模式识别课程作业——ＰＣＡ人脸识别

生成ｔｉｆｆ格式的文件：
参考博客http://blog.youkuaiyun.com/angelazy/article/details/50465058
http://cn.mathworks.com/help/matlab/import_export/exporting-to-images.html

ＰＣＡ人脸识别的基本原理http://blog.youkuaiyun.com/yutianzuijin/article/details/10823985
http://blog.youkuaiyun.com/haitao111313/article/details/7765023

ｍａｔｌａｂ中的ｐｃａ函数
http://www.voidcn.com/blog/qq1987924/article/p-4296144.html
http://blog.youkuaiyun.com/watkinsong/article/details/8234766
http://www.cnblogs.com/sunwufan/archive/2011/08/31/2159952.html