[MINC-users] Registration using only translation and scale in minc

[Abraham Gedamu]

Hey Andrew,

Running minctracc:

minctracc -lsq9 -w_rotations 0 0 0 source.mnc.gz target.mnc.gzno_rotation.xfm
COG of v1: 60.239826 68.026634 58.329350
COG of v2: 61.871235 58.958786 59.136723
   [trans] = 1.631409 -9.067848 0.807373
Initial objective function val = 0.07533003
Final objective function value = 0.05163525

more no_rotation.xfm
Transform_Type = Linear;
Linear_Transform =
 0.974233269691467 -0.106358632445335 0.116122744977474 4.05126190185547
 0.0418491959571838 0.463993549346924 0.0738773718476295 22.1566772460938
 -0.139944493770599 -0.152131617069244 1.03475058078766 7.68611145019531;

xfm2param no_rotation.xfm
after parameter extraction
-center         0.00000    0.00000    0.00000
-translation    4.05126   22.15668    7.68611
-rotation      -8.36385    7.62126    5.13547
-scale          0.98688    0.47170    1.05520
-shear          0.00000    0.00000    0.00000

Abe

On 7/26/06, Abraham Gedamu <abraham.gedamu at gmail.com> wrote:
>
> I tried minctracc -lsq9 w_rotations 0 0 0 source.mnc target.mnc out.xfmseveral times with different source files and target files, however when I
> run xfm2param on the out.xfm file, my rotations are not 0.  Does anyone no
> why this might occur?
>
> Thanks,
>
> Abe
>
>
>
> On 7/25/06, Abraham Gedamu <abraham.gedamu at gmail.com> wrote:
> >
> > Hello,
> >
> > I would like to register one image to another using only translation and
> > scale.  I have tried using minctracc but there are no options that allow the
> > use of only translation and scale.  I could get all the parameters and set
> > the ones I don't want to zero, but then the values for scale and translation
> > will not be the correct ones since the paramters seem to depend on one
> > another.  Any advice in this are would be greatly appreciated.
> >
> > Thanks
> >
> > Abe
> >
>
>