›› 2013, Vol. 26 ›› Issue (10): 10-.

• Articles • Previous Articles     Next Articles

Pointer Instrument Image Recognition Based on Priori Characteristics of Instrument Structure

NI Gang,YAN Bin   

  1. (School of Automation engineering,University of Electronic Science and Technology of China,Chengdu 611731,China)
  • Online:2013-10-15 Published:2013-10-23


In view of the fact that the pointer positioning is prone to interference by pointer instrument image recognition method,an improved pointer algorithm is proposed based on Canny edge operator and Hough line detection with the center of rotation and the radius of the dial as priori characteristics.With the center of rotation as the midpoint and the dial diameter as the side length,the square region of interest is extracted in order to reduce the duration of action of the Canny operator,followed by a comparison between all the straight lines after the Hough transform and structural characteristics to exclude the lines that do not meet the distance and position requirements.Finally,based on the Canny edge operator characteristics,the error of numerical calculation are analyzed and corrected.

Key words: pointer meter;structure characteristics;Canny edge;Hough line transform

CLC Number: 

  • TP391.41