[Insight-users] ITK 4.1 ImageIOFactory Could not create IO Object
Sebastian Losch
seb.losch at googlemail.com
Wed May 23 20:33:19 EDT 2012
hm seems that my png file is a jpeg in disguise. i have got no clue
where this could have happened. I've got it to work with another png
file. But now i have another issue, the resulting image is just black
(shoud be canny edges).
Am 24.05.2012 02:17, schrieb 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
> <mailto: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 <mailto: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 <tel:24.05.2012%2001>: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 <mailto: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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