摘要：本文提出了一种基于数字图像处理技术的表面裂纹检测算法。运用这种算法能精确的检测裂纹的位置、长度等特征。将这种裂纹检测算法运用到裂纹自动检测系统以及裂纹扩展行为监测中不仅大大降低了劳动时间和劳动强度，而且提高了测量的准确性。-Abstract : This paper presents a digital image processing technology of surface crack detection algorithm. Using this algorithm can detect the precise location of the crack length feature. Such use of crack detection algorithm to automatically detect cracks and crack propagation system monitoring behavior not only greatly reduce the labor time and labor intensity, but also improve the measurement accuracy.