ITK/Examples/ItkVtkGlue/itkImageToVTKImageFilter: Difference between revisions

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Many of the ITK examples use VTK to display the results. The files on this page provide a simple interface between ITK and VTK.
Many of the ITK examples use VTK to display the results. The files on this page provide a simple interface between ITK and VTK.


'''NOTE:''' If you download the entire ITK Wiki Examples Collection,, the ItkVtkGlue directory will be included. If you wish to just build a few examples, then you will need to [http://gitorious.org/itkwikiexamples/itkwikiexamples/blobs/raw/5bbbadd7f90f5009798c012b6fa57379d3aeebcb/ItkVtkGlue.tar.gz download ItkVtkGlue] and build it.
'''NOTE:''' If you download the entire ITK Wiki Examples Collection,, the ItkVtkGlue directory will be included. If you wish to just build a few examples, then you will need to [http://gitorious.org/itkwikiexamples/itkwikiexamples/blobs/raw/master/ItkVtkGlue.tar.gz download ItkVtkGlue] and build it.
==itkImageToVTKImageFilter.h==
==itkImageToVTKImageFilter.h==
<source lang=cpp>
<source lang=cpp>
Line 44: Line 44:
  */
  */
template <class TInputImage >
template <class TInputImage >
class ITK_EXPORT ImageToVTKImageFilter : public ProcessObject
class ImageToVTKImageFilter : public ProcessObject
{
{
public:
public:
Line 71: Line 71:


   /** Set the input in the form of an itk::Image */
   /** Set the input in the form of an itk::Image */
  using Superclass::SetInput;
   void SetInput( const InputImageType * );
   void SetInput( const InputImageType * );


Line 234: Line 235:
==QuickView.h==
==QuickView.h==
<source lang="cpp">
<source lang="cpp">
#ifndef QuickView_H
/*=========================================================================
#define QuickView_H
*
*  Copyright Insight Software Consortium
*
*  Licensed under the Apache License, Version 2.0 (the "License");
*  you may not use this file except in compliance with the License.
*  You may obtain a copy of the License at
*
*        http://www.apache.org/licenses/LICENSE-2.0.txt
*
*  Unless required by applicable law or agreed to in writing, software
*  distributed under the License is distributed on an "AS IS" BASIS,
*  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*  See the License for the specific language governing permissions and
*  limitations under the License.
*
*=========================================================================*/
#ifndef QuickView_h
#define QuickView_h


#include <vector>
#include <vector>
#include <algorithm>
#include <string>


#include <itkImage.h>
#include <itkImage.h>
#include <itkRGBPixel.h>
#include <itkIntTypes.h>


class QuickView
/** \class ImageInfo
* \brief A container for an image and its descriptiom
* \ingroup ITKVtkGlue
*/
class  ImageInfo
{
{
public:
  typedef itk::Image<unsigned char, 2> ImageType;
  ImageInfo(ImageType *image, std::string description="")
  {
    m_Image = image;
    m_Description = description;
  }
  ImageType::Pointer m_Image;
  std::string        m_Description;
};


/** \class RGBImageInfo
* \brief A container for an rgb image and its descriptiom
* \ingroup ITKVtkGlue
*/
class  RGBImageInfo
{
public:
public:
   template<class TImage> void AddImage(TImage *, bool FlipVertical=true);
  typedef itk::Image<itk::RGBPixel<unsigned char>, 2> ImageType;
   void Visualize();
  RGBImageInfo(ImageType *image, std::string description="")
  {
    m_Image = image;
    m_Description = description;
  }
 
  ImageType::Pointer m_Image;
  std::string        m_Description;
};
 
/** \class QuickView
* \brief A convenient class to render itk images with vtk
*
* This class presents a convenient and efficient mechanism to display
* ITK images in VTK render windows.
*
* The AddImage and AddRGBImage methods collect ITK images to be
* rendered in a collection of VTK RenderWindow's. Each image can
* be flipped about the vertical axis. An optional description will be
* displayed at the bottom of each render window.
*
* If m_ShareCamera is true, a single <a href="http://www.vtk.org/doc/nightly/html/classvtkCamera.html">vtkCamera</a>
* will be used for each render window (default is false).
*
* Each image is rescaled to have a range between 0 and 255. Currently, the size
* of each render window is fixed at 300,300 and the text size for descriptions
* is fixed at 10.
*
* The Visualize method displays the render windows and starts a
* <a href="http://www.vtk.org/doc/nightly/html/classvtkInteractorStyleImage.html">vtkInteractorStyleImage</a>.
* The layout and background color of each render window is fixed. The optional
* boolean for the constructor, if false, bypasses the interactor. This is useful
* for running tests.
*
* Typical usage:
*
* \code
*  QuickView viewer;
*  viewer.AddImage(someFilter->GetOutput().
*                  true (to flip image) or false.
*                  "text to display with the image");
*
*  viewer.AddRGBImage(someFilter->GetOutput().
*                    true (to flip image) or false.
*                    "text to display with the image");
*  \endcode
*
* \ingroup ITKVtkGlue
*/
class  QuickView
{
public:
  QuickView()
  {
    m_ShareCamera = true;
    m_Interpolate = true;
    m_Counter = 0;
    m_Snapshot = false;
    m_SnapshotPath = "";
    m_SnapshotPrefix = "snapshot_";
    m_SnapshotExtension = "png";
    m_NumberOfColumns = 4;
    m_ViewPortSize = 300;
  }
  /** Add an image to be rendered. */
   template<typename TImage> void AddImage(
    TImage *,
    bool FlipVertical=true,
    std::string Description="");
 
  /** Add an RGB image to be rendered */
  template<typename TImage> void AddRGBImage(
    TImage *,
    bool FlipVertical=true,
    std::string Description="");
 
  /** Render the images. If interact is tru, start a vtk
  * Interactor. If false, return after one render.
  */
   void Visualize(bool interact=true);
 
 
  /** Each render window will have its own camera */
  void ShareCameraOff()
  {
    m_ShareCamera = false;
  }
 
  /** Each render window will use the same camera */
  void ShareCameraOn()
  {
    m_ShareCamera = true;
  }
 
  /** Use pixel replication in rendered image */
  void InterpolateOff()
  {
    m_Interpolate = false;
  }
 
  /** Use pixel interpolation in rendered image */
  void InterpolateOn()
  {
    m_Interpolate = true;
  }
 
  /** Each render window will take a snaphot */
  void SnapshotOn()
  {
    m_Snapshot = true;
  }
 
  /** Each render window will take a snaphot */
  void SnapshotOff()
  {
    m_Snapshot = false;
  }
 
  void SetSnapshotPath( const std::string& iPath )
  {
    m_SnapshotPath = iPath;
  }
 
  void SetSnapshotPrefix( const std::string& iPrefix )
  {
    m_SnapshotPrefix = iPrefix;
  }
 
  /** Provide the image format to be used when taking snapshot */
  void SetSnapshotExtension( const std::string& iExtension )
  {
    m_SnapshotExtension = iExtension;
    std::transform(
          m_SnapshotExtension.begin(),
          m_SnapshotExtension.end(),
          m_SnapshotExtension.begin(),
          ::tolower );
  }
 
  /** Set the number of columns, default 4.*/
  void SetNumberOfColumns (const unsigned int columns)
  {
    m_NumberOfColumns = columns;
  }
 
  /** Set the viewport size, default 300.*/
  void SetViewPortSize (const unsigned int size)
  {
    m_ViewPortSize = size;
  }


private:
private:
   std::vector<itk::Image<unsigned char, 2>::Pointer > Images;
   std::vector<ImageInfo>    Images;        // Container for images
  std::vector<RGBImageInfo> RGBImages;    // Container for rgb images
  itk::IdentifierType      m_Counter;
  std::string              m_SnapshotPath;
  std::string              m_SnapshotPrefix;
  std::string              m_SnapshotExtension;
  bool                      m_ShareCamera;
  bool                      m_Snapshot;
  bool                      m_Interpolate;
  unsigned int              m_NumberOfColumns;
  unsigned int              m_ViewPortSize;
};
};


