[Insight-developers] ImageAdaptors and RGB images

[Luis Ibanez]

Hi Richard,

1) How is the type "pixtype" defined ?

2) What exactly are the error messages that you get from the concept check ?
     please post them to the list.


  Thanks


       Luis


-------------------------------
On Mon, Feb 21, 2011 at 6:08 PM, Richard Beare <richard.beare at gmail.com> wrote:
> Hi,
> I'm trying to take a difference between channels of an RGB image. The
> color accessor functors seem the appropriate way of doing it, but I'm
> running into problems with concept checks in the subtract filter.
>
> Am I making a stupid error with this code? Should I be using an
> alternative approach?
>
> Thanks
>
>  typedef typename itk::Image<pixtype, dim> RawImType;
>  typedef typename itk::Image<unsigned char, dim> MaskImType;
>  typedef typename itk::Image<short, dim> SignedImType;
>  typedef itk::RGBPixel<pixtype>   RGBPixelType;
>  typedef itk::Image<RGBPixelType, dim>    RGBImageType;
>
>  typename RGBImageType::Pointer raw = readIm<RGBImageType>(CmdLineObj.InputIm);
>
>
>  typedef typename itk::RedPixelAccessor<RGBPixelType> RedAccessorType;
>  typedef typename itk::GreenPixelAccessor<RGBPixelType> GreenAccessorType;
>  typedef typename itk::BluePixelAccessor<RGBPixelType> BlueAccessorType;
>
>  typedef typename itk::ImageAdaptor<RGBImageType, RedAccessorType>
> RedAdaptorType;
>  typedef typename itk::ImageAdaptor<RGBImageType, GreenAccessorType>
> GreenAdaptorType;
>  typedef typename itk::ImageAdaptor<RGBImageType, BlueAccessorType>
> BlueAdaptorType;
>
>  typename RedAdaptorType::Pointer RedAdaptor = RedAdaptorType::New();
>  typename GreenAdaptorType::Pointer GreenAdaptor = GreenAdaptorType::New();
>  typename BlueAdaptorType::Pointer BlueAdaptor = BlueAdaptorType::New();
>
>
>  RedAdaptor->SetImage(raw);
>  GreenAdaptor->SetImage(raw);
>  BlueAdaptor->SetImage(raw);
>
>  // blue - red selects cyan
>  // red - blue selects yellow
>
>  itk::Instance< itk::SubtractImageFilter< BlueAdaptorType,
> RedAdaptorType, SignedImType> > Difference;
>  Difference->SetInput(BlueAdaptor);
>  Difference->SetInput2(RedAdaptor);
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