这是一个金属表面划痕检测的程序，编程语言为C，基于阈值分析算法，可以用来检测金属划痕，撞伤(This is a metal surface scratch detection procedures, programming language for C, based on threshold analysis algorithm, can be used to detect metal scratches, bruises)

检测出图像表面的两道最明显的划痕，不能有其他干扰(The two most obvious scratches on the surface of the image are detected, and there is no other interference.)