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Components of these three unit vectors form the rotation matrix

             / eijx1   ey1    ez1 \

Rij =  |   ex2   ey2    ez2   |

             \  ex3   ey3    ez3 /

, where indexes "i" and "j" corresponds to the vector components in the setup and detector local coordinate frames, respectively. Within this definition 3-d pixel coordinate "c" in the detector frame can be transformed to the setup coordinate "C" using equation

                              Ci=eRij·cj + Pi.

 

 

Coordinate system of the detector

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