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

[Sebastian Losch]

Hi Luis,

 i attached the .png file to this email. It's a beauitiful picture of
myself, shot with a cheap webcam ;)

Thanks, Sebastian

2012/5/24 Luis Ibanez <luis.ibanez at kitware.com>

> 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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