VTK/Examples/Cxx/Images/ImageThreshold
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Jump to navigationJump to searchThe image on the left is the input image and the image on the right is the thresholded version.
Contents
ImageThreshold.cxx
#include <vtkSmartPointer.h>
#include <vtkImageData.h>
#include <vtkImageThreshold.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkInteractorStyleImage.h>
#include <vtkRenderer.h>
#include <vtkImageMapper3D.h>
#include <vtkImageActor.h>
#include <vtkImageCast.h>
#include <vtkImageMandelbrotSource.h>
int main(int, char *[])
{
// Create an image
vtkSmartPointer<vtkImageMandelbrotSource> imageSource =
vtkSmartPointer<vtkImageMandelbrotSource>::New();
imageSource->Update();
vtkSmartPointer<vtkImageThreshold> imageThreshold =
vtkSmartPointer<vtkImageThreshold>::New();
imageThreshold->SetInputConnection(imageSource->GetOutputPort());
unsigned char lower = 100;
unsigned char upper = 200;
imageThreshold->ThresholdBetween(lower, upper);
imageThreshold->ReplaceInOn();
imageThreshold->SetInValue(255);
imageThreshold->Update();
// Create actors
vtkSmartPointer<vtkImageActor> inputActor =
vtkSmartPointer<vtkImageActor>::New();
inputActor->GetMapper()->SetInputConnection(
imageSource->GetOutputPort());
vtkSmartPointer<vtkImageActor> thresholdedActor =
vtkSmartPointer<vtkImageActor>::New();
thresholdedActor->GetMapper()->SetInputConnection(
imageThreshold->GetOutputPort());
// There will be one render window
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->SetSize(600, 300);
// And one interactor
vtkSmartPointer<vtkRenderWindowInteractor> interactor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
interactor->SetRenderWindow(renderWindow);
// Define viewport ranges
// (xmin, ymin, xmax, ymax)
double leftViewport[4] = {0.0, 0.0, 0.5, 1.0};
double rightViewport[4] = {0.5, 0.0, 1.0, 1.0};
// Setup both renderers
vtkSmartPointer<vtkRenderer> leftRenderer =
vtkSmartPointer<vtkRenderer>::New();
renderWindow->AddRenderer(leftRenderer);
leftRenderer->SetViewport(leftViewport);
leftRenderer->SetBackground(.6, .5, .4);
vtkSmartPointer<vtkRenderer> rightRenderer =
vtkSmartPointer<vtkRenderer>::New();
renderWindow->AddRenderer(rightRenderer);
rightRenderer->SetViewport(rightViewport);
rightRenderer->SetBackground(.4, .5, .6);
leftRenderer->AddActor(inputActor);
rightRenderer->AddActor(thresholdedActor);
leftRenderer->ResetCamera();
rightRenderer->ResetCamera();
renderWindow->Render();
interactor->Start();
return EXIT_SUCCESS;
}
Please try the new VTKExamples website.
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(ImageThreshold)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(ImageThreshold MACOSX_BUNDLE ImageThreshold.cxx)
if(VTK_LIBRARIES)
target_link_libraries(ImageThreshold ${VTK_LIBRARIES})
else()
target_link_libraries(ImageThreshold vtkHybrid vtkWidgets)
endif()
Download and Build ImageThreshold
Click here to download ImageThreshold. and its CMakeLists.txt file.
Once the tarball ImageThreshold.tar has been downloaded and extracted,
cd ImageThreshold/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:
./ImageThreshold
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.