基于扫描线的带钢低对比度缺陷图像分割技术：本文提出了基于扫描线阀值分割的方法，解决了在采用梯度算子对图像进行预处理存在的漏检问题。-Strip based on scan line defects in low-contrast image segmentation: In this paper, the threshold based on scan line segmentation method to solve the gradient operator in the use of the image pre-existing undetected problems.