As the position and size of the defects can not be forecasted, a method based on the knowledge to detect defects pixel monotonically and a method to judge the defect region are proposed.

• 鉴于坏损出现位置、大小等因素的不可预测性，提出了一种基于知识的坏损点单调检测方法以及坏损区域判别方法。