一种指针式仪表的识别方法

A method for reading recognition of index-instrument

当前指针式仪表识别技术日益成熟,其中指针形状和位置的识别大多采用Hough变换算法,传统的Hough变换算法运算时间长、储存空间大,使得识别过程效率低下。针对以上缺点,提出一种改进型Hough变换。通过限定指针式仪表表盘环形区域、运用差影法确定指针的大致区域、指针通过表盘圆心这三个限制条件来缩减Hough变换扫描的范围,以此缩减Hough变换算法的存储空间和计算量。将改进型Hough变换算法与传统的Hough变换算法相比较,实验结果表明:改进型Hough变换可有效地减少算法运行时间,提高指针仪表识别的实时性。

Current identification of index-instrument technique is getting mature,the recognition method of shape and position almost is Hough transform,but disadvantages of the large storage space and the long calculating time make the recognition process inefficient. In view of the above disadvantages,this paper proposed an improved Hough transform. By constraining the pointer instrument dials ring area,using the image subtraction algorithm determined broadly regional,the pointer through the dial the center,by these three restrictions to reduce the scope of the Hough transform scanned. Improved Hough transform algorithm compared with the classical Hough transform algorithm,experimental resualts show that the improved method can effectively reduce the running time of the algorithm of Hough transform,enhance pointer instrument recognition in real-time.