ImageValueRange
VTKExamples/Cxx/Images/ImageValueRange
Code¶
ImageValueRange.cxx
#include <vtkVersion.h> #include <vtkSmartPointer.h> #include <vtkDoubleArray.h> #include <vtkImageData.h> #include <vtkPointData.h> int main(int, char *[]) { // Create an image data vtkSmartPointer<vtkImageData> imageData = vtkSmartPointer<vtkImageData>::New(); // Specify the size of the image data imageData->SetDimensions(5,1,1); #if VTK_MAJOR_VERSION <= 5 imageData->SetNumberOfScalarComponents(1); imageData->SetScalarTypeToDouble(); imageData->AllocateScalars(); #else imageData->AllocateScalars(VTK_DOUBLE,1); #endif int* dims = imageData->GetDimensions(); for (int x = 0; x < dims[0]; x++) { double* pixel = static_cast<double*>(imageData->GetScalarPointer(x,0,0)); pixel[0] = x*10; } double valuesRange[2]; vtkDoubleArray::SafeDownCast(imageData->GetPointData()->GetArray("ImageScalars"))->GetValueRange(valuesRange); std::cout << "valuesRange = " << valuesRange[0] << " " << valuesRange[1] << std::endl; // This should also work: // min = vtkImageData->GetOutput()->GetScalarRange()[0] and max = GetScalarRange()[1]. return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(ImageValueRange) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(ImageValueRange MACOSX_BUNDLE ImageValueRange.cxx) target_link_libraries(ImageValueRange ${VTK_LIBRARIES})
Download and Build ImageValueRange¶
Danger
The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.
Click here to download ImageValueRange and its CMakeLists.txt file. Once the tarball ImageValueRange.tar has been downloaded and extracted,
cd ImageValueRange/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:
./ImageValueRange
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.