Line 257: Line 460:
==QuickView.cxx==
==QuickView.cxx==
<source lang="cpp">
<source lang="cpp">
/*=========================================================================
*
*  Copyright Insight Software Consortium
*
*  Licensed under the Apache License, Version 2.0 (the "License");
*  you may not use this file except in compliance with the License.
*  You may obtain a copy of the License at
*
*        http://www.apache.org/licenses/LICENSE-2.0.txt
*
*  Unless required by applicable law or agreed to in writing, software
*  distributed under the License is distributed on an "AS IS" BASIS,
*  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*  See the License for the specific language governing permissions and
*  limitations under the License.
*
*=========================================================================*/
#include "QuickView.h"
#include "QuickView.h"


#include "itkImage.h"
#include "itkRescaleIntensityImageFilter.h"
#include "itkRescaleIntensityImageFilter.h"
#include "itkVectorRescaleIntensityImageFilter.h"
#include "itkRGBToVectorImageAdaptor.h"
#include "itkFlipImageFilter.h"
#include "itkFlipImageFilter.h"


#include "vtkImageViewer.h"
#include "vtkVersion.h"
 
#include "vtkRenderWindowInteractor.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkSmartPointer.h"
#include "vtkImageMapper3D.h"
#include "vtkImageActor.h"
#include "vtkImageActor.h"
#include "vtkActor2D.h"
#include "vtkInteractorStyleImage.h"
#include "vtkInteractorStyleImage.h"
#include "vtkRenderer.h"
#include "vtkRenderer.h"
#include "vtkCamera.h"
#include "vtkCamera.h"
#include "vtkTextProperty.h"
#include "vtkTextMapper.h"
#include "vtkCaptureScreen.h"
#include "vtkPNGWriter.h"
#include "vtkJPEGWriter.h"
#include "vtkBMPWriter.h"
#include "vtkTIFFWriter.h"


#include "itkImageToVTKImageFilter.h"
#include "itkImageToVTKImageFilter.h"
#include <algorithm>
 
 
typedef itk::Image<itk::RGBPixel<unsigned char>, 2>  UnsignedCharRGBImageType;
typedef itk::Image<itk::RGBPixel<float>, 2>         FloatRGBImageType;


typedef itk::Image<unsigned char, 2>  UnsignedCharImageType;
typedef itk::Image<unsigned char, 2>  UnsignedCharImageType;
Line 285: Line 519:
typedef itk::Image<double, 2>          DoubleImageType;
typedef itk::Image<double, 2>          DoubleImageType;


template void QuickView::AddImage<CharImageType>(CharImageType *image, bool FlipVertical);
template void QuickView::AddImage<CharImageType>(
template void QuickView::AddImage<UnsignedShortImageType>(UnsignedShortImageType *image, bool FlipVertical);
  CharImageType *image,
template void QuickView::AddImage<ShortImageType>(ShortImageType *image, bool FlipVertical);
  bool FlipVertical,
template void QuickView::AddImage<UnsignedIntImageType>(UnsignedIntImageType *image, bool FlipVertical);
  std::string Description);
template void QuickView::AddImage<IntImageType>(IntImageType *image, bool FlipVertical);
template void QuickView::AddImage<UnsignedShortImageType>(
template void QuickView::AddImage<UnsignedLongImageType>(UnsignedLongImageType *image, bool FlipVertical);
  UnsignedShortImageType *image,
template void QuickView::AddImage<LongImageType>(LongImageType *image, bool FlipVertical);
  bool FlipVertical,
template void QuickView::AddImage<FloatImageType>(FloatImageType *image, bool FlipVertical);
  std::string Description);
template void QuickView::AddImage<DoubleImageType>(DoubleImageType *image, bool FlipVertical);
template void QuickView::AddImage<ShortImageType>(
  ShortImageType *image,
  bool FlipVertical,
  std::string Description);
template void QuickView::AddImage<UnsignedIntImageType>(
  UnsignedIntImageType *image,
  bool FlipVertical,
  std::string Description);
template void QuickView::AddImage<IntImageType>(
  IntImageType *image,
  bool FlipVertical,
  std::string Description);
template void QuickView::AddImage<UnsignedLongImageType>(
  UnsignedLongImageType *image,
  bool FlipVertical,
  std::string Description);
template void QuickView::AddImage<LongImageType>(
  LongImageType *image,
  bool FlipVertical,
  std::string Description);
template void QuickView::AddImage<FloatImageType>(
  FloatImageType *image,
  bool FlipVertical,
  std::string Description);
template void QuickView::AddImage<DoubleImageType>(
  DoubleImageType *image,
  bool FlipVertical,
  std::string Description);


template< >
template< >
void QuickView::AddImage<UnsignedCharImageType>(UnsignedCharImageType *image, bool FlipVertical)
void QuickView::AddImage<UnsignedCharImageType>(
  UnsignedCharImageType *image,
  bool FlipVertical,
  std::string Description)
{
{
   if (FlipVertical)
   if (FlipVertical)
Line 307: Line 571:
     flipper->SetInput(image);
     flipper->SetInput(image);
     flipper->Update();
     flipper->Update();
     this->Images.push_back(flipper->GetOutput());
    ImageInfo myImage(flipper->GetOutput(), Description);
     this->Images.push_back(myImage);
     }
     }
   else
   else
     {
     {
     this->Images.push_back(image);
    ImageInfo myImage(image, Description);
     this->Images.push_back(myImage);
     }
     }
}
}


template<class TImage>
template<typename TImage>
void QuickView::AddImage(TImage *image, bool FlipVertical)
void QuickView::AddImage(
  TImage *image,
  bool FlipVertical,
  std::string Description)
{
{
   typedef itk::RescaleIntensityImageFilter<TImage, UnsignedCharImageType > rescaleFilterType;
   typedef itk::RescaleIntensityImageFilter<TImage, UnsignedCharImageType >
    rescaleFilterType;


   typename rescaleFilterType::Pointer rescaler = rescaleFilterType::New();
   typename rescaleFilterType::Pointer rescaler = rescaleFilterType::New();
Line 325: Line 595:
   rescaler->SetInput(image);
   rescaler->SetInput(image);
   rescaler->Update();
   rescaler->Update();
 
 
   this->AddImage(rescaler->GetOutput(), FlipVertical);
   this->AddImage(rescaler->GetOutput(), FlipVertical, Description);
}
}


void QuickView::Visualize()
template< >
void QuickView::AddImage<UnsignedCharRGBImageType>(
  UnsignedCharRGBImageType *image,
  bool FlipVertical,
  std::string Description)
{
{
   // Setup the render window
  if (FlipVertical)
    {
    typedef itk::FlipImageFilter< UnsignedCharRGBImageType> FlipFilterType;
    FlipFilterType::Pointer flipper = FlipFilterType::New();
    bool flipAxes[3] = { false, true, false };
    flipper = FlipFilterType::New();
    flipper->SetFlipAxes(flipAxes);
    flipper->SetInput(image);
    flipper->Update();
    RGBImageInfo myImage(flipper->GetOutput(), Description);
    this->RGBImages.push_back(myImage);
    }
  else
    {
    RGBImageInfo myImage(image, Description);
    this->RGBImages.push_back(myImage);
    }
}
 
