Automatic Reading System based on Automatic Alignment Control for Pointer Meter

In view of the defects of recognition value of the existing high precision pointer meter, we developed a set of system of automatic reading based on automatic alignment control for pointer meter. We transformed the existing operating table, added to a set of system of camera automatic alignment, and accomplished the camera aimed automatically based on machine vision. Regarding recognition value, we improved the traditional distance method, meanwhile, expanded the scale mark and pointer through converting polar coordinate, and transformed angle method in original image into the distance method in polar coordinate plane, so it is more accurate for recognition value as per the position relationship between pointer and adjacent scale marks. This system indicates much higher accuracy and flexibility, while ensuring reliability, reduced the manual intervention and avoided misreading.