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

Timothee Evain tevain at telecom-paristech.fr
Fri Mar 11 05:35:53 EST 2016 

Hello Lambert,

Try something like this :

template<typename ValueType,unsigned int Dimension>
extern int ItkToAvs(AVSfield** ppAvs, typename itk::Image<ValueType,Dimension>::Pointer InputImage);

This way you should be able to use the function for any itkImage type, given that you provide the ValueType and the Dimension to the function at compile time like :

[...]=ItkToAvs<ValueType,Dimension>([...]);

But I cannot guarantee that this is the best way to do it, since I'm quite a beginner with templates.

HTH,

Tim

----- Mail original -----
De: "Lambert Zijp" <ljzijp at gmail.com>
À: "Matt McCormick" <matt.mccormick at kitware.com>
Cc: insight-users at itk.org
Envoyé: Jeudi 10 Mars 2016 18:06:35
Objet: Re: [ITK] [ITK-users] Conversion of itk::Image to other formats

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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>>>>> Visit other Kitware open-source projects at 
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>>>>> Kitware offers ITK Training Courses, for more information visit: 
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>>>> 
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