template< >
void QuickView::AddRGBImage<UnsignedCharRGBImageType>(
  UnsignedCharRGBImageType *image,
  bool FlipVertical,
  std::string Description)
{
  if (FlipVertical)
    {
    typedef itk::FlipImageFilter< UnsignedCharRGBImageType> FlipFilterType;
    FlipFilterType::Pointer flipper = FlipFilterType::New();
    bool flipAxes[3] = { false, true, false };
    flipper = FlipFilterType::New();
    flipper->SetFlipAxes(flipAxes);
    flipper->SetInput(image);
    flipper->Update();
    RGBImageInfo myImage(flipper->GetOutput(), Description);
    this->RGBImages.push_back(myImage);
    }
  else
    {
    RGBImageInfo myImage(image, Description);
    this->RGBImages.push_back(myImage);
    }
}
 
template< >
void QuickView::AddRGBImage<FloatRGBImageType>(
  FloatRGBImageType *image,
  bool FlipVertical,
  std::string Description)
{
  typedef itk::RGBToVectorImageAdaptor<FloatRGBImageType> AdaptorType;
  AdaptorType::Pointer adaptor = AdaptorType::New();
  adaptor->SetImage(image);
 
  typedef itk::VectorRescaleIntensityImageFilter<AdaptorType, UnsignedCharRGBImageType > rescaleFilterType;
  rescaleFilterType::Pointer rescaler = rescaleFilterType::New();
  rescaler->SetOutputMaximumMagnitude(255);
  rescaler->SetInput(adaptor);
  rescaler->Update();
  this->AddRGBImage(rescaler->GetOutput(), FlipVertical, Description);
}
 
template< >
void QuickView::AddImage<FloatRGBImageType>(
  FloatRGBImageType *image,
  bool FlipVertical,
  std::string Description)
{
  typedef itk::RGBToVectorImageAdaptor<FloatRGBImageType> AdaptorType;
  AdaptorType::Pointer adaptor = AdaptorType::New();
  adaptor->SetImage(image);
 
  typedef itk::VectorRescaleIntensityImageFilter<AdaptorType, UnsignedCharRGBImageType > rescaleFilterType;
  rescaleFilterType::Pointer rescaler = rescaleFilterType::New();
  rescaler->SetOutputMaximumMagnitude(255);
  rescaler->SetInput(adaptor);
  rescaler->Update();
  this->AddRGBImage(rescaler->GetOutput(), FlipVertical, Description);
}
 
void QuickView::Visualize(bool interact)
{
  unsigned int rendererSize = this->m_ViewPortSize;
  unsigned int numberOfImages = this->Images.size() + this->RGBImages.size();
  unsigned int numberOfRows = (numberOfImages - 1) / this->m_NumberOfColumns + 1;
  unsigned int numberOfColumns = numberOfImages / (numberOfRows) + 1;
  if (numberOfColumns > numberOfImages)
    {
    numberOfColumns = numberOfImages;
    }
 
   // Setup the render window and interactor
   vtkSmartPointer<vtkRenderWindow> renderWindow =
   vtkSmartPointer<vtkRenderWindow> renderWindow =
     vtkSmartPointer<vtkRenderWindow>::New();
     vtkSmartPointer<vtkRenderWindow>::New();
  unsigned int rendererSize = 300;
   renderWindow->SetSize(rendererSize * numberOfColumns,
   renderWindow->SetSize(rendererSize * this->Images.size(), rendererSize);
                        rendererSize * numberOfRows);


   vtkSmartPointer<vtkRenderWindowInteractor> interactor =
   vtkSmartPointer<vtkRenderWindowInteractor> interactor =
Line 342: Line 707:


   // Render all of the images
   // Render all of the images
  double step = 1./(static_cast<double>(this->Images.size()));
   std::vector<double*> viewports;
   std::vector<double*> viewports;


   typedef itk::ImageToVTKImageFilter<itk::Image<unsigned char, 2> > ConnectorType;
   typedef itk::ImageToVTKImageFilter<itk::Image<unsigned char, 2> >
   std::vector<ConnectorType::Pointer> connectors; // Force the connectors to persist (not lose scope) after each iteration of the loop
    ConnectorType;
  typedef itk::ImageToVTKImageFilter<itk::Image<itk::RGBPixel<unsigned char>, 2> >
    RGBConnectorType;
   std::vector<ConnectorType::Pointer>   connectors; // Force the connectors to persist (not lose scope) after each iteration of the loop
  std::vector<RGBConnectorType::Pointer> RGBconnectors; // Force the connectors to persist after each iteration of the loop


   double background[6] = {.4, .5, .6, .6, .5, .4};
   double background[6] = {.4, .5, .6, .6, .5, .4};


   vtkSmartPointer<vtkCamera> camera =  
   vtkSmartPointer<vtkCamera> sharedCamera =
     vtkSmartPointer<vtkCamera>::New();
     vtkSmartPointer<vtkCamera>::New();
   for(unsigned int i = 0; i < this->Images.size(); i++)
 
   for(unsigned int row = 0; row < numberOfRows; ++row)
     {
     {
     ConnectorType::Pointer connector = ConnectorType::New();
     for(unsigned int col = 0; col < numberOfColumns; ++col)
    connectors.push_back(connector);
      {
    connector->SetInput(this->Images[i]);
      size_t i = row * numberOfColumns + col;
 
      // (xmin, ymin, xmax, ymax)
    // (xmin, ymin, xmax, ymax)
      double viewport[4] =
    double viewport[4] = {static_cast<double>(i)*step, 0.0, static_cast<double>(i+1)*step, 1.0};
        {static_cast<double>(col) * rendererSize / (numberOfColumns * rendererSize),
    viewports.push_back(viewport);
        static_cast<double>(numberOfRows - (row+1)) * rendererSize / (numberOfRows * rendererSize),
    vtkSmartPointer<vtkImageActor> actor =
        static_cast<double>(col+1)*rendererSize / (numberOfColumns * rendererSize),
      vtkSmartPointer<vtkImageActor>::New();
        static_cast<double>(numberOfRows - row) * rendererSize / (numberOfRows * rendererSize)};
    actor->SetInput(connector->GetOutput());
      viewports.push_back(viewport);


    // Setup renderer
      // Grayscale images
    vtkSmartPointer<vtkRenderer> renderer =
      if (i < this->Images.size())
      vtkSmartPointer<vtkRenderer>::New();
        {
    renderWindow->AddRenderer(renderer);
        ConnectorType::Pointer connector = ConnectorType::New();
    renderer->SetViewport(viewports[i]);
        connectors.push_back(connector);
    renderer->SetBackground(background);
        connector->SetInput(this->Images[i].m_Image);
    renderer->SetActiveCamera(camera);
    std::rotate(background, background + 1, background + 6);


    renderer->AddActor(actor);
        vtkSmartPointer<vtkImageActor> actor =
    renderer->ResetCamera();
          vtkSmartPointer<vtkImageActor>::New();
#if VTK_MAJOR_VERSION <= 5
        actor->SetInput(connector->GetOutput());
#else
        connector->Update();
        actor->GetMapper()->SetInputData(connector->GetOutput());
#endif
 
