[Insight-users] MultiResMIRegistration Application?

[Lydia Ng]

Hi Nasser,

I think trying to recover a 90 deg misalignment is a big ask. The
capture range is probably closer to 10 degrees. So your "simple" test is
actually quite difficult. Have you tried things out with a smaller
rotation?

I don't think in the app any transform is ever applied to the fixed
image - so I am curious as to why you observe a transform. The other
issue is that this sample application originally only handled signed
short input data - could that be partially the problem?

- Lydia


> -----Original Message-----
> From: Nasser Kashou [mailto:kashoun at ee . eng . ohio-state . edu]
> Sent: Wednesday, August 27, 2003 3:17 PM
> To: insight-users at itk . org
> Subject: [Insight-users] MultiResMIRegistration Application?
>=20
> Hi,
> I'm testing the algorithm used in the MultiResMIRegistration
Application.
> The
> test is very simple.  I have a fixed target image and a moving source
> image
> which is rotated 90 deg. ClockWise (about the z-axis).  Below is my
param
> file
> for one of these tests:
>=20
> C:/ResearchStuff/Images/rat01_128x128x256_1channels_8bit.raw
> 1
> 128 128 256
> 1 1 1
> C:/ResearchStuff/Images/rot90rat01_128x128x256_1channels_8bit.raw
> 1
> 128 128 256
> 1 1 1
> 0 1 2
> 0 0 0
> 1
> 1 1 1
> 1 1 1
> 5000
> 1e-10
> 1
> wk01vsRot90wk01_out_u8_1lev_sc1_r1e-10_5000it_ax012
>=20
> -------------------------------
> One observation I made is that the fixed image is rotated 90deg CW,
and
> the
> moving image is rotated 90deg CCW. I guess before even processing
> begins?...so
> Q1.  Why and where is this transformation made?
>=20
> Also, the registered image is being aligned with the Moving Source
image,
> rather than the fixed target image, unless I flip one of the axis of
the
> moving
> image.
> Q2.  Why doesn't the registered image converge to be the same
orientation
> as
> the fixed target image?
>=20
> please let me know if there is something i'm missing.
> thanks Nasser Kashou (The Ohio State University)
> --
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