Research on Automatic Recognition Algorithm of Pointer Meter Based on Machine Vision

Pointer meters can directly reflect the changing trend of measured values, so they are widely used in industry field measurements. The digital reading of pointer meters is conductive to real-time data monitoring and management. The paper firstly describes the structural characteristics of the pointer meter, and briefly describes the preprocessing algorithm of the meter picture, and then uses the algorithm to complete the position of the dial and the pointer location relative to the dial. The pointer positioning is achieved by monitoring the edges on both sides of the pointer. Finally, the pointer reading is determined according to the position of the pointer scale relative to the minimum scale. The algorithm is not affected by the tilt of the dial, and the final recognition accuracy is one-fifth of the smallest scale.