[Insight-users] How to convert 3d image into 1D vector array......

[Habib Baluwala]

Thank you, Ivan and Victor and will try out both methods and use the
appropriate one  . And again thank you for the advice. 




Iván Macía wrote:
> 
> Hi Victor,
> 
>  
> 
> This is inefficient in ITK since GetPixel() provides random access to
> pixels. You should do this with image iterators. 
> 
>  
> 
> Simple example to copy pixels from one image to the other:
> 
>  
> 
> itk::ImageRegionConstIterator<ImageType> it( image,
> image->GetRequestionRegion() ); // const version is read only
> 
> itk::ImageRegionIterator<ImageType> oit( outputImage,
> image->GetRequestionRegion() ); // make sure region is the same and it is
> in
> memory
> 
>  
> 
> it.GoToBegin();
> 
> oit.GoToBegin();
> 
>  
> 
> while( !it.IsAtEnd() )
> 
> {
> 
>   oit.Set( it.Get() ); // copy pixel to output image
> 
>   ++it;
> 
>   ++oit;
> 
> }
> 
>  
> 
> or alternatively
> 
>  
> 
> for( it.GoToBegin(), oit.GoToBegin(); !it.IsAtEnd(); ++it, ++oit )
> 
>   oit.Set( it.Get() ); // do sth with ret value
> 
>  
> 
> All this is in the ITK Software Guide
> 
>  
> 
> Hope that helps
> 
>  
> 
> Iván
> 
>  
> 
>  
> 
>  
> 
>  
> 
> De: insight-users-bounces at itk.org [mailto:insight-users-bounces at itk.org]
> En
> nombre de Víctor Rodrigo
> Enviado el: miércoles, 27 de mayo de 2009 20:39
> Para: insight-users at itk.org
> Asunto: Re: [Insight-users] How to convert 3d image into 1D vector
> array......
> 
>  
> 
> Hello.
> 
> I don't know if is the best option, but you can do something like this:
> 
> 
> ImageType::SizeType size=image->GetLargestPossibleRegion().GetSize();
> ImageType::IndexType index;
> int i=0;
> int numVox=size[0]*size[1]*size[2];
> PixelType* img=new PixelType[numVox];
> for(index[2]=0;index[2]<size[2];index[2]++) {
>      for(index[1]=0;index[1]<size[1];index[1]++) {
>            for(index[0]=0;index[0]<size[0];index[0]++) {
>                 img[i++]=image->GetPixel(index);
>            }
>       }
> }
> 
> 
> 
>  
> 
> 
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