<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Most likely this is a problem with how you are using CMake for ITK and is not related to the code you have included here.<div><br></div><div>There is an example of what a basic CMake project which uses ITK should like like int ITK/Examples/Installation/CMakeLists.txt</div><div><br></div><div><a href="http://itk.org/gitweb?p=ITK.git;a=blob;f=Examples/Installation/CMakeLists.txt;h=5e1b9e7ae0a95430f5162e8ff435b98570c5ad6e;hb=HEAD">http://itk.org/gitweb?p=ITK.git;a=blob;f=Examples/Installation/CMakeLists.txt;h=5e1b9e7ae0a95430f5162e8ff435b98570c5ad6e;hb=HEAD</a></div><div><br></div><div>Hopefully, this will get you started in the right direction to solve you problem.</div><div><br></div><div>Brad<br><div><br></div><div><br><div><div>On May 22, 2012, at 4:35 AM, Sebastian Losch wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">Hi!<div><br></div><div>I am having problems getting the ImageFileReader and ImageFileWriter to work. I just want to read a PNG File, apply a filter and write it back to the harddrive. I found out that there is a problem in 4.1 with the ImageIOFactory registration, so i register the PNGFactory manually. The .png file is in the same folder as the executable. Here is my Code:</div>
<div><br></div><div><div>#include "itkImage.h"</div><div>#include "itkImageFileReader.h"</div><div>#include "itkImageFileWriter.h"</div><div>#include "itkCannyEdgeDetectionImageFilter.h"</div>
<div>#include "itkObjectFactoryBase.h"</div><div>#include "itkPNGImageIOFactory.h"</div><div><br></div><div>int main(int argc, char *argv[])</div><div>{</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>itk::ObjectFactoryBase::RegisterFactory(itk::PNGImageIOFactory::New());</div>
<div><br></div><div><br></div><div><span class="Apple-tab-span" style="white-space:pre"> </span>double variance = 2.0;</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>double upperThreshold = 0.0;</div>
<div><span class="Apple-tab-span" style="white-space:pre"> </span>double lowerThreshold = 0.0;</div><div><br></div><div><span class="Apple-tab-span" style="white-space:pre"> </span>typedef itk::Image<double, 2> DoubleImageType;</div>
<div><br></div><div><span class="Apple-tab-span" style="white-space:pre"> </span>typedef itk::ImageFileReader<DoubleImageType> ReaderType;</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>ReaderType::Pointer reader = ReaderType::New();</div>
<div><span class="Apple-tab-span" style="white-space:pre"> </span>reader->SetFileName("input.png");</div><div><br></div><div><span class="Apple-tab-span" style="white-space:pre"> </span>typedef itk::CannyEdgeDetectionImageFilter <DoubleImageType, DoubleImageType></div>
<div><span class="Apple-tab-span" style="white-space:pre"> </span>CannyEdgeDetectionImageFilterType;</div><div><br></div><div><span class="Apple-tab-span" style="white-space:pre"> </span>CannyEdgeDetectionImageFilterType::Pointer cannyFilter = CannyEdgeDetectionImageFilterType::New();</div>
<div><span class="Apple-tab-span" style="white-space:pre"> </span>cannyFilter->SetInput(reader->GetOutput());</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>cannyFilter->SetVariance( variance );</div>
<div><span class="Apple-tab-span" style="white-space:pre"> </span>cannyFilter->SetUpperThreshold( upperThreshold );</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>cannyFilter->SetLowerThreshold( lowerThreshold );</div>
<div><br></div><div><span class="Apple-tab-span" style="white-space:pre"> </span>typedef itk::ImageFileWriter<DoubleImageType> WriterType;</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>WriterType::Pointer writer = WriterType::New();</div>
<div><br></div><div><span class="Apple-tab-span" style="white-space:pre"> </span>writer->SetFileName("test.png");</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>writer->SetInput(cannyFilter->GetOutput());</div>
<div><br></div><div><span class="Apple-tab-span" style="white-space:pre"> </span>try {</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>writer->Update();</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>} catch (itk::ExceptionObject &e) {</div>
<div><span class="Apple-tab-span" style="white-space:pre"> </span>std::cerr << e << std::endl;</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>}</div><div><br></div><div><span class="Apple-tab-span" style="white-space:pre"> </span>std::cout << "ENDE" << std::endl;</div>
<div>}</div></div><div><br></div><div>and this is the error:</div><div><br></div><div><div>itk::ImageFileReaderException (0059E4A8)</div><div>Location: "void __thiscall itk::ImageFileReader<class itk::Image<double,2>,class itk::DefaultConvertPixelTraits<double> >::GenerateOutputInformation(void)"</div>
<div>File: c:\libs\itk\include\itk-4.1\itkimagefilereader.hxx</div><div>Line: 143</div><div>Description: Could not create IO object for file input.png</div><div> Tried to create one of the following:</div><div> PNGImageIO</div>
<div> You probably failed to set a file suffix, or</div><div> set the suffix to an unsupported type.</div></div><div><br></div><div><br></div><div>What am i doing wrong?</div><div><br></div><div>Thanks in advance, Sebastian</div>
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