[vtkusers] Rotate vtkImage with vtkmatrix4x4

[Jothy]

Should I multiply the matrix with the ratation value?

If so, how to do that? Using MultipyPoint.

Thanks

Jothy

On Tue, Mar 1, 2011 at 4:58 PM, Jothy <jothybasu at gmail.com> wrote:

> Yes it doesn't rotate at all!
>
> My axial elements were
>
> reslice->DeepCopy( imageReader->GetDirectionCosines());
> reslice->SetElement(0,3,IPP[0]);
> reslice->SetElement(1,3,IPP[1]);
> reslice->SetElement(2,3,IPP[2]);
>
> My images have
>
> Image position: -275 -524 -122.441
> Image Dims: 512 512 98
> Image Origin: -275 -524 -122.441
> ImageOrient: 1 0 -1.22465e-16 0 1 0
>
>
>
>
>
> But this is changing only the y axis (some translation in Y). But no
> rotation.
>
> Any help is greatly appreciated.
>
> Thanks again
>
> Jothy
>
>
> On Tue, Mar 1, 2011 at 4:42 PM, David Gobbi <david.gobbi at gmail.com> wrote:
>
>> Hi Jothy,
>>
>> When you say "doesn't rotate the image", do you mean that it does
>> nothing at all?  What are the elements of your direction cosines matrix?
>>
>> Also, note that direction cosines matrix is a pure rotation matrix.
>> i.e. it rotates about (0,0,0).  You need to create a matrix that
>> rotates around a particular point in space.
>>
>>  - David
>>
>>
>> On Tue, Mar 1, 2011 at 9:28 AM, Jothy <jothybasu at gmail.com> wrote:
>> > Thanks!
>> >
>> > Now my images appeasr like the one shown in figure.
>> >
>> > I need to rotate the image and dose about the ImagePositionPatient
>> > upside-down.
>> >
>> > I tried vtkImageFlip - it invalidates the dicom coordinate system and
>> the
>> > dose and image doesn't match.
>> >
>> > I tried this
>> >
>> >       vtkMatrix4x4 *invert = vtkMatrix4x4::New();
>> >
>> >         invert->DeepCopy( imageReader->GetDirectionCosines());
>> >
>> >         invert->Invert();
>> >
>> >         vtkImageReslice *reslice = vtkImageReslice::New();
>> >
>> >         reslice->SetResliceAxes( invert );
>> >
>> >         reslice->SetInput(this->imageData);
>> >
>> >         reslice->Update();
>> >
>> >
>> > But it doesn't rotate the image.How to rotate the image?
>> >
>> > Thanks
>> >
>> > Jothy
>> >
>> >
>> > On Tue, Mar 1, 2011 at 4:07 PM, Jothy <jothybasu at gmail.com> wrote:
>> >>
>> >> But in this example FileLowerLeft is switched off.
>> >>
>> >> Thanks
>> >>
>> >> Jothy
>> >>
>> >> On Tue, Mar 1, 2011 at 3:50 PM, Mathieu Malaterre
>> >> <mathieu.malaterre at gmail.com> wrote:
>> >>>
>> >>> jothy, I think what you are looking for is already in gdcm, have a
>> look
>> >>> at:
>> >>> gdcmreslice.cxx
>> >>>
>> >>> hth
>> >>> On Tue, Mar 1, 2011 at 4:31 PM, Jothy <jothybasu at gmail.com> wrote:
>> >>> > Hi all,
>> >>> >
>> >>> > I am trying to rotate vtkImageData using vtkMatrix4x4 about a point.
>> is
>> >>> > there any example on how to do this?
>> >>> >
>> >>> > Thanks
>> >>> >
>> >>> > Jothy
>> >>> >
>> >>> > _______________________________________________
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>> >>> >
>> >>>
>> >>>
>> >>>
>> >>> --
>> >>> Mathieu
>> >>
>> >
>> >
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>>
>
>
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