surface blemishes meaning in English

表面疵病
表面缺陷

Then used the non - parameter gauss background model to take rolled strips surface blemish is proved to be effective the gradient difference non - parameter gauss background mode subtraction algorithm and the frame difference non - parameter gauss background model subtraction algorithm utilizes were the first time to apply the cold - strip steel surface defect withdraws
并在非参数高斯背景模型相减算法中分别利用了图像梯度差非参数高斯背景模型相减算法和图像帧间差非参数高斯背景模型相减算法提取冷轧带钢表面缺陷。