function?Result?=?RXD（HIM）
%?By?Yulei?Wang?（last?modified?on?03/18/2014）
%?RXD:?anomaly?detector
%???????RXD?performs?the?commonly?used?RX?anomaly?detector?based?on
%???????covariance?matrix
%???????This?funcion?is?a?global?RX?detector?in?which?covariance?matrix?is
%???????calculated?only?once?using?all?the?data?points
%?Usage:
%???Result?=?RXD（HIM）
%?Inputs:
%???HIM?-?3D?data?matrix?（XX*YY*bnd）?which?is?the?original?hyperspectral
%?????????imagery?data
%?Outputs:
%???Result?-?Detector?output?（XX*YY）

%?------------------------?RX?Algorithm?--------------------------------------
display（‘start?RXD?algorithm‘）;%顯示
t1?=?cputime;
[XXYYbnd]?=?size（HIM）;%?XX為圖像的長度?YY為圖像的高度?bnd為圖像的波段數
r?=?reshape（HIMXX*YYbnd）‘;%將HTM中各個像素點的像素值放入到r（行數bnd?列數xx*yy）矩陣中