是学习PCA特征提取的很好的学习资料，旋转机械二维全息谱计算的实用例程，包括压缩比、运行时间和计算复原图像的峰值信噪比。- Is a good learning materials to learn PCA feature extraction, Rotating Machinery dimensional hologram of practical spectrum calculation routines, Including compression ratio, image restoration computing uptime and peak signal to noise ratio.