In order to reduce the measuring error of automatic detection systems, it is needed to adjust the nonlinear error for automatic detection systems.

Using the grating displacement transducer for measuring end circular run-out error during the pellet rotation course droved by a rotation stage, the system realized the pellet automatic detection.

The related researches of vanishing point have been focusing on its automatic detection and camera calibration for a long time, however there were few researches on its error distribution.