[ITK] [ITK-users] Conversion of itk::Image to other formats

Thu Mar 10 12:06:35 EST 2016

Hi Matt,

Let me try it this way. I tried all the following prototypes, but none of
them worked. Probably some C++ syntax problem...

template <class T1, int T2>
extern int ItkToAvs(AVSfield** ppAvs, itk::Image<T1, T2> pItkImage);

template <int T2>
extern int ItkToAvs(AVSfield** ppAvs, itk::Image<fPixelType, T2> pItkImage);

extern int ItkToAvs(AVSfield** ppAvs, itk::Image<fPixelType, 3> pItkImage);

template< typename TImage>
extern int ItkToAvs(AVSfield** ppAvs, TImage* pItkImage);

template< typename TPixel, unsigned int VImageDimension>
extern int ItkToAvs(AVSfield** ppAvs, const itk::Image<TPixel,
VImageDimension> pItkImage);

template< typename TObjectType>
extern int ItkToAvs(AVSfield** ppAvs, const itk::SmartPointer<TObjectType>
pItkImage);

The first parameter is the output of the function. The second parameter is
*any* itk image.
As you can see, I don't know what I'm doing... Any idea what a good
prototype would be?

Greetings,
Lambert

On Thu, Mar 10, 2016 at 5:40 PM, Matt McCormick <matt.mccormick at kitware.com>
wrote:

> Hi Lambert,
>
> A function prototype without templates would be run-time to run-time
> type comparison and conversion.  The example shows how to do run-time
> to compile-time comparison, and it is relevant to both in-memory and
> file conversion.
>
> HTH,
> Matt
>
> On Thu, Mar 10, 2016 at 11:28 AM, Lambert Zijp <ljzijp at gmail.com> wrote:
> > Hi Sarthak,
> > There is no file I/O involved. It is about conversion in memory. In my
> > original post, MyFormat is a struct containing things like pixeltype and
> > number of dimensions and a couple of pointers to the pixels, the sizes of
> > the dimensions, and the coordinates. Conversion from MyFormat to itk, I
> got
> > more or less working. Now I want to convert from itk to MyFormat. A
> function
> > prototype is needed...
> >
> > Greetings,
> > Lambert
> >
> > On Thu, Mar 10, 2016 at 5:02 PM, Scapegoat Sarthak
> > <scapegoat.sarthak at gmail.com> wrote:
> >>
> >> Hi Lambert,
> >>
> >> What you could do is to make a function what just takes in a file name
> as
> >> input and call the templated ITK function inside as an inline function.
> >> There is no way I know to do I/O in ITK without using templates.
> >>
> >> Best,
> >> Sarthak
> >>
> >>
> >> On 10 March 2016 at 10:55, Lambert Zijp <ljzijp at gmail.com> wrote:
> >>>
> >>> Hi Scapegoat,
> >>> Thank you for responding. What would the function prototype then be (of
> >>> function that accepts any itk image. I mean, the syntax, preferably not
> >>> templated)?
> >>> Because I deal mostly with 3D or 4D signed short pixels (medical
> images),
> >>> I keep them as they are: half the memory consumption and easier
> histogram
> >>> computations.
> >>>
> >>> Greetings,
> >>> Lambert
> >>>
> >>> On Thu, Mar 10, 2016 at 4:35 PM, Scapegoat Sarthak
> >>> <scapegoat.sarthak at gmail.com> wrote:
> >>>>
> >>>> I would advice you to perform a check on the image dimensions (2 or 3)
> >>>> and keep the pixel type as float throughout. In any case you will be
> doing
> >>>> computation so the extra memory is going to be helpful.
> >>>>
> >>>>
> >>>> On 10 March 2016 at 10:28, Matt McCormick <matt.mccormick at kitware.com
> >
> >>>> wrote:
> >>>>>
> >>>>> Hi Lambert,
> >>>>>
> >>>>> This example shows how to read in an unknown image type. It
> >>>>> demonstrates how to go between run-time type specification and the
> >>>>> compile-image type specification of ITK.
> >>>>>
> >>>>>
> >>>>>
> http://itk.org/ITKExamples/src/IO/ImageBase/ReadUnknownImageType/Documentation.html
> >>>>>
> >>>>> This approach could be used for your problem.
> >>>>>
> >>>>> HTH,
> >>>>> Matt
> >>>>>
> >>>>> On Thu, Mar 10, 2016 at 9:56 AM, Lambert Zijp <ljzijp at gmail.com>
> wrote:
> >>>>> > Dear itk users,
> >>>>> > I'm new to itk and also not very proficient in C++...
> >>>>> > I want to try some deformable registration methods implemented in
> >>>>> > itk, and
> >>>>> > need to convert my own format of images and volumes to itk, and
> back.
> >>>>> > For conversion to itk, I use 'ImportImageFilter', because I do not
> >>>>> > want to
> >>>>> > make a copy of the pixels/voxels.
> >>>>> > Converting itk images and volumes back to my own format, is giving
> me
> >>>>> > a
> >>>>> > headache; I'm confused about 'Image', SmartPointer and ConstPointer
> >>>>> > and
> >>>>> > template stuff.
> >>>>> > Could you get me started by suggesting me a function prototype?
> >>>>> >
> >>>>> > Something like:
> >>>>> > int ItkToMyFormat(MyFormat** ppMyFormat, itk::Image* pItkImage);
> >>>>> >
> >>>>> > The ItkImage can be any pixeltype, any dimension, and vector images
> >>>>> > should
> >>>>> > also be accepted by the conversion routine. In that conversion
> >>>>> > function, and
> >>>>> > need to be able to put a switch on pixeltype and number of
> >>>>> > dimensions.
> >>>>> >
> >>>>> > Greetings,
> >>>>> > Lambert
> >>>>> >
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