中文说明：代码里有很完整的注释和解释，是学习PCA特征提取的很好的学习资料，在MATLAB中求图像纹理特征，关于神经网络控制，添加噪声处理，抑制载波型差分相位调制。
English Description：
Very complete the comment in the code and explained that PCA is learning good study material feature extraction, image texture feature in MATLAB, on neural network control, add noise, suppressed carrier difference phase modulation.