At a party, he instructed a Royal Air Force pilot to remove the bulb from a light fitting and place it in a flowerpot, on hearing the word Germany.

In the part of vision system design, the hardware platform is composed of linear array light, cylindrical lens and linear array image sensor, then the algorithm of circle fitting method is carried on.

In the light of the question of the relation between the sensor's linearity and fitting straight line, this paper builds mathematical model.