[vtkusers] Iterate over an image

[Francisco Lopez de la Franca]

Sorry for the annoyances, but I've tested again my code (with pixel type to
unsigned char) against another image with a few pixels with value 1 and it
does not detect anyone.

However, in ITK, either with unsigned char or int, it always detects all
the points to 1.

Thanks.

2015-06-24 13:04 GMT+02:00 Francisco Lopez de la Franca <
franciscolopezdelafranca at gmail.com>:

> Hi again,
> I answer to myself in case it can help someone someday.
> I've changed the voxel type to unsigned char and it works as expected,
> that is, instead of "int* voxel", I've changed it to "unsigned char*
> voxel". Only with this little change it works right.
> Greetings.
>
> 2015-06-24 12:22 GMT+02:00 Francisco Lopez de la Franca <
> franciscolopezdelafranca at gmail.com>:
>
>> Hi everybody,
>> I've got a 3D image in NIFTI format. It is a binary image with 0 values
>> for background and 1 values for objects.
>>
>>
>> I've coded a function to count the number of 1's in the image in the
>> following way:
>>
>> int* dims = _imageData->GetDimensions();
>>
>>     int count= 0;
>>     int * voxel;
>>     for (int z = 0; z < dims[2]; z++)
>>     {
>>         for (int y = 0; y < dims[1]; y++)
>>         {
>>             for (int x = 0; x < dims[0]; x++)
>>             {
>>                 voxel =
>> static_cast<int*>(_imageData->GetScalarPointer(x,y,z));
>>
>>                 if ( voxel[0] == 1 ) {
>>                     count++;
>>                 }
>>             }
>>         }
>>     }
>>
>> However, this function does not detect any 1 in the image.
>>
>> I've implemented another function in ITK, by using ITK image iterators,
>> and the result is the expected. It detects hundreds of voxels with value 1
>> (also checked with the 3D Slicer tool).
>>
>> Does anyone know what the problem could be in my VTK code? Does VTK
>> provide iterators like ITK does?
>>
>> Thank you very much.
>> My best regards.
>> /Francisco
>>
>
>
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