Angle recognition of pointer meter based on pan-tilt
Xin Gang Song, Zeming Wang · 2022
Pointer meters are widely used in industrial production, and it is very important to read the position of instrument pointer accurately for monitoring the running state of equipment. In view of the type of pointer meters and the environment of the factory, a method of detection of the angle of the pointer meter using the two-dimensional pan-tilt is proposed. First of all, the image pre-processing part meant to reduce the degree of interference, and then the use of Hough circle detection to find the position of dial, according to this position and the size of the image turn the pan-tilt and zoom. After the end, the image by bit and operation will be removed outside the dial, and then use Hough line detection to obtain all the lines in the image, through the distance between the straight line and the center of the circle to filter out the pointer, and finally according to the coordinates of the pointer to calculate the angle. The results show that compared with other methods, this method allows a certain distance and angle between the image acquisition device and the pointer meters, reduces the requirement of image acquisition, and successfully eliminate other interference information by bit and operation method, reduces the operating burden of the algorithm and improves the accuracy.