The moving track detection of elevator governor flyweight based on image recognition

Four ring-shaped visual signs to calculate the flyweight´s moving angle ware sticked on elevator governor. An encoder´s pulse counts ware used to trigger the high-speed camera´s shooting and it´s pulse periods to record the linear velocity of elevator governor when shooted. After that, image recognition was done on the four visual signs, in order to determine the angle of the four signs by geometrical principle. On that curve fitting of the speed was done and we got the trajectory of the flyweight. The results indicate that the correct rate can be stabilized at 97% or more.