        // Setup renderer
        vtkSmartPointer<vtkRenderer> renderer =
          vtkSmartPointer<vtkRenderer>::New();
        renderWindow->AddRenderer(renderer);
        renderer->SetViewport(viewports[i]);
        renderer->SetBackground(background);
        if (m_ShareCamera)
          {
          renderer->SetActiveCamera(sharedCamera);
          }
        else
          {
          vtkSmartPointer<vtkCamera> aCamera =
            vtkSmartPointer<vtkCamera>::New();
          renderer->SetActiveCamera(aCamera);
          }
        std::rotate(background, background + 1, background + 6);
 
        if (this->Images[i].m_Description != "")
          {
          vtkSmartPointer<vtkTextProperty> textProperty =
            vtkSmartPointer<vtkTextProperty>::New();
          textProperty->SetFontSize(10);
          textProperty->SetFontFamilyToCourier();
          textProperty->SetJustificationToCentered();
 
          vtkSmartPointer<vtkTextMapper> textMapper =
            vtkSmartPointer<vtkTextMapper>::New();
          textMapper->SetTextProperty(textProperty);
          textMapper->SetInput(this->Images[i].m_Description.c_str());
 
          vtkSmartPointer<vtkActor2D> textActor =
            vtkSmartPointer<vtkActor2D>::New();
          textActor->SetMapper(textMapper);
          textActor->SetPosition(rendererSize/2, 16);
          renderer->AddActor(textActor);
          }
        if (m_Interpolate)
          {
          actor->InterpolateOn();
          }
        else
          {
          actor->InterpolateOff();
          }
        renderer->AddActor(actor);
        renderer->ResetCamera();
        }
      // RGB Images
      else if (i >= this->Images.size() && i < numberOfImages)
        {
        unsigned int j = row * numberOfColumns + col - this->Images.size();
        RGBConnectorType::Pointer connector = RGBConnectorType::New();
        RGBconnectors.push_back(connector);
        connector->SetInput(this->RGBImages[j].m_Image);
 
        vtkSmartPointer<vtkImageActor> actor =
          vtkSmartPointer<vtkImageActor>::New();
#if VTK_MAJOR_VERSION <= 5
        actor->SetInput(connector->GetOutput());
#else
        connector->Update();
        actor->GetMapper()->SetInputData(connector->GetOutput());
#endif
 
        // Setup renderer
        vtkSmartPointer<vtkRenderer> renderer =
          vtkSmartPointer<vtkRenderer>::New();
        renderWindow->AddRenderer(renderer);
        renderer->SetViewport(viewports[i]);
        renderer->SetBackground(background);
        if (m_ShareCamera)
          {
          renderer->SetActiveCamera(sharedCamera);
          }
        else
          {
          vtkSmartPointer<vtkCamera> aCamera =
            vtkSmartPointer<vtkCamera>::New();
          renderer->SetActiveCamera(aCamera);
          }
        std::rotate(background, background + 1, background + 6);
 
        if (this->RGBImages[j].m_Description != "")
          {
          vtkSmartPointer<vtkTextProperty> textProperty =
            vtkSmartPointer<vtkTextProperty>::New();
          textProperty->SetFontSize(10);
          textProperty->SetFontFamilyToCourier();
          textProperty->SetJustificationToCentered();
 
          vtkSmartPointer<vtkTextMapper> textMapper =
            vtkSmartPointer<vtkTextMapper>::New();
          textMapper->SetTextProperty(textProperty);
          textMapper->SetInput(this->RGBImages[j].m_Description.c_str());
 
          vtkSmartPointer<vtkActor2D> textActor =
            vtkSmartPointer<vtkActor2D>::New();
          textActor->SetMapper(textMapper);
          textActor->SetPosition(rendererSize/2, 16);
          renderer->AddActor(textActor);
          }
 
        if (m_Interpolate)
          {
          actor->InterpolateOn();
          }
        else
          {
          actor->InterpolateOff();
          }
        renderer->AddActor(actor);
        renderer->ResetCamera();
        }
      else
        {
        // Fill empty viewports
        vtkSmartPointer<vtkRenderer> renderer =
          vtkSmartPointer<vtkRenderer>::New();
        renderWindow->AddRenderer(renderer);
        renderer->SetViewport(viewports[i]);
        renderer->SetBackground(background);
        continue;
        }
      }
     }
     }
    renderWindow->Render();
    if( m_Snapshot )
    {
    std::string filename;
    std::stringstream temp;
    temp << m_SnapshotPath << m_SnapshotPrefix << m_Counter << ".";
    filename = temp.str();
    filename.append( m_SnapshotExtension );


  renderWindow->Render();
    if( m_SnapshotExtension == "png" )
      {
      vtkCaptureScreen< vtkPNGWriter > capture( renderWindow );
      capture( filename );
      }
    if( ( m_SnapshotExtension == "jpg" ) || ( m_SnapshotExtension == "jpeg" ) )
      {
      vtkCaptureScreen< vtkJPEGWriter > capture( renderWindow );
      capture( filename );
      }
    if( m_SnapshotExtension == "bmp" )
      {
      vtkCaptureScreen< vtkBMPWriter > capture( renderWindow );
      capture( filename );
      }
    if( ( m_SnapshotExtension == "tif" ) || ( m_SnapshotExtension == "tiff" ) )
      {
      vtkCaptureScreen< vtkTIFFWriter > capture( renderWindow );
      capture( filename );
      }
    m_Counter++;
    }


   vtkSmartPointer<vtkInteractorStyleImage> style =
   vtkSmartPointer<vtkInteractorStyleImage> style =
     vtkSmartPointer<vtkInteractorStyleImage>::New();
     vtkSmartPointer<vtkInteractorStyleImage>::New();
   interactor->SetInteractorStyle(style);
   interactor->SetInteractorStyle(style);
   interactor->Start();
 
   if (interact)
    {
    interactor->Start();
    }
}
}
</source>
==vtkCaptureScreen.h==
<source lang="cpp">
/*=========================================================================
*
*  Copyright Insight Software Consortium
*
*  Licensed under the Apache License, Version 2.0 (the "License");
*  you may not use this file except in compliance with the License.
*  You may obtain a copy of the License at
*
*        http://www.apache.org/licenses/LICENSE-2.0.txt
*
*  Unless required by applicable law or agreed to in writing, software
*  distributed under the License is distributed on an "AS IS" BASIS,
*  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*  See the License for the specific language governing permissions and
*  limitations under the License.
*
*=========================================================================*/
#ifndef __vtkCaptureScreen_h
#define __vtkCaptureScreen_h
#include <string>
#include "vtkSmartPointer.h"
#include "vtkWindowToImageFilter.h"
#include "vtkRenderWindow.h"
template < class TImageWriter >
class vtkCaptureScreen
  {
public:
  typedef TImageWriter ImageWriterType;
  vtkCaptureScreen( vtkRenderWindow* iRenderer ) : m_Renderer ( iRenderer )
    {}
  vtkCaptureScreen() : m_Renderer( NULL )
    {}
  ~vtkCaptureScreen( )
    {}
  void operator( ) ( const std::string& iFileName ) const
    {
    Capture( m_Renderer, iFileName );
    }
  void operator( ) ( vtkRenderWindow* iRenderer,
                    const std::string& iFileName ) const
    {
    m_Renderer = iRenderer;
    Capture( m_Renderer, iFileName );
    }
  private:
    vtkCaptureScreen ( const vtkCaptureScreen& );
    void operator = ( const vtkCaptureScreen& );
    vtkRenderWindow* m_Renderer;
    void Capture( vtkRenderWindow* iRenderer,
                  const std::string& iFileName ) const
      {
      if( iRenderer )
        {
        vtkSmartPointer< vtkWindowToImageFilter > Dumper =
            vtkSmartPointer< vtkWindowToImageFilter >::New( );
        Dumper->SetInput( iRenderer );
        Dumper->Update( );
        vtkSmartPointer< ImageWriterType > writer =
            vtkSmartPointer< ImageWriterType >::New( );
        writer->SetFileName ( iFileName.c_str( ) );
        writer->SetInputConnection ( Dumper->GetOutputPort( ) );
        writer->Write( );
        }
      }
  };
#endif
</source>
</source>

Latest revision as of 15:58, 30 September 2015

Many of the ITK examples use VTK to display the results. The files on this page provide a simple interface between ITK and VTK.

