Hi Miri,
by removing the templating of the function you know which kind of data will be
used, but on the other hand it will now only work with that exact data type
given and no other. Which the compiler does try to tell you with that message.
I really do suggest taking the time to read up on templates. It is a rather
complex, but on the other hand very powerful tool that is used heavily by ITK
and other toolkits. Explaining this in an email might not quite be the right
medium, but there is excellent literature and tutorials out there, as people
often tend to struggle with the finer point of templates.
To give you a few pointers, you might want to look at:
Wiki on templates:
http://en.wikipedia.org/wiki/Template_%28programming%29
A longer tutorial on the subject:
http://www.iis.sinica.edu.tw/~kathy/vcstl/templates.htm
Short review by the ITK crew:
http://www.vialab.org/methods_course/Lectures/itk_lecture2_cppreview.ppt
(slide 22 and following)
Knowing how to use templates will save you a lot of work and time in the long
run.
Regards,
Caspar
Von: Miri Trope [mailto:[email protected]]
Gesendet: Freitag, 28. Oktober 2011 18:54
An: Goch, Caspar Jonas
Cc: mitk-users
Betreff: Re: [mitk-users] Changing image type
Thank you for your answer.
I took your advise and compiled:
void AddFilter(itk::Image <unsigned char, 3>* image, mitk::Image::Pointer
outputImage)
{...}
but I got some errors like this one:
..\..\..\..\MITK_myProjects\Modules\MyModuleLib\myFilter.cpp(78) : error C2664:
'AddFilter' : cannot convert parameter 1 from
'itk::Image<TPixel,VImageDimension> *' to 'itk::Image<TPixel,VImageDimension> *'
1> with
1> [
1> TPixel=int,
1> VImageDimension=2
1> ]
1> and
1> [
1> TPixel=unsigned char,
1> VImageDimension=3
1> ]
1> Types pointed to are unrelated; conversion requires reinterpret_cast,
C-style cast or function-style cast
On Fri, Oct 28, 2011 at 1:08 PM, Goch, Caspar Jonas
<[email protected]<mailto:[email protected]>> wrote:
Hi Miri,
I am not entirely sure, where you are trying to switch to a specific datatype,
but if you want to use it with a specific one you enter the datatype, just like
in itk::Image< float, 3 > for a three dimensional itk Image using floats. If
you are asking about defining the function for a specific datatype, you can
just get rid of the parameter and define it like
template< unsigned int VImageDimension>
void AddFilter(itk::Image<float, VImageDimension>* image, mitk::Image::Pointer
outputImage)
or even get rid of templating altogether
void AddFilter(itk::Image<float, 3>* image, mitk::Image::Pointer outputImage)
In any case, you might want to read further into the usage of templates as for
example here http://www.cplusplus.com/doc/tutorial/templates/ .
Regards,
Caspar
Von: Miri Trope [mailto:[email protected]<mailto:[email protected]>]
Gesendet: Freitag, 28. Oktober 2011 12:24
An: mitk-users
Betreff: [mitk-users] Changing image type
Hi All,
I have some questions:
1. The example of template on web (awesomeFilter) gets the image type as is by
typename
templaye<typename TPixel, unsigned int VImageDimension>
void AddFilter(itk::Image<TPixel, VImageDimension>* image, mitk::Image::Pointer
outputImage)
{...}
,thus if I want to change the image type, I need to use the filter:
itk::castingFilter. How can I get the image as any type that I want and avoid
the casting afterwards? My intuition is telling me that it should be something
like that:
typename<float TPixel, unsigned int VImageDimension>
but that returns errors...
2. It's really necessary to add the cpp files in the cmake file:
moduls\MyModuleLib\files.cmake like that:
set (CPP_FILES
myCppFile1.cpp
myCppFile2.cpp)
...
I think that when I don't add that, it doesn't matter the result.
Thanks!
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