Hi everyone! I’m trying to write Cannyfilter image as a .png image.
It has no bugs. But it does not work. Here is the message:
itk::ExceptionObject (000000926B4FD6A0)
Location: "void __cdecl itk::PNGImageIO::WriteSlice(const class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > &,const void *)"
File: c:\itk\src\modules\io\png\src\itkpngimageio.cxx
Line: 519
Description: PNG supports unsigned char and unsigned short
I changed the type of pixeltype: to unsigned char or unsigned short, but I got the error: cannot convert from ‘itk::Concept::lsFloatingPoint<unsigned char>::Constraints::FalseT’ to ‘itk::Concept::Detail::UniqueType_bool<true>’
I get the same error with writing .jpg or .dcm image.
This is the example code I run:
#include "itkImage.h"
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
#include "itkRescaleIntensityImageFilter.h"
#include "itkCastImageFilter.h"
#include "itkCannyEdgeDetectionImageFilter.h"
#include "itksys/SystemTools.hxx"
#include <sstream>
#include "QuickView.h"
int main(int argc, char *argv[])
{
if(argc < 2)
{
std::cerr << "Usage: " << argv[0]
<< " Filename [variance lower_threshold upper_threshold]"
<< std::endl;
return EXIT_FAILURE;
}
std::string inputFileName = argv[1];
double variance = 2.0;
double upperThreshold = 0.0;
double lowerThreshold = 0.0;
if (argc > 2)
{
variance = atof(argv[2]);
}
if (argc > 3)
{
lowerThreshold = atof(argv[3]);
}
if (argc > 4)
{
upperThreshold = atof(argv[4]);
}
typedef itk::Image<float, 2> FloatImageType;
typedef itk::Image<unsigned char, 2> ImageType;
typedef itk::ImageFileReader<FloatImageType> ReaderType;
ReaderType::Pointer reader = ReaderType::New();
reader->SetFileName(inputFileName);
typedef itk::CannyEdgeDetectionImageFilter <FloatImageType, ImageType> CannyEdgeDetectionImageFilterType;
CannyEdgeDetectionImageFilterType::Pointer cannyFilter = CannyEdgeDetectionImageFilterType::New();
cannyFilter->SetInput(reader->GetOutput());
cannyFilter->SetVariance( variance );
cannyFilter->SetUpperThreshold( upperThreshold );
cannyFilter->SetLowerThreshold( lowerThreshold );
QuickView viewer;
//viewer.AddImage<DoubleImageType>(reader->GetOutput());
//viewer.AddImage<DoubleImageType>(cannyFilter->GetOutput());
viewer.AddImage(
reader->GetOutput(), true,
itksys::SystemTools::GetFilenameName(inputFileName));
std::stringstream desc;
desc << "Canny image, variance = "<< variance<< std::endl
<< "upperThreshold = " <<upperThreshold << std::endl
<<"lowerThreshold = " <<lowerThreshold;
viewer.AddImage(cannyFilter->GetOutput(), true, desc.str());
std::stringstream ss;
ss << "canny1.png";
typedef itk::ImageFileWriter<ImageType> FileWriteType;
FileWriteType::Pointer write = FileWriteType::New();
write->SetFileName(ss.str());
write->SetInput(cannyFilter->GetOutput());
try
{
write->Update();
}
catch (itk::ExceptionObject & err)
{
std::cerr << "ExceptionObject caught !" << std::endl;
std::cerr << err << std::endl;
viewer.Visualize();
return EXIT_SUCCESS;
}
}
Thank you for your help! 