[Insight-users] ITK 4.1 ImageIOFactory Could not create IO Object

[Luis Ibanez]

Hi Sebastian,

Could you please send me that .png file ?

   Thanks


        Luis


-----------------
On Wed, May 23, 2012 at 7:47 PM, Sebastian Losch
<seb.losch at googlemail.com>wrote:

>  Hi Luis!
>
> 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).
>
> Sebastian
>
> Am 24.05.2012 01:40, schrieb Luis Ibanez:
>
> Hi Sebastian,
>
>  You are using a plain filename (instead of a full path)
> to point to your image:
>
>   reader->SetFileName("input.png");
>
>
> The factories are telling you that the file
>
>                    "input.png"
>
>  is not in the same directory that the executable
> that you build with Visual Studio.
>
>
>  You may want to try one of these tree options:
>
>
>  1) Use a full path to point to your image,
>      something like:
>
>                 C:\MyImages\input.png
>
> or
>
> 2) Copy the image to where the executable is
>
>  or
>
>  3) Copy the executable to where the image is
>     and run the executable from that directory
>
>
>
> Option (1) is probably the best way to go.
>
>
>
>  Ideally your code should have been:
>
>
>  A) If using a command line approach
>
>  reader->SetFileName( argv[1] );
>
> or,
>
>  B) If using a GUI to get the filename from the user:
>
>        const char * filename = GetMeAFileNameFromGUI();
>
>  reader->SetFileName( filename );
>
>
>
>     Hope this helps,
>
>
>          Luis
>
>
>  -----------------------------------------
> On Tue, May 22, 2012 at 4:35 AM, Sebastian Losch <seb.losch at googlemail.com
> > wrote:
>
>> Hi!
>>
>>  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:
>>
>>  #include "itkImage.h"
>> #include "itkImageFileReader.h"
>> #include "itkImageFileWriter.h"
>> #include "itkCannyEdgeDetectionImageFilter.h"
>> #include "itkObjectFactoryBase.h"
>> #include "itkPNGImageIOFactory.h"
>>
>>  int main(int argc, char *argv[])
>> {
>>  itk::ObjectFactoryBase::RegisterFactory(itk::PNGImageIOFactory::New());
>>
>>
>>  double variance = 2.0;
>>  double upperThreshold = 0.0;
>>  double lowerThreshold = 0.0;
>>
>>  typedef itk::Image<double, 2>  DoubleImageType;
>>
>>  typedef itk::ImageFileReader<DoubleImageType> ReaderType;
>>  ReaderType::Pointer reader = ReaderType::New();
>>  reader->SetFileName("input.png");
>>
>>  typedef itk::CannyEdgeDetectionImageFilter <DoubleImageType,
>> DoubleImageType>
>>  CannyEdgeDetectionImageFilterType;
>>
>>  CannyEdgeDetectionImageFilterType::Pointer cannyFilter =
>> CannyEdgeDetectionImageFilterType::New();
>>  cannyFilter->SetInput(reader->GetOutput());
>>  cannyFilter->SetVariance( variance );
>>  cannyFilter->SetUpperThreshold( upperThreshold );
>>  cannyFilter->SetLowerThreshold( lowerThreshold );
>>
>>  typedef itk::ImageFileWriter<DoubleImageType> WriterType;
>>  WriterType::Pointer writer = WriterType::New();
>>
>>  writer->SetFileName("test.png");
>>  writer->SetInput(cannyFilter->GetOutput());
>>
>>  try {
>>  writer->Update();
>>  } catch (itk::ExceptionObject &e) {
>>  std::cerr << e << std::endl;
>>  }
>>
>>  std::cout << "ENDE" << std::endl;
>> }
>>
>>  and this is the error:
>>
>>  itk::ImageFileReaderException (0059E4A8)
>> Location: "void __thiscall itk::ImageFileReader<class
>> itk::Image<double,2>,class itk::DefaultConvertPixelTraits<double>
>> >::GenerateOutputInformation(void)"
>> File: c:\libs\itk\include\itk-4.1\itkimagefilereader.hxx
>> Line: 143
>> Description:  Could not create IO object for file input.png
>>   Tried to create one of the following:
>>     PNGImageIO
>>   You probably failed to set a file suffix, or
>>     set the suffix to an unsupported type.
>>
>>
>>  What am i doing wrong?
>>
>>  Thanks in advance, Sebastian
>>
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>
>
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