[Insight-users] difference between get and getPixel

[Matt McCormick]

Hi pengpeng,

The first cast to unsigned char is overflowing - 179 = 435 -  256.

Hth,
Matt
On Aug 4, 2013 10:17 PM, "pengpeng" <helloliupengxin at gmail.com> wrote:

> Dear ITK Friend
>
> I want to get any position pixel value of 3D DICOM volume.
> But when I use iterator.get and getpixel, the results are different.
> The first one reads 179 while the second reads 435. Can anyone help?
> Thanks a lot.
>
> < iterator code >
>               InternalImageType::Pointer imageForI =reader->GetOutput();
>               InternalImageType::SizeType regionSize;
>               regionSize[0]=1;
>               regionSize[1]=1;
>               regionSize[2]=1;
>
>               InternalImageType::IndexType regionIndex;
>               regionIndex[0]=128;
>               regionIndex[1]=128;
>               regionIndex[2]=2;
>
>               InternalImageType::RegionType region;
>               region.SetSize(regionSize);
>               region.SetIndex(regionIndex);
>
>               itk::ImageRegionConstIterator<InternalImageType>
> imageIterator(imageForI,region);
>               while(!imageIterator.IsAtEnd())
>                 {
>                 unsigned char val = imageIterator.Get();
>                 std::cout <<" Pixel is "<< (int)val << std::endl;
>                 ++imageIterator;
>                 }
> < end iterator code >
> <getpixel code>
>              InternalImageType::IndexType pi={128,128,2};
>              std::cout<<"pixel is
> "<<reader->GetOutput()->GetPixel(pi)<<std::endl;
> &lt;end getpixel code>
>
>
>
>
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