Aiming at the characteristic in feature extraction of cold steel strip surface defect images, a mixed feature extraction method of separable criterion based on class distance is proposed.

针对冷轧带钢表面缺陷图像特征提取的特点，提出了基于类距离可分离性判据的混合特征提取方法。

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In this paper, the method for the optimal gray threshold is given, which is based on the maximum class separation distance criterion of pattern recognitive decision theory.

利用基于模式识别决策理论的最大类间距准则，给出了求解最佳分割灰度门限的方法。

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