[Insight-users] Problems creating image from raw data

[Dženan Zukić]

Inside the convert procedure, your "output" image is just a procedure-local
copy of the image structure.

Instead of this:
 *pimg = importFilter->GetOutput();
You should do something like this:
pimg->Graft(importFilter->GetOutput());

A simple example of what you were doing is:
void square(int in, int out)
{
  out=in*in;
}
And when the function is called a value is copied to local parameter "out",
and whatever you do with it is not reflected on the original variable.

2011/7/27 Stefan König <stefankoenig at gmail.com>

> Hello,
>
> i've got a big problem, while i'm trying to convert picture data from
> raw data:
>
> i'm doing it, way if found in this mailing list, but it wont work for
> me, allways getting a null pointer exception.
>
> thats the way i tried:
>
>        boost::gil::rgb8_image_t gimg(800,600);
>
>  boost::gil::jpeg_read_and_convert_image("C:\\Bilder\\Sonnenuntergang.jpg",
> (gimg));
>
>        typedef itk::RGBPixel<unsigned char> Pixels;
>        typedef itk::Image<Pixels, 2> RGBImage;
>
>   RGBImage::Pointer img;
>   void * pimg = &img;
>   convertGILtoItkImage<Pixels>(gimg, pimg);
>
>
> and now, what im doing in convertGILtoItkImage(..)
>
>        dstPixelType *localBuffer = (dstPixelType*) data;
>
>        int bythelength = width*height*numChannels;
>        dstPixelType * localBuffer2 = new dstPixelType[ width*height ];
>
>        // copy buffer from gil image to new buffer, which will be owned by
> itk
> image
>        memcpy(localBuffer2, localBuffer, bythelength);
>
>        // if set to true, itk will do memory managment
>        const bool importImageFilterWillOwnTheBuffer = true;
>        importFilter->SetImportPointer( localBuffer2, size[0]*size[1],
> importImageFilterWillOwnTheBuffer );
>        importFilter->Update();
>
>        *pimg = importFilter->GetOutput();
>
>
>        // hier geht alles, bild ist vorhanden wir geschrieben... kimg
> bekommt
> irgendwoher nen desktruktoraufruf der alles kaputt macht :(
>        typedef itk::ImageFileWriter<ImageType>  WriterType;
>        WriterType::Pointer writer = WriterType::New();
>        writer->SetFileName("C:\\checkWriteInMethod11.jpg");
>        writer->SetInput(*pimg);
>        try
>        {
>                writer->Write();
>        }
>        catch( itk::ExceptionObject & err )
>        {
>                qDebug() << "ExceptionObject caught !";
>                qDebug() << err.what();
>        }
>        return  pimg->GetPointer()->Register();
> ---------------------------------------------------------
>
> if i write out my picture inside the conversion method, everything works
> fine, but if i try to write it out it outside the method, i'm getting a
> null pointer exception.
>
> but i've no idea why?
>
> can somebody help me?
>
> regards
> Stefan
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