Principal Component Analysis. Very important for pattern recognition(ie. optical character recognition) A great fundamental file for the beginner. Even those who doesn t know what is variance can start learning about OCR basics from this pdf.-Princip

基于PCA的手写数字识别源码，内附有说明文件，非常清晰！运行环境：matlab。(Handwritten digital character recognition based on PCA and BP network)