ITK/Examples/Utilities/SimpleFilterWatcher

This example demonstrates how to watch what is going on inside of a filter.

SimpleFilterWatcher.cxx

<source lang="cpp">

1. include "itkImage.h"
2. include "itkSimpleFilterWatcher.h"
3. include "itkThresholdImageFilter.h"
4. include "itkImageRegionIterator.h"

typedef itk::Image<unsigned char, 2> ImageType; static void CreateImage(ImageType::Pointer image);

int main(int, char *[]) {

 ImageType::Pointer image = ImageType::New();
 CreateImage(image);
 
 typedef itk::ThresholdImageFilter <ImageType>
         ThresholdImageFilterType;

 ThresholdImageFilterType::Pointer thresholdFilter
         = ThresholdImageFilterType::New();
 thresholdFilter->SetInput(image);
 thresholdFilter->ThresholdBelow(100);
 thresholdFilter->SetOutsideValue(0);

 itk::SimpleFilterWatcher watcher(thresholdFilter, "ThresholdFilter");

 thresholdFilter->Update();
 
 return EXIT_SUCCESS;

} void CreateImage(ImageType::Pointer image) {

 // Create an image with 2 connected components
 ImageType::RegionType region;
 ImageType::IndexType start;
 start[0] = 0;
 start[1] = 0;

 ImageType::SizeType size;
 size[0] = 100;
 size[1] = 100;

 region.SetSize(size);
 region.SetIndex(start);

 image->SetRegions(region);
 image->Allocate();
 
 itk::ImageRegionIterator<ImageType> imageIterator(image,region);

 while(!imageIterator.IsAtEnd())
   {
   imageIterator.Set(255);

   ++imageIterator;
   }

}

</source>

CMakeLists.txt

<source lang="cmake"> cmake_minimum_required(VERSION 2.6)

PROJECT(SimpleFilterWatcher)

FIND_PACKAGE(ITK REQUIRED) INCLUDE(${ITK_USE_FILE})

ADD_EXECUTABLE(SimpleFilterWatcher SimpleFilterWatcher.cpp) TARGET_LINK_LIBRARIES(SimpleFilterWatcher ITKIO)

</source>