ROAPROEWA-algorithm 最为经典的ROA和ROEWA算子

最为经典的ROA和ROEWA算子，用于SAR图像边缘检测，并附有一定的实例图像，以说明实验结果。

a=imread（‘首尔L波段.bmp‘）;
% a=imread（‘seashore.bmp‘）;
X=1+double（a）/255*254;
[MN]=size（X）;
T1=0.2;
for i=1:M
    for j=1:N
        output（ij）=0;
        direction（ij）=0;
        r=[];
        if  i>4 & i4 &j            %angle 0
            u1=mean（X（i-4:i-2j））;
            u2=mean（X（i-1:i+1j））; 
            u3=mean（X（i+2:i+4j））;
            r12=1-min（u1/u2u2/u1）;
            r13=1-min（u2/u3u3/u2）;
            r=[rmin（r12r13）];
            %angle 22.5
            u1=mean（[X（i-4j-2）X（i-3j-2）X（i-2j-1）]）;
            u2=mean（[X（i-1j-1）X（ij）X（i+1j+1）]）;
            u3=mean（[X（i+2j+1）X（i+3j+2）X（i+4j+2）]）;         
            r12=1-min（u1/u2u2/u1）;
            r13=1-min（u2/u3u3/u2）;
            r=[rmin（r12r13）];
            %angle 

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2011-12-05 14:28  ROA绠楁硶浠ｇ爜\
     文件        2873  2011-07-05 15:59  ROA绠楁硶浠ｇ爜\roa.asv
     文件        2854  2011-07-07 09:29  ROA绠楁硶浠ｇ爜\roa.m
     文件       66614  2011-07-05 15:58  ROA绠楁硶浠ｇ爜\seashore.bmp
     文件       66616  2011-07-07 09:29  ROA绠楁硶浠ｇ爜\棣栧皵L娉㈡.bmp
     文件       66614  2011-06-29 03:14  ROA绠楁硶浠ｇ爜\棣栧皵L娉㈡9绫冲垎杈ㄧ巼.bmp
     目录           0  2011-12-05 14:28  ROEWA绠楀瓙\
     文件        2165  2011-07-11 14:24  ROEWA绠楀瓙\roewa.m
     文件       66614  2011-07-05 15:49  ROEWA绠楀瓙\seashore.bmp
     文件      263224  2011-07-11 14:24  ROEWA绠楀瓙\鍙板寳.bmp
     文件       66616  2011-07-07 09:30  ROEWA绠楀瓙\棣栧皵L娉㈡.bmp
     文件       66614  2011-06-23 04:40  ROEWA绠楀瓙\棣栧皵L娉㈡9绫冲垎杈ㄧ巼.bmp