The linear laser beam is projected on the surface of continuous cast billets vertically; the images of laser beam on the billet are captured by a CCD area-scan camera and then laser strips are extracted from the images.

• 将线型激光线垂直投射到连铸方坯表面,利用面阵CCD摄像机采集激光线在方坯表面的图像,从图像中提取激光线条。