Research of reading system of the pointer instrument based on embedded system

With the rapid change of society and the continuous development of science and technology, the application of instruments is more and more widely in all kinds of places from daily life to chemical power and aerospace. The pointer instruments in traditional industries are still widely used. But without changing the original equipment structure, the intelligent transformation is still an urgent research direction. The object of this paper is a kind of pointer pressure instrument used in industry. The purpose of this paper is to research the reading system of the pointer instrument based on embedded hardware platform and simple software algorithm. This paper designs an automatic reading system of the value indicated by the dial of the pointer instrument. The system uses embedded hardware devices and adopts the design idea of Linux + Qt + OpenCV. An open source, cross platform and relatively simple image processing algorithm is designed in it. Canny Edge detection, Hough-Circles detection and the Hough-Lines detection are combined in it.