[Insight-users] map the colours from the eigenvector

[alba garin]

Hi again,
the problem is that i got an error at doing itRGB.Set(rgbPixel).why is that happening?Thanks,





From: albagarin1986 at hotmail.com
To: seth at mech.ubc.ca; insight-users at itk.org
Date: Mon, 14 Feb 2011 07:52:29 +0000
Subject: Re: [Insight-users] map the colours from the eigenvector









Thanks, I needed to save each component in RGB pixels so your pseudo code is useful. 





From: seth at mech.ubc.ca
Date: Fri, 11 Feb 2011 13:25:25 -0800
Subject: [Insight-users] map the colours from the eigenvector
To: insight-users at itk.org; albagarin1986 at hotmail.com

Hi Alba,
I'm not sure if I understand, is it the magnitude that you want mapped or the direction?  You can use ParaView to create visualizations of both from an image of vectors, and that my be the best way to go.  ParaView makes some very pretty pictures!



If you want to save each component of the vector to the components of an RGB pixel, you could use iterators to move through the image and save each component of the eigenvector to an RGB pixel as in the following pseudo code (more details in the Software Guide, page 738 on).



RBGIteratorType itRGB(rbgImage, vectorImage->GetLargestPossibleRegion());
ConstVectorIteratorType constItVec(vectorImage, vectorImage->GetLargestPossibleRegion());

for ([the whole region])
{
   VectorImageType::PixelType currentVectorPixel = constItVec.Get();


   
   RGBImageType::PixelType currentRGBPixel;
   currentRGBPixel->SetBlue(currentVectorPixel[0]); // make sure your vector component type and pixel type match
   currentRGBPixel->SetGreen(currentVectorPixel[1]);  // you will also want to normalize your vector components by the largest in the image. 


   currentRGBPixel->SetRed(currentVectorPixel[2]);
   
   itRGB.Set(currentRGBPixel);
}


 		 	   		  

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