NOTE: If you download the entire ITK Wiki Examples Collection,, the ItkVtkGlue directory will be included. If you wish to just build a few examples, then you will need to download ItkVtkGlue and build it.

itkImageToVTKImageFilter.h

<source lang=cpp> /*=========================================================================

*
*  Copyright Insight Software Consortium
*
*  Licensed under the Apache License, Version 2.0 (the "License");
*  you may not use this file except in compliance with the License.
*  You may obtain a copy of the License at
*
*         http://www.apache.org/licenses/LICENSE-2.0.txt
*
*  Unless required by applicable law or agreed to in writing, software
*  distributed under the License is distributed on an "AS IS" BASIS,
*  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*  See the License for the specific language governing permissions and
*  limitations under the License.
*
*=========================================================================*/
  1. ifndef __itkImageToVTKImageFilter_h
  2. define __itkImageToVTKImageFilter_h
  1. include "itkVTKImageExport.h"
  2. include "vtkImageImport.h"
  3. include "vtkImageData.h"

namespace itk {

/** \class ImageToVTKImageFilter

* \brief Converts an ITK image into a VTK image and plugs a
*  itk data pipeline to a VTK datapipeline.
*
*  This class puts together an itkVTKImageExporter and a vtkImageImporter.
*  It takes care of the details related to the connection of ITK and VTK
*  pipelines. The User will perceive this filter as an adaptor to which
*  an itk::Image can be plugged as input and a vtkImage is produced as
*  output.
*
* \ingroup   ImageFilters
*/

template <class TInputImage > class ImageToVTKImageFilter : public ProcessObject { public:

 /** Standard class typedefs. */
 typedef ImageToVTKImageFilter       Self;
 typedef ProcessObject             Superclass;
 typedef SmartPointer<Self>        Pointer;
 typedef SmartPointer<const Self>  ConstPointer;
 /** Method for creation through the object factory. */
 itkNewMacro(Self);
 /** Run-time type information (and related methods). */
 itkTypeMacro(ImageToVTKImageFilter, ProcessObject);
 /** Some typedefs. */
 typedef TInputImage InputImageType;
 typedef typename InputImageType::ConstPointer  InputImagePointer;
 typedef VTKImageExport< InputImageType>        ExporterFilterType;
 typedef typename ExporterFilterType::Pointer   ExporterFilterPointer;
 /** Get the output in the form of a vtkImage.
     This call is delegated to the internal vtkImageImporter filter  */
 vtkImageData *  GetOutput() const;
 /** Set the input in the form of an itk::Image */
 using Superclass::SetInput;
 void SetInput( const InputImageType * );
 /** Return the internal VTK image importer filter.
     This is intended to facilitate users the access
     to methods in the importer */
 vtkImageImport * GetImporter() const;
 /** Return the internal ITK image exporter filter.
     This is intended to facilitate users the access
     to methods in the exporter */
 ExporterFilterType * GetExporter() const;
 /** This call delegate the update to the importer */
 void Update();

protected:

 ImageToVTKImageFilter();
 virtual ~ImageToVTKImageFilter();

private:

 ImageToVTKImageFilter(const Self&); //purposely not implemented
 void operator=(const Self&); //purposely not implemented
 ExporterFilterPointer       m_Exporter;
 vtkImageImport *            m_Importer;

};

} // end namespace itk

  1. ifndef ITK_MANUAL_INSTANTIATION
  2. include "itkImageToVTKImageFilter.txx"
  3. endif
  1. endif

</source>

itkImageToVTKImageFilter.txx

<source lang=cpp> /*=========================================================================

*
*  Copyright Insight Software Consortium
*
*  Licensed under the Apache License, Version 2.0 (the "License");
*  you may not use this file except in compliance with the License.
*  You may obtain a copy of the License at
*
*         http://www.apache.org/licenses/LICENSE-2.0.txt
*
*  Unless required by applicable law or agreed to in writing, software
*  distributed under the License is distributed on an "AS IS" BASIS,
*  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*  See the License for the specific language governing permissions and
*  limitations under the License.
*
*=========================================================================*/
  1. ifndef _itkImageToVTKImageFilter_txx
  2. define _itkImageToVTKImageFilter_txx
  1. include "itkImageToVTKImageFilter.h"

namespace itk {

/**

* Constructor
*/

template <class TInputImage> ImageToVTKImageFilter<TInputImage>

ImageToVTKImageFilter()

{

 m_Importer = vtkImageImport::New();
 m_Exporter = ExporterFilterType::New();
 m_Importer->SetUpdateInformationCallback(m_Exporter->GetUpdateInformationCallback());
 m_Importer->SetPipelineModifiedCallback(m_Exporter->GetPipelineModifiedCallback());
 m_Importer->SetWholeExtentCallback(m_Exporter->GetWholeExtentCallback());
 m_Importer->SetSpacingCallback(m_Exporter->GetSpacingCallback());
 m_Importer->SetOriginCallback(m_Exporter->GetOriginCallback());
 m_Importer->SetScalarTypeCallback(m_Exporter->GetScalarTypeCallback());
 m_Importer->SetNumberOfComponentsCallback(m_Exporter->GetNumberOfComponentsCallback());
 m_Importer->SetPropagateUpdateExtentCallback(m_Exporter->GetPropagateUpdateExtentCallback());
 m_Importer->SetUpdateDataCallback(m_Exporter->GetUpdateDataCallback());
 m_Importer->SetDataExtentCallback(m_Exporter->GetDataExtentCallback());
 m_Importer->SetBufferPointerCallback(m_Exporter->GetBufferPointerCallback());
 m_Importer->SetCallbackUserData(m_Exporter->GetCallbackUserData());

}

/**

* Destructor
*/

template <class TInputImage> ImageToVTKImageFilter<TInputImage>

~ImageToVTKImageFilter()

{

 if( m_Importer )
   {
   m_Importer->Delete();
   m_Importer = 0;
   }

}

/**

* Set an itk::Image as input
*/

template <class TInputImage> void ImageToVTKImageFilter<TInputImage>

SetInput( const InputImageType * inputImage )

{

 m_Exporter->SetInput( inputImage );

}

/**

* Get a vtkImage as output
*/

template <class TInputImage> vtkImageData * ImageToVTKImageFilter<TInputImage>

GetOutput() const

{

 return m_Importer->GetOutput();

}

/**

* Get the importer filter
*/

template <class TInputImage> vtkImageImport * ImageToVTKImageFilter<TInputImage>

GetImporter() const

{

 return m_Importer;

}

/**

* Get the exporter filter
*/

template <class TInputImage> typename ImageToVTKImageFilter<TInputImage>::ExporterFilterType * ImageToVTKImageFilter<TInputImage>

GetExporter() const

{

 return m_Exporter.GetPointer();

}

/**

* Delegate the Update to the importer
*/

template <class TInputImage> void ImageToVTKImageFilter<TInputImage>

Update()

{

 m_Importer->Update();

} } // end namespace itk

  1. endif

</source>

QuickView.h

<source lang="cpp"> /*=========================================================================

*
*  Copyright Insight Software Consortium
*
*  Licensed under the Apache License, Version 2.0 (the "License");
*  you may not use this file except in compliance with the License.
*  You may obtain a copy of the License at
*
*         http://www.apache.org/licenses/LICENSE-2.0.txt
*
*  Unless required by applicable law or agreed to in writing, software
*  distributed under the License is distributed on an "AS IS" BASIS,
*  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*  See the License for the specific language governing permissions and
*  limitations under the License.
*
*=========================================================================*/
  1. ifndef QuickView_h
  2. define QuickView_h
  1. include <vector>
  2. include <algorithm>
  3. include <string>
  1. include <itkImage.h>
  2. include <itkRGBPixel.h>
  3. include <itkIntTypes.h>

/** \class ImageInfo

* \brief A container for an image and its descriptiom
* \ingroup ITKVtkGlue
*/

class ImageInfo { public:

 typedef itk::Image<unsigned char, 2> ImageType;
 ImageInfo(ImageType *image, std::string description="")
 {
   m_Image = image;
   m_Description = description;
 }
 ImageType::Pointer m_Image;
 std::string        m_Description;

};

/** \class RGBImageInfo

* \brief A container for an rgb image and its descriptiom
* \ingroup ITKVtkGlue
*/

class RGBImageInfo { public:

 typedef itk::Image<itk::RGBPixel<unsigned char>, 2> ImageType;
 RGBImageInfo(ImageType *image, std::string description="")
 {
   m_Image = image;
   m_Description = description;
 }
 ImageType::Pointer m_Image;
 std::string        m_Description;

