function?y?=?gam_noise_gen（M?ALPHAABflag）

%%%%%%%%%%%%%%%??獲得均值?=M?有效視數?=ALPHA??的Gamma?Noise%%%%%%%%%%%%
%input:??M???????均值
%????????ALPHA???有效視數?對應Matlab函數[meanvar]?=?Gamstat（AB）函數的參數A：形狀參數
%????????????????B:var即方差.???????均值＝A×B；方差＝A×B^2。從而可以從A和B換算出mean?var。
%???????????????????????????????????????????????????
%????????A???????矩陣行數
%????????B???????矩陣列數
%output:?y???????A×B大小的，服從Gamma分布的噪聲矩陣

?

t?=?1:1:A*B;
size_t?=?length（t）;?
if?flag==0??????????????????????????%flag為0?代表產生的是幅度噪聲???????????????????????
???ALPHA=ALPHA/（4/pi-1）;
end
%%常數%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%ALPHA?=?4.0;???????%代表有效視數L?為保證Mean?=1?一般VAR?=?ALPHA
%M?=?2;

%%計算準備%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Gamma_nosie?=?zeros（1size_t）;


%%計算%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件?????151199??2005-09-11?15:44??生成SAR圖像程序\lena.png

?????文件?????350245??2010-10-12?18:05??生成SAR圖像程序\lena_6a.mat

?????文件?????263222??2010-10-12?18:05??生成SAR圖像程序\lena_6a.bmp

?????文件?????339579??2010-10-12?10:38??生成SAR圖像程序\lena_15a.mat

?????文件?????263222??2010-10-12?10:38??生成SAR圖像程序\lena_15a.bmp

?????文件?????344393??2010-10-12?11:44??生成SAR圖像程序\lena_10a.mat

?????文件?????263222??2010-10-12?11:44??生成SAR圖像程序\lena_10a.bmp

?????文件???????1565??2010-09-29?10:54??生成SAR圖像程序\gam_noise_gen.m

?????文件????????402??2010-09-29?10:59??生成SAR圖像程序\synthetic_sar.m

?????目錄??????????0??2011-02-23?13:15??生成SAR圖像程序

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??????????????1977049????????????????????10