[Insight-users] PLEASE HELP! 48 bit to 24 bit RGB Image conversion

[John Eke]

Hi,

I figured out that the itkVectorRescaleIntensityImageFilter requires a Vector as input, but for the output I could use my target which was an RGBPixel. Problem now though, the converted image comes out all black. Am I forgetting to set something? please look at the code below (it will run as is). All I want to do (as is obvious from the code below) is to convert a 48 bit RGB image to a 24 bit RGB image. The code below works, but the resulting image is pitch black. Please help any way you can

Thanks

John
-------------------------------------------------------------------------- 

#include "itkImage.h"
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
#include "itkResampleImageFilter.h"
#include "itkLinearInterpolateImageFunction.h"
#include "vtkImageActor.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkRenderWindow.h"
#include "vtkRenderer.h"
#include "itkSimilarity2DTransform.h"
#include "itkImageToVTKImageFilter.h"
#include "vtkCamera.h"
#include "itkImage.h"
#include "itkImageFileReader.h"
#include "itkImageToVTKImageFilter.h"
#include "itkVectorResampleImageFilter.h"
#include "itkSimilarity2DTransform.h"
#include "itkRGBPixel.h"
#include "itkVector.h"
#include "vtkRenderWindow.h"
#include "itkVectorRescaleIntensityImageFilter.h"
#include "itkVectorInterpolateImageFunction.h"


int main( int argc, char * argv[] )
{
	if (argc < 2)
	{
		cout<<"Please enter filename for a picture\n";
		return 0;
	}
  	const unsigned int Dimmension = 2;
	typedef itk::Vector<unsigned short>  InputPixelType;
	typedef itk::RGBPixel<unsigned char>  OutputPixelType;

	typedef itk::Image<InputPixelType, Dimmension> InputImageType;
	typedef itk::Image<OutputPixelType, Dimmension> OutputImageType;

	typedef itk::ImageFileReader<InputImageType>  ReaderType;
	ReaderType::Pointer reader = ReaderType::New();
	reader->SetFileName(argv[1]);

	typedef itk::ImageFileWriter<OutputImageType>  WriterType;
	WriterType::Pointer writer = WriterType::New();
	writer->SetFileName("convertedfile.png");

	typedef itk::VectorRescaleIntensityImageFilter<InputImageType, OutputImageType> RescaleFilterType;
	RescaleFilterType::Pointer rescaleFilter = RescaleFilterType::New();

	rescaleFilter->SetInput(reader->GetOutput());
	writer->SetInput(rescaleFilter->GetOutput());

	try 
	{
		writer->Update();
	}
	catch( itk::ExceptionObject & err ) 
	{ 
		std::cerr << "ExceptionObject caught !" << std::endl; 
		std::cerr << err << std::endl; 
		return 0;
	}
	cout<<"PROCESSING PASSED!"<<endl;	
  	return 0;
}


-----Original Message-----
From: Bill Lorensen [mailto:bill.lorensen at gmail.com]
Sent: Thu 6/5/2008 3:43 PM
To: John Eke
Cc: insight-users at itk.org
Subject: Re: [Insight-users] PLEASE HELP! RescaleIntensityImageFilter and Non Scalar Images
 
try itkVectorRescaleIntensityImageFilter

On Thu, Jun 5, 2008 at 2:45 PM, John Eke <johne at annidis.com> wrote:
> Hi,
>
> Could someone please show me how to read use the RescaleIntensityImageFilter
> with RGB Images? When I set an RGB image type (of type itk::RGBPixel<short
> unsigned int>) as input, I get lots of very confusing errors upon
> initializing the object:
>
>       const unsigned int Dimmension = 2;
>       typedef itk::RGBPixel<short unsigned int>  InputPixelType;
>       typedef itk::RGBPixel<unsigned char>  OutputPixelType;
>
>       typedef itk::Image<InputPixelType,  Dimmension>   InputImageType;
>       typedef itk::Image<OutputPixelType, Dimmension>   OutputImageType;
>
>       typedef itk::ImageFileReader<InputImageType>  ReaderType;
>
>       ReaderType::Pointer reader = ReaderType::New();
>
>       reader->SetFileName(path.toStdString().c_str());
>       typedef itk::RescaleIntensityImageFilter<InputImageType,
> OutputImageType> FilterType;
>       FilterType::Pointer filter = FilterType::New();   //ERROR OCCURS HERE
>
> What am I not doing right?
>
> Thanks
>
> John
> _______________________________________________
> Insight-users mailing list
> Insight-users at itk.org
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>

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