中文说明：主成分分析（PCA）是处理统计数据的有用工具。但它也可用于处理图像或信号。这个文件是表明它是如何工作的图像处理的领域中的演示。
English Description：
Principal Component Analysis ( PCA) is a useful tool to process statistic data. But it also could be used to process image or signals. this document is a demo that show how it works in the field of image process.