ITK  4.13.0
Insight Segmentation and Registration Toolkit
WikiExamples/ImageProcessing/RecursiveMultiResolutionPyramidImageFilter.cxx
#include "itkImage.h"
typedef itk::Image< unsigned char, 2 > UnsignedCharImageType;
static void CreateImage(UnsignedCharImageType::Pointer image);
int main(int, char *[])
{
UnsignedCharImageType::Pointer image = UnsignedCharImageType::New();
CreateImage(image);
typedef itk::Image<float, 2 > FloatImageType;
unsigned int numberOfLevels = 4;
UnsignedCharImageType, FloatImageType> RecursiveMultiResolutionPyramidImageFilterType;
RecursiveMultiResolutionPyramidImageFilterType::Pointer recursiveMultiResolutionPyramidImageFilter =
RecursiveMultiResolutionPyramidImageFilterType::New();
recursiveMultiResolutionPyramidImageFilter->SetInput(image);
recursiveMultiResolutionPyramidImageFilter->SetNumberOfLevels(numberOfLevels);
recursiveMultiResolutionPyramidImageFilter->Update();
// This outputs the levels (0 is the lowest resolution)
for(unsigned int i = 0; i < numberOfLevels; ++i)
{
// Scale so we can write to a PNG
RescaleFilterType::Pointer rescaleFilter = RescaleFilterType::New();
rescaleFilter->SetInput(recursiveMultiResolutionPyramidImageFilter->GetOutput(i));
rescaleFilter->SetOutputMinimum(0);
rescaleFilter->SetOutputMaximum(255);
rescaleFilter->Update();
FileWriterType::Pointer writer = FileWriterType::New();
std::stringstream ss;
ss << "output_" << i << ".png";
std::cout << "Writing " << ss.str() << std::endl;
writer->SetFileName(ss.str());
writer->SetInput(rescaleFilter->GetOutput());
writer->Update();
}
return EXIT_SUCCESS;
}
void CreateImage(UnsignedCharImageType::Pointer image)
{
// Create a black image with 2 white regions
start.Fill(0);
size.Fill(200);
UnsignedCharImageType::RegionType region(start,size);
image->SetRegions(region);
image->Allocate();
image->FillBuffer(0);
// Make a square
for(unsigned int r = 20; r < 80; r++)
{
for(unsigned int c = 30; c < 100; c++)
{
pixelIndex[0] = r;
pixelIndex[1] = c;
image->SetPixel(pixelIndex, 255);
}
}
}