[Insight-users] unexpectided error using extract image filter

[john smith]

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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