介绍一种在激光热轧带钢板形测量系统中使用的图像检测系统。针对在生产中当带钢纵向温度辐射波动较大时，会造成被测图像大面积背景灰度的变化，影响图像分割与光斑提取，导致系统无法在线稳定测量的问题，提出了所谓门限化阈值跟踪的方法。该方法根据仪器设计的自适应原则，在线分析局部图像的直方图，预报图像分割所需的阈值，补偿带钢纵向温度的波动对图像灰度分布的影响，提高了检测系统的自适应性能。 An image inspection system used in laser hot strip shape measurement system is introduced. Aiming at the problem that when the temperature of strip longitudinal temperature fluctuates greatly in production, the grayscale changes will occur in the large area of ​​the measured image, affecting the image segmentation and spot extraction, resulting in the problem that the system can not be measured online. Tracking method. According to the principle of adaptive design, the method analyzes the histogram of local image online, predicts the threshold needed for image segmentation, compensates for the influence of the longitudinal temperature fluctuation on the image gray distribution, and improves the adaptive performance of the detection system.