[Insight-developers] question regarding direction cosines

[Kent Williams]

Direction Matrix is NxN where N is the number of dimensions in the 
image.  In general, only the first 3 directions have any spatial 
meaning, and 3D images are the most common by far.

I'd suggest setting the direction matrix to identity, and then filling 
in the X,Y,Z (0,1,2) columns with the direction cosines representing the 
3D orientation -- basically the upper left 3x3 of the matrix.  Anyone 
else have a suggestion?

Leila baghdadi wrote:

>Hi guys
>
>I am writing ImageIO classes for our specific file format (minc2) which
>is like itk N-dimensional,
>
>I am a bit confused about how to create a correct matrix for direction
>cosines,
>
>suppose I have an image with the following
>
>u,x,r,y,w,z
>
>so direction cosines are only for x,y,z
>
>the question is what is the correct way to create m_Direction of
>itkImageIOBase.*
>
>do I create a matrix (6x3) where I have (0,0,0) (1,0,0) (0,0,0) 
>
>or basically how do you carry the correct index for the spatial
>dimensions,
>
>Hopefully my question is clear if not please let me know
>
>Thanks
>
>Leila
>
>
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