采用决策融合策略, 提出了一种基于多模糊支持向量机( FSVM)的积雨云检测方法以解决添加更多的特征可增加云分类识别的准确率而特征维数过高又会造成过拟合现象的矛盾。该方法首先从训练云图提取光谱特征、通道亮温差特征、一阶灰度直方图纹理特征、灰度共生矩阵纹理特征以及Gabor小波特征, 并组成包含5类特征的训练样本集; 然后针对每类特征, 训练5个FSVM子分类器。最后对各子分类器的结果在输出空间进行加权决策融合, 以提高积雨云检测的准确率。实验结果表明, 本文方法不仅较好地解决了积雨云检测中由于特征维数过高而造成的过拟合现象, 而且能自适应地确定不同特征的权重, 检测准确率优于各FSVM子分类器和包含所有输入特征的单FSVM分类器, 有望在卫星云图分析中得到应用。

A cumulonimbus detection approach was proposed based on Multi Fuzzy Support Vector Machine(FSVM) by using a decision fusion strategy to solve the contradiction that adding more features will increase the accuracy of cloud classification while cause over fitting phenomenon due to high feature dimensions. Firstly, spectral features, the brightness temperature difference of multi-channels, first order histogram texture features, gray level co-occurrence matrix texture features and Gabor wavelet features were extracted from training cloud images to form a training sample set which contains 5 kinds of features. Then, five FSVM sub-classifiers were trained respect to each kind of feature. Finally, the output of each sub-classifier was fused by weighted decision in the output space to improve the detection accuracy of the cumulonimbus. Experimental results show that the proposed approach solves the over fitting phenomenon in cumulonimbus detection caused by the too high feature dimensions and can determine the weight of different features adaptively. The results also demonstrate that the accuracy is not only superior to each FSVM sub-classifier but also to the FSVM classifier trained by all the input features at once. The proposed approach is expected to be applied in the analysis of satellite cloud images.