[Insight-users] error C2440: 'initializing' : cannot convert from 'const itk::ImageRegion<VImageDimension>' to 'itk::ImageRegion<VImageDimension>'

[Dženan Zukić]

I am not at work so at the moment so I cannot check your code in a compiler.
However your first error is inability to convert const into non-const value
without using const_cast.

For the second error you did not copy-paste the rest of the error message,
namely the part "with TPixel=... and VImageDimension=...".

Anyway I attached a source code of slice extracting program, you might find
it useful.

HTH

On Mon, May 30, 2011 at 14:38, john smith <mkitkinsightuser at gmail.com>wrote:

> Hello, I have written the following code using ITK abd Qt. I am using
> reader as global variable:
>
>       typedef unsigned char        InputPixelType;
>   typedef itk::Image< InputPixelType,  3 >    InputImageType;
>   typedef itk::ImageFileReader< InputImageType  >  ReaderType;
>   ReaderType::Pointer reader = ReaderType::New();
>
> In my program I have two function. In the first, my program identifies the
> reader as global variable, but in the second I get these errors:
>
> *error C2440: 'initializing' : cannot convert from 'const
> itk::ImageRegion<VImageDimension>' to 'itk::ImageRegion<VImageDimension>'
> error C2664: 'void
> itk::ImageToImageFilter<TInputImage,TOutputImage>::SetInput(const
> itk::Image<TPixel,VImageDimension> *)' : cannot convert parameter 1 from
> 'itk::Image<TPixel,VImageDimension> *' to 'const
> itk::Image<TPixel,VImageDimension> *'*
>
> and this is the function:
>
>
> void MainWindow::z_slice_extract()
> {
>
>   typedef unsigned char        InputPixelType;
>   typedef unsigned char        OutputPixelType;
>
>   typedef itk::Image< InputPixelType,  3 >    InputImageType;
>   typedef itk::Image< OutputPixelType, 2 >    OutputImageType;
>
>   typedef itk::ImageFileReader< InputImageType  >  ReaderType;
>   typedef itk::ImageFileWriter< OutputImageType >  WriterType;
>
>   WriterType::Pointer writer = WriterType::New();
>
>   reader->SetFileName("C:/Users/manolis/Desktop/data/test.png");
>
>   writer->SetFileName( "2D.png" );
>
>
>   typedef itk::ExtractImageFilter< InputImageType, OutputImageType >
> FilterType;
>   FilterType::Pointer filter = FilterType::New();
>
>
>   InputImageType::RegionType inputRegion =
> reader->GetOutput()->GetLargestPossibleRegion();
>
>   InputImageType::SizeType size = inputRegion.GetSize();
>
>   // get the size of the hole 3D image
>   unsigned long size_x = size[0];
>   unsigned long size_y = size[1];
>   unsigned long size_z = size[2];
>
>   // get slices of z coordiante
>   size[2] = 0;
>
>
>   InputImageType::IndexType start = inputRegion.GetIndex();
>
>   ui->verticalScrollBar_z->setRange(1,size_z);
>   unsigned int sliceNumber  =  ui->verticalScrollBar_z->value();
>   start[2] = sliceNumber;
>
>
>
>   InputImageType::RegionType desiredRegion;
>   desiredRegion.SetSize( size );
>   desiredRegion.SetIndex( start );
>
>   filter->SetExtractionRegion( desiredRegion );
>
>   filter->SetInput( reader->GetOutput() );
>   writer->SetInput( filter->GetOutput() );
>
>       try
>     {
>     writer->Update();
>     }
>     catch( itk::ExceptionObject & err )
>     {
>     std::cerr << "ExceptionObject caught !" << std::endl;
>     std::cerr << err << std::endl;
>     }
>
>
>
>      static QGraphicsPixmapItem* pixmapItem;
>
>      if (!pixmapItem) {
>         //    pixmapItem = scene->addPixmap(QPixmap("2D.png"));
>
>           QPixmap tmpmap (QPixmap("2D.png"));
>         pixmapItem = scene->addPixmap ( tmpmap.scaled (214,256) );
>
>             ui->graphicsView_inputImage->setScene(scene);
>         } else {
>             QPixmap tmpmap (QPixmap("2D.png"));
>             pixmapItem->setPixmap(tmpmap.scaled ( 214,256));
>         }
>
>
>
>
>     // taking the size of the loaded image
>     ui->label_4->setText(QString("size x:%1").arg(size_x));
>     ui->label_5->setText(QString("size y:%1").arg(size_y));
>     ui->label_6->setText(QString("size z:%1").arg(size_z));
>
>     return;
> }
>
>
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