else
> would like to submit additional input, besides what is already in this
> thread, email it to kschultz at ittvis dot com. Thanks!
>
> Karl
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