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dilate [message #8313]

Wed, 26 February 1997 00:00

Achim Hein
Messages: 42
Registered: February 1996

Member

Some days ago, we spoke about ERODE and DILATE-Routines. To offer our
routines, we have to export them to 'C' - so the dilating routine too.
While testing the DILATE routine, we find a little difference between
the IDL/WAVE and the C-routines.

As I understand it till now it seems to be a problem in IDL or - there
is truly the possibility - I do not understand it right.

First of all, the dilation looks if only one pixel of an interesting
area (field) is equal to the structuring element before setting the
resulting pixel (middle of the structuring element) to one. The
resulting image has the same size as the incoming array.

So let us look the following example:

the field is given by:
..............
0 0 0 1 1 ... second row
0 0 0 1 1 ... first row

dilated with the structuring element:

0 1 0
1 1 1
0 1 1

I expect the result like this:
...
0 0 1 1 ... second row
0 0 1 1 ... first row

But IDL gives:

...
0 0 1 1 1 ... second row
0 0 0 1 1 ... first row

Can anybody explain this? Borderproblems?

Thanks

Achim
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PB2 / ZESS - Uni-GH-Siegen
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Fax: 0271/740-2336
Mail: Hein@nv.et-inf.uni-siegen.de
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