[Insight-users] Image to world coordinates

[Dan Mueller]

Hi Vincent,

The following will convert an index in "image" coordinates to a
physical point in "world" coordinates:
    image->TransformIndexToPhysicalPoint( index, point );

This function is specified in Common/itkImageBase.h

HTH

Cheers, Dan

On 28 June 2010 09:48, Vincent Garcia <Vincent.Garcia at sophia.inria.fr> wrote:
> Hi all,
>
> When you read a medical image (let's say 3D), you have a 3D matrix
> containing image data and some information about the position/orientation of
> the image in the world coordinates. Given the image coordinates (i,j,k), I'd
> like to understand how to compute the corresponding world coordinates
> (x,y,z).
> I have access to some information from the itk::Image object:
>
> GetOrigin () : (vector) position of the first voxel in the world coordinates
> GetSpacing () : (vector) size of the voxels in mm
> GetDirection () : (matrix) direction cosine
>
> I've tried to search on the documentation but I haven't found the way to use
> these vectors and matrix to compute the world coordinates.
> The formula should be very simple but I just can't found it.
>
> Many thanks,
>
> Vincent Garcia
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