VTK/Examples/Cxx/Images/ResizeImage
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Jump to navigationJump to searchResize an image using a sinc interpolator. Without command line arguments, the example resize a synthetic image. A jpeg file can be passed on the command lines. The new dimensions can also be passed as well as an integer specifying the sinc interpolator. See vtkImageSincInterpolator for details. A -1 turns off interpolation.
ImageResize maintains the physical size of the image.
NOTE: This example was inspired by a question asked by Qiang Wang.
Contents
ResizeImage.cxx
#include <vtkImageResize.h>
#include "vtkImageSincInterpolator.h"
#include <vtkVersion.h>
#include <vtkImageActor.h>
#include <vtkImageCanvasSource2D.h>
#include <vtkImageData.h>
#include <vtkJPEGReader.h>
#include <vtkImageMapper3D.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkInteractorStyleImage.h>
#include <vtkSmartPointer.h>
int main(int argc, char *argv[])
{
vtkSmartPointer<vtkImageData> imageData;
int newSize[2] = {200, 10};
int windowFunction = 0;
// Verify input arguments
if ( argc > 1 )
{
//Read the image
vtkSmartPointer<vtkJPEGReader> jpegReader =
vtkSmartPointer<vtkJPEGReader>::New();
jpegReader->SetFileName ( argv[1] );
jpegReader->Update();
imageData = jpegReader->GetOutput();
if (argc >3)
{
newSize[0] = atoi(argv[2]);
newSize[1] = atoi(argv[3]);
}
if (argc > 4)
{
windowFunction = atoi(argv[4]);
}
}
else
{
vtkSmartPointer<vtkImageCanvasSource2D> canvasSource =
vtkSmartPointer<vtkImageCanvasSource2D>::New();
canvasSource->SetExtent(0, 100, 0, 100, 0, 0);
canvasSource->SetScalarTypeToUnsignedChar();
canvasSource->SetNumberOfScalarComponents(3);
canvasSource->SetDrawColor(127, 127, 100);
canvasSource->FillBox(0, 100, 0, 100);
canvasSource->SetDrawColor(100, 255, 255);
canvasSource->FillTriangle(10, 10, 25, 10, 25, 25);
canvasSource->SetDrawColor(255, 100, 255);
canvasSource->FillTube(75, 75, 0, 75, 5.0);
canvasSource->Update();
imageData = canvasSource->GetOutput();
}
vtkSmartPointer<vtkImageSincInterpolator> interpolator =
vtkSmartPointer<vtkImageSincInterpolator>::New();
if (windowFunction >= 0 && windowFunction <= 10)
{
interpolator->SetWindowFunction(windowFunction);
}
vtkSmartPointer<vtkImageResize> resize =
vtkSmartPointer<vtkImageResize>::New();
#if VTK_MAJOR_VERSION <= 5
resize->SetInput(imageData);
#else
resize->SetInputData(imageData);
#endif
resize->SetOutputDimensions(newSize[0], newSize[1], 1);
resize->Update();
if (windowFunction < 0)
{
resize->InterpolateOff();
std::cout << "Using nearest neighbor interpolation" << std::endl;;
}
else
{
std::cout << "Using window function : "
<< interpolator->GetWindowFunctionAsString() << std::endl;;
}
// Create an image actor to display the image
vtkSmartPointer<vtkImageActor> imageActor =
vtkSmartPointer<vtkImageActor>::New();
imageActor->GetMapper()->SetInputConnection(resize->GetOutputPort());
// Setup renderer
vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
renderer->AddActor(imageActor);
renderer->ResetCamera();
// Setup render window
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->AddRenderer(renderer);
// Setup render window interactor
vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
vtkSmartPointer<vtkInteractorStyleImage> style =
vtkSmartPointer<vtkInteractorStyleImage>::New();
renderWindowInteractor->SetInteractorStyle(style);
// Render and start interaction
renderWindowInteractor->SetRenderWindow(renderWindow);
renderWindowInteractor->Initialize();
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
Please try the new VTKExamples website.
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(ResizeImage)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(ResizeImage MACOSX_BUNDLE ResizeImage.cxx)
if(VTK_LIBRARIES)
target_link_libraries(ResizeImage ${VTK_LIBRARIES})
else()
target_link_libraries(ResizeImage vtkHybrid vtkWidgets)
endif()
Download and Build ResizeImage
Click here to download ResizeImage. and its CMakeLists.txt file.
Once the tarball ResizeImage.tar has been downloaded and extracted,
cd ResizeImage/build
- If VTK is installed:
cmake ..
- If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:
cmake -DVTK_DIR:PATH=/home/me/vtk_build ..
Build the project:
make
and run it:
./ResizeImage
WINDOWS USERS PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.