[Insight-users] map the colours from the eigenvector

[Seth Gilchrist]

Hi alba,
What's the error?

Seth

On Mon, Feb 14, 2011 at 3:09 AM, alba garin <albagarin1986 at hotmail.com>wrote:

>  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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