是学习PCA特征提取的很好的学习资料，在matlab环境中自动识别连通区域的大小,对信号进行频谱分析及滤波，从先验概率中采样，计算权重，有详细的注释，具有丰富的参数选项。- Is a good learning materials to learn PCA feature extraction, Automatic identification in the matlab environment the size of the connected area, The signal spectra