[Insight-users] unexpectided error using extract image filter

[Dženan Zukić]

Your reader has TPixel=unsigned short and your filter has TPixel=unsigned
char. It has to be the same (both either char or short). Which compiler are
you using? VS2008 and VS2010 report these types in the error message.

HTH

On Tue, May 31, 2011 at 10:49, john smith <mkitkinsightuser at gmail.com>wrote:

> Hello, I am running the extract image filter, but I use two functions, one
> for loading the reader and one for use the ExtractImageFilter. The error and
> the cofe follows. I hope somebody could help me as I can't understand what
> is wrong. I also use Qt, but the problem I think in  ITK code.
>
> error (the error point is highlighted) :
>
> *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> *
>
> ////////// mainwindow.cpp //////////////////
> #include "mainwindow.h"
> #include "ui_mainwindow.h"
> #include "canvas.h"
>
> #include "itkImage.h"
> #include "itkImageFileReader.h"
> #include "itkImageFileWriter.h"
> #include "itkExtractImageFilter.h"
> #include <itkSize.h>
>
> QString fileName;
>
>   unsigned long size_x;
>   unsigned long size_y;
>   unsigned long size_z;
>
>
>       typedef unsigned short PixelType;
>      const unsigned int Dimension = 3;
>     typedef itk::Image< PixelType, Dimension > InputImageType;
>
>     typedef itk::ImageFileReader< InputImageType > ReaderType;
>     ReaderType::Pointer reader;
>
>
> MainWindow::MainWindow(QWidget *parent) :
>     QMainWindow(parent),
>     ui(new Ui::MainWindow)
> {
>     ui->setupUi(this);
>
>     ui->graphicsView_inputImage->setScene(scene=new Canvas());
>
>
> connect(scene,SIGNAL(mousejustpressed(int,int)),this,SLOT(mousejustpressed(int,int)));
>
>     QObject::connect(ui->pushButton_openFile, SIGNAL(clicked()), this,
> SLOT(push_button_File()));
>
>     QObject::connect(ui->pushButton_slice_z, SIGNAL(clicked()), this,
> SLOT(z_slice_extract()));
>
>     connect(ui->verticalScrollBar_z, SIGNAL(valueChanged()), this,
> SLOT(()));
>
>
>    typedef unsigned char        InputPixelType;
>   typedef itk::Image< InputPixelType,  3 >    InputImageType;
>   typedef itk::ImageFileReader< InputImageType  >  ReaderType;
>   ReaderType::Pointer reader = ReaderType::New();
> }
>
> void MainWindow::push_button_File()
> {
>
> ///unsigned char to display in .png format
>
>   reader->SetFileName("C:/Users/......../test.png");
>   reader->Update();
> }
>
>
> void MainWindow::z_slice_extract()
> {
>
>
> ///unsigned char to display in .png format
>   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();
>
>   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;
>     }
>
>
>      scene->addPixmap(QPixmap("2D.png"));
>           ui->graphicsView_inputImage->setScene(scene);
>
>
>
>     // 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;
> }
>
>
>
>
>
> void MainWindow::mousejustpressed(int x,int y)
> {
>     int k1=256-y;
>
>
>     unsigned char value;
>
>     QImage image(scene->sceneRect().size().toSize(),
>     QImage::Format_RGB32);
>
>     QPainter painter(&image);
>     scene->render(&painter);
>
>     value=image.pixel(x,k1);
>
>
>     /**QImage buffer = QImage(1,1, QImage::Format_RGB32);
>     QPainter painter(&buffer);
>     scene->render(&painter, QRectF(0.0, 0.0, 1.0, 1.0), QRectF(x, y, 1.0,
> 1.0));
>     int value = qGray(buffer.pixel(0,0));
>     */
>
>     ui->label->setText(QString("x:%1").arg(x));
>     ui->label_2->setText(QString("y:%1").arg(k1));
>     ui->label_3->setText(QString("pixel value:%1").arg(value));
>
>
> }
>
>
> MainWindow::~MainWindow()
> {
>     delete ui;
> }
>
>
>
> ////////////////// mainwindow.h //////////////
> #ifndef MAINWINDOW_H
> #define MAINWINDOW_H
>
> #include <QMainWindow>
> #include <QGraphicsScene>
> #include "canvas.h"
>
> #include "itkImage.h"
> #include "itkImageFileReader.h"
>
> #include <qstring.h>
> #include <qdir.h>
> #include <qfiledialog.h>
> #include <qmessagebox.h>
> #include <qlabel.h>
> #include <qgraphicsScene.h>
>
> #include <QGraphicsPixmapItem>
>
>
>
>
> namespace Ui {
>     class MainWindow;
> }
>
> class MainWindow : public QMainWindow
> {
>     Q_OBJECT
>
>      Canvas *scene;
>
>
> public:
>     explicit MainWindow(QWidget *parent = 0);
>     ~MainWindow();
>
> private:
>     Ui::MainWindow *ui;
>
>     public slots:
>     void mousejustpressed(int x,int y);
>
>         public slots:
>         void push_button_File();
>         void z_slice_extract();
>
>
> };
>
> #endif // MAINWINDOW_H
>
>
>
>
>
>
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