Research on automatic recognition of tolerance in shape and relative position in engineering drawings
机械工程图中形位公差符号的自动识别技术研究

According to the characteristics of tolerance in shape and relative position in engineering drawings,a new vector-based recognition algorithm based on key graphics characteristics and label character was proposed and implemented.This algorithm consisted of three main steps: firstly finding the key components,secondly searching other components according to the specific graphic syntax,thirdly judging the validity by characters.Experiment results indicate that this algorithm has powerful adaptability and high recognition.