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DecomposeProjectionMatrix clarification

Hi all,

Can someone please explain fully what the output of decomposeProjectionMatrix is?

I am giving it a 3x4 camera matrix, and I understand that the output is the intrinsic matrix, a 3x3 rotation matrix and a 4x1 translation vector. My questions are:

-Is the translation vector representing the position of the world origin in camera coordinates or visa versa? -To fully determine camera pose (i.e centre of perspective and the 'look in' direction of the camera) what would I need to do to the output matrices?

Thanks