};

/** \class QuickView

* \brief A convenient class to render itk images with vtk
*
* This class presents a convenient and efficient mechanism to display
* ITK images in VTK render windows.
*
* The AddImage and AddRGBImage methods collect ITK images to be
* rendered in a collection of VTK RenderWindow's. Each image can
* be flipped about the vertical axis. An optional description will be
* displayed at the bottom of each render window.
*
* If m_ShareCamera is true, a single <a href="http://www.vtk.org/doc/nightly/html/classvtkCamera.html">vtkCamera</a>
* will be used for each render window (default is false).
*
* Each image is rescaled to have a range between 0 and 255. Currently, the size
* of each render window is fixed at 300,300 and the text size for descriptions
* is fixed at 10.
*
* The Visualize method displays the render windows and starts a
* <a href="http://www.vtk.org/doc/nightly/html/classvtkInteractorStyleImage.html">vtkInteractorStyleImage</a>.
* The layout and background color of each render window is fixed. The optional
* boolean for the constructor, if false, bypasses the interactor. This is useful
* for running tests.
*
* Typical usage:
*
* \code
*  QuickView viewer;
*  viewer.AddImage(someFilter->GetOutput().
*                  true (to flip image) or false.
*                  "text to display with the image");
*
*  viewer.AddRGBImage(someFilter->GetOutput().
*                     true (to flip image) or false.
*                     "text to display with the image");
*  \endcode
*
* \ingroup ITKVtkGlue
*/

class QuickView { public:

 QuickView()
 {
   m_ShareCamera = true;
   m_Interpolate = true;
   m_Counter = 0;
   m_Snapshot = false;
   m_SnapshotPath = "";
   m_SnapshotPrefix = "snapshot_";
   m_SnapshotExtension = "png";
   m_NumberOfColumns = 4;
   m_ViewPortSize = 300;
 }
 /** Add an image to be rendered. */
 template<typename TImage> void AddImage(
   TImage *,
   bool FlipVertical=true,
   std::string Description="");
 /** Add an RGB image to be rendered */
 template<typename TImage> void AddRGBImage(
   TImage *,
   bool FlipVertical=true,
   std::string Description="");
 /** Render the images. If interact is tru, start a vtk
  * Interactor. If false, return after one render.
  */
 void Visualize(bool interact=true);


 /** Each render window will have its own camera */
 void ShareCameraOff()
 {
   m_ShareCamera = false;
 }
 /** Each render window will use the same camera */
 void ShareCameraOn()
 {
   m_ShareCamera = true;
 }
 /** Use pixel replication in rendered image */
 void InterpolateOff()
 {
   m_Interpolate = false;
 }
 /** Use pixel interpolation in rendered image */
 void InterpolateOn()
 {
   m_Interpolate = true;
 }
 /** Each render window will take a snaphot */
 void SnapshotOn()
 {
   m_Snapshot = true;
 }
 /** Each render window will take a snaphot */
 void SnapshotOff()
 {
   m_Snapshot = false;
 }
 void SetSnapshotPath( const std::string& iPath )
 {
   m_SnapshotPath = iPath;
 }
 void SetSnapshotPrefix( const std::string& iPrefix )
 {
   m_SnapshotPrefix = iPrefix;
 }
 /** Provide the image format to be used when taking snapshot */
 void SetSnapshotExtension( const std::string& iExtension )
 {
   m_SnapshotExtension = iExtension;
   std::transform(
         m_SnapshotExtension.begin(),
         m_SnapshotExtension.end(),
         m_SnapshotExtension.begin(),
         ::tolower );
 }
 /** Set the number of columns, default 4.*/
 void SetNumberOfColumns (const unsigned int columns)
 {
   m_NumberOfColumns = columns;
 }
 /** Set the viewport size, default 300.*/
 void SetViewPortSize (const unsigned int size)
 {
   m_ViewPortSize = size;
 }

private:

 std::vector<ImageInfo>    Images;        // Container for images
 std::vector<RGBImageInfo> RGBImages;     // Container for rgb images
 itk::IdentifierType       m_Counter;
 std::string               m_SnapshotPath;
 std::string               m_SnapshotPrefix;
 std::string               m_SnapshotExtension;
 bool                      m_ShareCamera;
 bool                      m_Snapshot;
 bool                      m_Interpolate;
 unsigned int              m_NumberOfColumns;
 unsigned int              m_ViewPortSize;

};

  1. endif

</source>

QuickView.cxx

<source lang="cpp"> /*=========================================================================

*
*  Copyright Insight Software Consortium
*
*  Licensed under the Apache License, Version 2.0 (the "License");
*  you may not use this file except in compliance with the License.
*  You may obtain a copy of the License at
*
*         http://www.apache.org/licenses/LICENSE-2.0.txt
*
*  Unless required by applicable law or agreed to in writing, software
*  distributed under the License is distributed on an "AS IS" BASIS,
*  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*  See the License for the specific language governing permissions and
*  limitations under the License.
*
*=========================================================================*/
  1. include "QuickView.h"
  1. include "itkRescaleIntensityImageFilter.h"
  2. include "itkVectorRescaleIntensityImageFilter.h"
  3. include "itkRGBToVectorImageAdaptor.h"
  4. include "itkFlipImageFilter.h"
  1. include "vtkVersion.h"
  1. include "vtkRenderWindowInteractor.h"
  2. include "vtkImageMapper3D.h"
  3. include "vtkImageActor.h"
  4. include "vtkActor2D.h"
  5. include "vtkInteractorStyleImage.h"
  6. include "vtkRenderer.h"
  7. include "vtkCamera.h"
  8. include "vtkTextProperty.h"
  9. include "vtkTextMapper.h"
  1. include "vtkCaptureScreen.h"
  2. include "vtkPNGWriter.h"
  3. include "vtkJPEGWriter.h"
  4. include "vtkBMPWriter.h"
  5. include "vtkTIFFWriter.h"
  1. include "itkImageToVTKImageFilter.h"


typedef itk::Image<itk::RGBPixel<unsigned char>, 2> UnsignedCharRGBImageType; typedef itk::Image<itk::RGBPixel<float>, 2> FloatRGBImageType;

typedef itk::Image<unsigned char, 2> UnsignedCharImageType; typedef itk::Image<char, 2> CharImageType; typedef itk::Image<unsigned short, 2> UnsignedShortImageType; typedef itk::Image<short, 2> ShortImageType; typedef itk::Image<unsigned int, 2> UnsignedIntImageType; typedef itk::Image<int, 2> IntImageType; typedef itk::Image<unsigned long, 2> UnsignedLongImageType; typedef itk::Image<long, 2> LongImageType; typedef itk::Image<float, 2> FloatImageType; typedef itk::Image<double, 2> DoubleImageType;

template void QuickView::AddImage<CharImageType>(

 CharImageType *image,
 bool FlipVertical,
 std::string Description);

template void QuickView::AddImage<UnsignedShortImageType>(

 UnsignedShortImageType *image,
 bool FlipVertical,
 std::string Description);

template void QuickView::AddImage<ShortImageType>(

 ShortImageType *image,
 bool FlipVertical,
 std::string Description);

template void QuickView::AddImage<UnsignedIntImageType>(

 UnsignedIntImageType *image,
 bool FlipVertical,
 std::string Description);

template void QuickView::AddImage<IntImageType>(

 IntImageType *image,
 bool FlipVertical,
 std::string Description);

template void QuickView::AddImage<UnsignedLongImageType>(

 UnsignedLongImageType *image,
 bool FlipVertical,
 std::string Description);

template void QuickView::AddImage<LongImageType>(

 LongImageType *image,
 bool FlipVertical,
 std::string Description);

template void QuickView::AddImage<FloatImageType>(

 FloatImageType *image,
 bool FlipVertical,
 std::string Description);

template void QuickView::AddImage<DoubleImageType>(

 DoubleImageType *image,
 bool FlipVertical,
 std::string Description);

template< > void QuickView::AddImage<UnsignedCharImageType>(

 UnsignedCharImageType *image,
 bool FlipVertical,
 std::string Description)

