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Hi Luis!<br>
<br>
Thanks for your response. As i wrote in my first post the .png file
is in the same folder as the executable, so that cannot be the
reason. When i change the filename to something different (e.g. to a
file which does not exists) then itk throws a different exception
(file not found). <br>
<br>
Sebastian<br>
<br>
Am 24.05.2012 01:40, schrieb Luis Ibanez:
<blockquote
cite="mid:CABAUzPonz0Rqza5TczGGMBLrLRGUinbj-4Hq76VdLkDv1j9+GQ@mail.gmail.com"
type="cite">Hi Sebastian,
<div><br>
</div>
<div>You are using a plain filename (instead of a full path)</div>
<div>to point to your image:</div>
<div><br>
</div>
<div>
<div><span style="white-space:pre-wrap"> </span>reader->SetFileName("input.png");</div>
<div><br>
</div>
<br class="Apple-interchange-newline">
The factories are telling you that the file</div>
<div><br>
</div>
<div> "input.png"</div>
<div><br>
</div>
<div>is not in the same directory that the executable </div>
<div>that you build with Visual Studio.</div>
<div><br>
</div>
<div><br>
</div>
<div>You may want to try one of these tree options:</div>
<div><br>
</div>
<div><br>
</div>
<div>1) Use a full path to point to your image,</div>
<div> something like:</div>
<div><br>
</div>
<div> C:\MyImages\input.png</div>
<div> </div>
<div>or</div>
<div> </div>
<div>2) Copy the image to where the executable is</div>
<div><br>
</div>
<div>or</div>
<div><br>
</div>
<div>3) Copy the executable to where the image is</div>
<div> and run the executable from that directory<br>
<br>
<br>
<br>
Option (1) is probably the best way to go.</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div>Ideally your code should have been:</div>
<div><br>
</div>
<div><br>
</div>
<div>A) If using a command line approach</div>
<div><br>
</div>
<div><span style="white-space:pre-wrap"> </span>reader->SetFileName(
argv[1] );<br class="Apple-interchange-newline">
</div>
<div> </div>
<div>or,</div>
<div><br>
</div>
<div>B) If using a GUI to get the filename from the user:</div>
<div><br>
</div>
<div> const char * filename = GetMeAFileNameFromGUI();</div>
<div><br>
<div><span style="white-space:pre-wrap"> </span>reader->SetFileName(
filename );<br class="Apple-interchange-newline">
</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div> Hope this helps,</div>
<div><br>
</div>
<div><br>
</div>
<div> Luis</div>
<div><br>
</div>
<div><br>
</div>
-----------------------------------------<br
class="Apple-interchange-newline">
<div class="gmail_quote">On Tue, May 22, 2012 at 4:35 AM,
Sebastian Losch <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:seb.losch@googlemail.com" target="_blank">seb.losch@googlemail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
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 style="white-space:pre-wrap"> </span>itk::ObjectFactoryBase::RegisterFactory(itk::PNGImageIOFactory::New());</div>
<div><br>
</div>
<div><br>
</div>
<div><span style="white-space:pre-wrap"> </span>double
variance = 2.0;</div>
<div><span style="white-space:pre-wrap"> </span>double
upperThreshold = 0.0;</div>
<div><span style="white-space:pre-wrap"> </span>double
lowerThreshold = 0.0;</div>
<div><br>
</div>
<div><span style="white-space:pre-wrap"> </span>typedef
itk::Image<double, 2> DoubleImageType;</div>
<div><br>
</div>
<div><span style="white-space:pre-wrap"> </span>typedef
itk::ImageFileReader<DoubleImageType> ReaderType;</div>
<div><span style="white-space:pre-wrap"> </span>ReaderType::Pointer
reader = ReaderType::New();</div>
<div><span style="white-space:pre-wrap"> </span>reader->SetFileName("input.png");</div>
<div><br>
</div>
<div><span style="white-space:pre-wrap"> </span>typedef
itk::CannyEdgeDetectionImageFilter <DoubleImageType,
DoubleImageType></div>
<div><span style="white-space:pre-wrap"> </span>CannyEdgeDetectionImageFilterType;</div>
<div><br>
</div>
<div><span style="white-space:pre-wrap"> </span>CannyEdgeDetectionImageFilterType::Pointer
cannyFilter = CannyEdgeDetectionImageFilterType::New();</div>
<div><span style="white-space:pre-wrap"> </span>cannyFilter->SetInput(reader->GetOutput());</div>
<div><span style="white-space:pre-wrap"> </span>cannyFilter->SetVariance(
variance );</div>
<div><span style="white-space:pre-wrap"> </span>cannyFilter->SetUpperThreshold(
upperThreshold );</div>
<div><span style="white-space:pre-wrap"> </span>cannyFilter->SetLowerThreshold(
lowerThreshold );</div>
<div><br>
</div>
<div><span style="white-space:pre-wrap"> </span>typedef
itk::ImageFileWriter<DoubleImageType> WriterType;</div>
<div><span style="white-space:pre-wrap"> </span>WriterType::Pointer
writer = WriterType::New();</div>
<div><br>
</div>
<div><span style="white-space:pre-wrap"> </span>writer->SetFileName("test.png");</div>
<div><span style="white-space:pre-wrap"> </span>writer->SetInput(cannyFilter->GetOutput());</div>
<div><br>
</div>
<div><span style="white-space:pre-wrap"> </span>try {</div>
<div><span style="white-space:pre-wrap"> </span>writer->Update();</div>
<div><span style="white-space:pre-wrap"> </span>} catch
(itk::ExceptionObject &e) {</div>
<div><span style="white-space:pre-wrap"> </span>std::cerr
<< e << std::endl;</div>
<div><span style="white-space:pre-wrap"> </span>}</div>
<div><br>
</div>
<div><span style="white-space:pre-wrap"> </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>
<br>
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</blockquote>
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</blockquote>
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