[ITK-users] How to determine PixelType of itk::Image

[Dženan Zukić]

If I remember correctly, using this
<http://www.vtk.org/Wiki/ITK/Examples/IO/ReadUnknownImageType> approach you
can also get number of components with something like:
imageIO->GetNumberOfComponents();
You can take a look at class documentation
<http://www.itk.org/Doxygen/html/classitk_1_1ImageIOBase.html> for more
details.

On Tue, Mar 15, 2016 at 1:09 PM, Lambert Zijp <ljzijp at gmail.com> wrote:

> I'm still not sure how to handle vector images. Dženan gave an example of
> an RGB image. That would be a 3-vector unsigned char pixeltype.
> Would I have to write out in those *'if  **(**typeid(ValueType) == ???)'*
> statements all permutations of the number of vectors and the type? Or is
> there a way to separate the number of vectors and the pixeltype?
> How are vector images stored in memory in ITK. In an RGB image for
> example, are the pixels consecutive triplets, or is the image stored as
> three consecutive color planes?
> I'm particular interested in 3D displacement vector fields, that are the
> result of deformable registration.
>
>
> On Tue, Mar 15, 2016 at 5:22 PM, Bill Lorensen <bill.lorensen at gmail.com>
> wrote:
>
>> This example may help
>> http://www.vtk.org/Wiki/ITK/Examples/IO/ReadUnknownImageType
>> On Mar 15, 2016 8:44 AM, "Dženan Zukić" <dzenanz at gmail.com> wrote:
>>
>>> Of course it complained, switch statement is for integral types (if I
>>> remember correctly).
>>>
>>> Regards
>>>
>>> On Tue, Mar 15, 2016 at 11:39 AM, Lambert Zijp <ljzijp at gmail.com> wrote:
>>>
>>>> Hi Dženan,
>>>>
>>>> Thank you very much!
>>>> Visual Studio 9 does not recognize decltype(), but typeid() worked
>>>> fine. At least, when you make separate if statements, like you did in your
>>>> example. When tried to use it in a switch statement, the compiler
>>>> complained.
>>>>
>>>> Greetings,
>>>> Lambert
>>>>
>>>>
>>>> On Tue, Mar 15, 2016 at 2:47 PM, Dženan Zukić <dzenanz at gmail.com>
>>>> wrote:
>>>>
>>>>> Hi Lambert,
>>>>>
>>>>> the classic way is using a bunch of if-else's.
>>>>>
>>>>> if (decltype(ValueType)==decltype(int))
>>>>> {
>>>>> //int specific processing
>>>>> }
>>>>> else if (decltype(ValueType)==decltype(itk::RGB<char>))
>>>>> {
>>>>> //RGB<char> specific processing
>>>>> }
>>>>> ​else if ...​
>>>>>
>>>>> ​If you can't use C++11's decltype then use typeid from <typeinfo>​
>>>>> header.
>>>>>
>>>>> Regards,
>>>>> Dženan
>>>>>
>>>>> On Tue, Mar 15, 2016 at 5:48 AM, Lambert Zijp <ljzijp at gmail.com>
>>>>> wrote:
>>>>>
>>>>>> I want to write a function that converts an arbitrary ITK image to
>>>>>> another format (AVS in my case).
>>>>>> It has been suggested that following functionprototype could de the
>>>>>> job:
>>>>>> template<typename ValueType,unsigned int Dimension>
>>>>>> int ItkToAvs(AVSfield** ppAvs, typename
>>>>>> itk::Image<ValueType,Dimension>::Pointer pItkImage);
>>>>>>
>>>>>> Now I want to know whether ValueType equals unsigned char or short or
>>>>>> int etc. Also whether the pixels are single numbers or vectors. How does
>>>>>> one do that?
>>>>>>
>>>>>> Greetings,
>>>>>> Lambert
>>>>>>
>>>>>>
>>>>>>
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>>>>>
>>>>
>>>
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