{

 if (FlipVertical)
   {
   typedef itk::FlipImageFilter< UnsignedCharImageType> FlipFilterType;
   FlipFilterType::Pointer flipper = FlipFilterType::New();
   bool flipAxes[3] = { false, true, false };
   flipper = FlipFilterType::New();
   flipper->SetFlipAxes(flipAxes);
   flipper->SetInput(image);
   flipper->Update();
   ImageInfo myImage(flipper->GetOutput(), Description);
   this->Images.push_back(myImage);
   }
 else
   {
   ImageInfo myImage(image, Description);
   this->Images.push_back(myImage);
   }

}

template<typename TImage> void QuickView::AddImage(

 TImage *image,
 bool FlipVertical,
 std::string Description)

{

 typedef itk::RescaleIntensityImageFilter<TImage, UnsignedCharImageType >
   rescaleFilterType;
 typename rescaleFilterType::Pointer rescaler = rescaleFilterType::New();
 rescaler->SetOutputMinimum(0);
 rescaler->SetOutputMaximum(255);
 rescaler->SetInput(image);
 rescaler->Update();
 this->AddImage(rescaler->GetOutput(), FlipVertical, Description);

}

template< > void QuickView::AddImage<UnsignedCharRGBImageType>(

 UnsignedCharRGBImageType *image,
 bool FlipVertical,
 std::string Description)

{

 if (FlipVertical)
   {
   typedef itk::FlipImageFilter< UnsignedCharRGBImageType> FlipFilterType;
   FlipFilterType::Pointer flipper = FlipFilterType::New();
   bool flipAxes[3] = { false, true, false };
   flipper = FlipFilterType::New();
   flipper->SetFlipAxes(flipAxes);
   flipper->SetInput(image);
   flipper->Update();
   RGBImageInfo myImage(flipper->GetOutput(), Description);
   this->RGBImages.push_back(myImage);
   }
 else
   {
   RGBImageInfo myImage(image, Description);
   this->RGBImages.push_back(myImage);
   }

}

template< > void QuickView::AddRGBImage<UnsignedCharRGBImageType>(

 UnsignedCharRGBImageType *image,
 bool FlipVertical,
 std::string Description)

{

 if (FlipVertical)
   {
   typedef itk::FlipImageFilter< UnsignedCharRGBImageType> FlipFilterType;
   FlipFilterType::Pointer flipper = FlipFilterType::New();
   bool flipAxes[3] = { false, true, false };
   flipper = FlipFilterType::New();
   flipper->SetFlipAxes(flipAxes);
   flipper->SetInput(image);
   flipper->Update();
   RGBImageInfo myImage(flipper->GetOutput(), Description);
   this->RGBImages.push_back(myImage);
   }
 else
   {
   RGBImageInfo myImage(image, Description);
   this->RGBImages.push_back(myImage);
   }

}

template< > void QuickView::AddRGBImage<FloatRGBImageType>(

 FloatRGBImageType *image,
 bool FlipVertical,
 std::string Description)

{

 typedef itk::RGBToVectorImageAdaptor<FloatRGBImageType> AdaptorType;
 AdaptorType::Pointer adaptor = AdaptorType::New();
 adaptor->SetImage(image);
 typedef itk::VectorRescaleIntensityImageFilter<AdaptorType, UnsignedCharRGBImageType > rescaleFilterType;
 rescaleFilterType::Pointer rescaler = rescaleFilterType::New();
 rescaler->SetOutputMaximumMagnitude(255);
 rescaler->SetInput(adaptor);
 rescaler->Update();
 this->AddRGBImage(rescaler->GetOutput(), FlipVertical, Description);

}

template< > void QuickView::AddImage<FloatRGBImageType>(

 FloatRGBImageType *image,
 bool FlipVertical,
 std::string Description)

{

 typedef itk::RGBToVectorImageAdaptor<FloatRGBImageType> AdaptorType;
 AdaptorType::Pointer adaptor = AdaptorType::New();
 adaptor->SetImage(image);
 typedef itk::VectorRescaleIntensityImageFilter<AdaptorType, UnsignedCharRGBImageType > rescaleFilterType;
 rescaleFilterType::Pointer rescaler = rescaleFilterType::New();
 rescaler->SetOutputMaximumMagnitude(255);
 rescaler->SetInput(adaptor);
 rescaler->Update();
 this->AddRGBImage(rescaler->GetOutput(), FlipVertical, Description);

