The Design Of Pointer Instrument Identification Based On Image Processing

With the development of the electronic technology, the digital reading of the pointer instrument is becoming the hotspot. This paper proposes a technical scheme of pointer instrument digital reading based on image processing. It can replace human's eyes to pointer instrument for verification and readings. It improves the veracity and efficiency, reduces artificial repetitive work.The paper firstly introduces the knowledge of image processing which is interrelated with pointer instrument identification. It includes RGB and YUV color space model, gray image, the image preprocessing method, edge detection and the principle of Hough transform. Furthermore, the algorithm simulation is made on the MATLAB software platform.According to the introduction of image processing, Visual DSP++ for development environment and on Blackfin533 EZ - KIT, the paper puts forward to the design on which Sobel edge detection and a partition Hough transform to detect linear as the core. It introduces in detail the implement process, flow charts and implementation program code of the gray image conversion, image denoising and edge detection and Hough transform. Finally the rationality and validity of the design contents are proved by the simulation analysis. The results show that the algorithm can accurately identify dials readings and meet the design requirements.