A New Fast Border Search Algorithm and Its Expansion

Because of high real-time requirement for an on-line surface inspection system, traditional algorithms cannot meet the requirement. According to border search theory, a new fast border-detection algorithm named Local Border Search Algorithm (LBSA) was presented here, and it can detect border of cold rolled strips as 10 times fast as traditional Gray Level Gradient Threshold Algorithm (GLGTA). However it is still short in some aspects and makes the algorithm can be only used in border searching of strips. In order to overcome shortages of the algorithm, it is improved and expanded in the paper, and after the expansion of Local Border Search Algorithm, it can be used to detect defects of cold rolled strips, and experimental results show that the speed is about 10 times faster and more accurate in defect detection than traditional defect detection algorithm. Therefore, it is suitable to be used in real-time detection occasions.