}

void QuickView::Visualize(bool interact) {

 unsigned int rendererSize = this->m_ViewPortSize;
 unsigned int numberOfImages = this->Images.size() + this->RGBImages.size();
 unsigned int numberOfRows = (numberOfImages - 1) / this->m_NumberOfColumns + 1;
 unsigned int numberOfColumns = numberOfImages / (numberOfRows) + 1;
 if (numberOfColumns > numberOfImages)
   {
   numberOfColumns = numberOfImages;
   }
 // Setup the render window and interactor
 vtkSmartPointer<vtkRenderWindow> renderWindow =
   vtkSmartPointer<vtkRenderWindow>::New();
 renderWindow->SetSize(rendererSize * numberOfColumns,
                       rendererSize * numberOfRows);
 vtkSmartPointer<vtkRenderWindowInteractor> interactor =
   vtkSmartPointer<vtkRenderWindowInteractor>::New();
 interactor->SetRenderWindow(renderWindow);
 // Render all of the images
 std::vector<double*> viewports;
 typedef itk::ImageToVTKImageFilter<itk::Image<unsigned char, 2> >
   ConnectorType;
 typedef itk::ImageToVTKImageFilter<itk::Image<itk::RGBPixel<unsigned char>, 2> >
   RGBConnectorType;
 std::vector<ConnectorType::Pointer>    connectors; // Force the connectors to persist (not lose scope) after each iteration of the loop
 std::vector<RGBConnectorType::Pointer> RGBconnectors; // Force the connectors to persist after each iteration of the loop
 double background[6] = {.4, .5, .6, .6, .5, .4};
 vtkSmartPointer<vtkCamera> sharedCamera =
   vtkSmartPointer<vtkCamera>::New();
 for(unsigned int row = 0; row < numberOfRows; ++row)
   {
   for(unsigned int col = 0; col < numberOfColumns; ++col)
     {
     size_t i = row * numberOfColumns + col;
     // (xmin, ymin, xmax, ymax)
     double viewport[4] =
       {static_cast<double>(col) * rendererSize / (numberOfColumns * rendererSize),
        static_cast<double>(numberOfRows - (row+1)) * rendererSize / (numberOfRows * rendererSize),
        static_cast<double>(col+1)*rendererSize / (numberOfColumns * rendererSize),
        static_cast<double>(numberOfRows - row) * rendererSize / (numberOfRows * rendererSize)};
     viewports.push_back(viewport);
     // Grayscale images
     if (i < this->Images.size())
       {
       ConnectorType::Pointer connector = ConnectorType::New();
       connectors.push_back(connector);
       connector->SetInput(this->Images[i].m_Image);
       vtkSmartPointer<vtkImageActor> actor =
         vtkSmartPointer<vtkImageActor>::New();
  1. if VTK_MAJOR_VERSION <= 5
       actor->SetInput(connector->GetOutput());
  1. else
       connector->Update();
       actor->GetMapper()->SetInputData(connector->GetOutput());
  1. endif
       // Setup renderer
       vtkSmartPointer<vtkRenderer> renderer =
         vtkSmartPointer<vtkRenderer>::New();
       renderWindow->AddRenderer(renderer);
       renderer->SetViewport(viewports[i]);
       renderer->SetBackground(background);
       if (m_ShareCamera)
         {
         renderer->SetActiveCamera(sharedCamera);
         }
       else
         {
         vtkSmartPointer<vtkCamera> aCamera =
           vtkSmartPointer<vtkCamera>::New();
         renderer->SetActiveCamera(aCamera);
         }
       std::rotate(background, background + 1, background + 6);
       if (this->Images[i].m_Description != "")
         {
         vtkSmartPointer<vtkTextProperty> textProperty =
           vtkSmartPointer<vtkTextProperty>::New();
         textProperty->SetFontSize(10);
         textProperty->SetFontFamilyToCourier();
         textProperty->SetJustificationToCentered();
         vtkSmartPointer<vtkTextMapper> textMapper =
           vtkSmartPointer<vtkTextMapper>::New();
         textMapper->SetTextProperty(textProperty);
         textMapper->SetInput(this->Images[i].m_Description.c_str());
         vtkSmartPointer<vtkActor2D> textActor =
           vtkSmartPointer<vtkActor2D>::New();
         textActor->SetMapper(textMapper);
         textActor->SetPosition(rendererSize/2, 16);
         renderer->AddActor(textActor);
         }
       if (m_Interpolate)
         {
         actor->InterpolateOn();
         }
       else
         {
         actor->InterpolateOff();
         }
       renderer->AddActor(actor);
       renderer->ResetCamera();
       }
     // RGB Images
     else if (i >= this->Images.size() && i < numberOfImages)
       {
       unsigned int j = row * numberOfColumns + col - this->Images.size();
       RGBConnectorType::Pointer connector = RGBConnectorType::New();
       RGBconnectors.push_back(connector);
       connector->SetInput(this->RGBImages[j].m_Image);
       vtkSmartPointer<vtkImageActor> actor =
         vtkSmartPointer<vtkImageActor>::New();
  1. if VTK_MAJOR_VERSION <= 5
       actor->SetInput(connector->GetOutput());
  1. else
       connector->Update();
       actor->GetMapper()->SetInputData(connector->GetOutput());
  1. endif
       // Setup renderer
       vtkSmartPointer<vtkRenderer> renderer =
         vtkSmartPointer<vtkRenderer>::New();
       renderWindow->AddRenderer(renderer);
       renderer->SetViewport(viewports[i]);
       renderer->SetBackground(background);
       if (m_ShareCamera)
         {
         renderer->SetActiveCamera(sharedCamera);
         }
       else
         {
         vtkSmartPointer<vtkCamera> aCamera =
           vtkSmartPointer<vtkCamera>::New();
         renderer->SetActiveCamera(aCamera);
         }
       std::rotate(background, background + 1, background + 6);
       if (this->RGBImages[j].m_Description != "")
         {
         vtkSmartPointer<vtkTextProperty> textProperty =
           vtkSmartPointer<vtkTextProperty>::New();
         textProperty->SetFontSize(10);
         textProperty->SetFontFamilyToCourier();
         textProperty->SetJustificationToCentered();
         vtkSmartPointer<vtkTextMapper> textMapper =
           vtkSmartPointer<vtkTextMapper>::New();
         textMapper->SetTextProperty(textProperty);
         textMapper->SetInput(this->RGBImages[j].m_Description.c_str());
         vtkSmartPointer<vtkActor2D> textActor =
           vtkSmartPointer<vtkActor2D>::New();
         textActor->SetMapper(textMapper);
         textActor->SetPosition(rendererSize/2, 16);
         renderer->AddActor(textActor);
         }
       if (m_Interpolate)
         {
         actor->InterpolateOn();
         }
       else
         {
         actor->InterpolateOff();
         }
       renderer->AddActor(actor);
       renderer->ResetCamera();
       }
     else
       {
       // Fill empty viewports
       vtkSmartPointer<vtkRenderer> renderer =
         vtkSmartPointer<vtkRenderer>::New();
       renderWindow->AddRenderer(renderer);
       renderer->SetViewport(viewports[i]);
       renderer->SetBackground(background);
       continue;
       }
     }
   }
   renderWindow->Render();
   if( m_Snapshot )
   {
   std::string filename;
   std::stringstream temp;
   temp << m_SnapshotPath << m_SnapshotPrefix << m_Counter << ".";
   filename = temp.str();
   filename.append( m_SnapshotExtension );
   if( m_SnapshotExtension == "png" )
     {
     vtkCaptureScreen< vtkPNGWriter > capture( renderWindow );
     capture( filename );
     }
   if( ( m_SnapshotExtension == "jpg" ) || ( m_SnapshotExtension == "jpeg" ) )
     {
     vtkCaptureScreen< vtkJPEGWriter > capture( renderWindow );
     capture( filename );
     }
   if( m_SnapshotExtension == "bmp" )
     {
     vtkCaptureScreen< vtkBMPWriter > capture( renderWindow );
     capture( filename );
     }
   if( ( m_SnapshotExtension == "tif" ) || ( m_SnapshotExtension == "tiff" ) )
     {
     vtkCaptureScreen< vtkTIFFWriter > capture( renderWindow );
     capture( filename );
     }
   m_Counter++;
   }
 vtkSmartPointer<vtkInteractorStyleImage> style =
   vtkSmartPointer<vtkInteractorStyleImage>::New();
 interactor->SetInteractorStyle(style);
 if (interact)
   {
   interactor->Start();
   }

} </source>

vtkCaptureScreen.h

<source lang="cpp"> /*=========================================================================

*
*  Copyright Insight Software Consortium
*
*  Licensed under the Apache License, Version 2.0 (the "License");
*  you may not use this file except in compliance with the License.
*  You may obtain a copy of the License at
*
*         http://www.apache.org/licenses/LICENSE-2.0.txt
*
*  Unless required by applicable law or agreed to in writing, software
*  distributed under the License is distributed on an "AS IS" BASIS,
*  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*  See the License for the specific language governing permissions and
*  limitations under the License.
*
*=========================================================================*/
  1. ifndef __vtkCaptureScreen_h
  2. define __vtkCaptureScreen_h
  1. include <string>
  2. include "vtkSmartPointer.h"
  3. include "vtkWindowToImageFilter.h"
  4. include "vtkRenderWindow.h"

template < class TImageWriter > class vtkCaptureScreen

 {

public:

 typedef TImageWriter ImageWriterType;
 vtkCaptureScreen( vtkRenderWindow* iRenderer ) : m_Renderer ( iRenderer )
   {}
 vtkCaptureScreen() : m_Renderer( NULL )
   {}
 ~vtkCaptureScreen( )
   {}
 void operator( ) ( const std::string& iFileName ) const
   {
   Capture( m_Renderer, iFileName );
   }
 void operator( ) ( vtkRenderWindow* iRenderer,
                    const std::string& iFileName ) const
   {
   m_Renderer = iRenderer;
   Capture( m_Renderer, iFileName );
   }
 private:
   vtkCaptureScreen ( const vtkCaptureScreen& );
   void operator = ( const vtkCaptureScreen& );
   vtkRenderWindow* m_Renderer;
   void Capture( vtkRenderWindow* iRenderer,
                 const std::string& iFileName ) const
     {
     if( iRenderer )
       {
       vtkSmartPointer< vtkWindowToImageFilter > Dumper =
           vtkSmartPointer< vtkWindowToImageFilter >::New( );
       Dumper->SetInput( iRenderer );
       Dumper->Update( );
       vtkSmartPointer< ImageWriterType > writer =
           vtkSmartPointer< ImageWriterType >::New( );
       writer->SetFileName ( iFileName.c_str( ) );
       writer->SetInputConnection ( Dumper->GetOutputPort( ) );
       writer->Write( );
       }
     }
 };
  1. endif

</source>