Pointer meter positioning and reading algorithm based on dial plate feature

The invention provides a pointer meter positioning and reading algorithm based on dial plate features. Through SIFT characteristic matching, the dial plate positioning can adapt to rotation and scalechanges, meanwhile, the SIFT matching process is improved, abnormal points in matching are filtered out, and the dial plate positioning is more accurate. For a real pointer table type, the invention provides two pointer detection schemes, namely color-based pointer detection and scanning-based pointer detection. 本发明提供了一种基于表盘特征的指针表定位及读数算法，通过SIFT特征匹配，使表盘定位可以适应旋转和尺度变化，同时对SIFT匹配过程进行改进，过滤掉匹配中的异常点，使表盘定位更准确；针对现实指针表类型，本发明提出两种指针检测的方案，基于颜色的指针检测，基于扫描的指针检测。