[ITK-users] Casting Point to SizeType and vice versa

[Dženan Zukić]

Hi Jonas,

what you probably need is TransformPhysicalPointToIndex
<https://itk.org/Doxygen/html/classitk_1_1ImageBase.html#af4a7c9c3787e9fdafbaaade2e02efa25>
method
or one of its friends.

Regards,
Dženan Zukić, PhD, Senior R&D Engineer, Kitware (Carrboro, N.C.)

On Sat, May 27, 2017 at 3:34 AM, Jonas Teuwen <jonasteuwen at gmail.com> wrote:

> Hi all,
>
> I want to extract patches around points using CropImageFilter. To do this,
> I need to calculate the correct bounds.
> The point itself is an itk::Point object, and then I calculate the
> lower_crop and upper_crop. It can be possible these are negative in some
> components, which is checked later on and compensated with
> ConstantPadImageFilter.
>
> So I need to switch between a Size and Point, which apparently cannot be
> implicitly casted.
> I am using a for loop to do this, but this is probably not the right way
> to do it. So what is the proper way to do this in ITK?
> I understand this question is probably very elementary, but your help
> would be greatly appreciated.
>
>   itk::Size<3> image_size = image->GetBufferedRegion().GetSize();
>   std::cout << "Input size: " << image_size << std::endl;
>
> *  itk::Vector<double, 3> image_size2;*
> *  for(int i=0; i<3; ++i)*
> *    {*
> *      image_size2[i] = image_size[i];*
> *    }*
>
>
>   itk::Vector<double, 3> lower_crop = point - crop_size;
>   itk::Vector<double, 3> upper_crop = image_size2 - (point + crop_size) -
> 1;
>
>
> Best,
> Jonas Teuwen
>
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