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miracle of !order [message #42656]

Sat, 19 February 2005 04:10

R.Bauer
Messages: 1424
Registered: November 1998

Senior Member

Dear all

probably this is already known, but there is some risk to do something wrong
so I like to note it here. Probably David likes to put it on his marvellous
page.

I came to a problem reading and processing an image. If I have used the
default !order=0 all goes right while it wasn't possible to read the text
on the image so I switched to !order=1. Then a journey starts to understand
why all was a bit wrong.

I try to decribe the situation.

We have a circular pattern nearly in the center of a 1024x1024 image. To
compare all the images the pattern must be aligned. First we detected the
center of the circle and then we could do the alignment by rotating the
image around this center point. This was done in a widget by displaying the
image. The widget is used for selecting the center of the circle and some
other things. With !order=0 all goes right.

Then I switched to !order=1 and the results where different. It takes some
time to understand what goes wrong.
If you use !order=1 only the image on screen got's reordered. The function
which I used to rotate (rot) the data of the image does not recognice this
Sysvar set to 1 and it rotates the image not reordered.
The center point was wrong.

If you like to have reordered data on display and you like to do something
else with this image data then you should reorder it yourself. !order=0
should not be changed. That's the only way to use the right data in all
your routines.

cheers
Reimar

--
Forschungszentrum Juelich
email: R.Bauer@fz-juelich.de
http://www.fz-juelich.de/icg/icg-i/
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		miracle of !order By: R.Bauer on Sat, 19 February 2005 04:10
		Re: miracle of !order By: David Fanning on Sun, 20 February 2005 17:11

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