sbs.m

一个用matlab写的特征挑选

%----4.17编 顺序后退法特征选择 
clear;
clc;
%--------特征导入  请自行修改
A=imread('lsy1.gif');
[M N]=size(A);
load coourfeature_0414_lsy1 %%%共生矩阵 96.14％
feature{1}=coourfeature(:,1);
feature{2}=coourfeature(:,2);
feature{3}=coourfeature(:,3);
load fuwavefeature_0413_lsy1 %%复小波  98.26％
for i=1:13
    feature{3+i}=wavefeature(:,i);
end
load wavefeature_0413_feixia_lsy1%%%非下采样小波  97.58％
for i=1:7
    feature{16+i}=wavefeature(:,i);
end
load wavefeature_0417_lsy1%%小波 97.65％
for i=1:7
    feature{23+i}=wavefeature(:,i);
end
%%%%%%%----------归一化-归一化
[m n]=size(feature{1});
for j=1:30%一共30组特征 这里 请自行修改
    mx=max(feature{j});
    mi=min(feature{j});
    mxx=(mx-mi);
    mii=ones([m n])*mi;
    feature{j}=(feature{j}-mii)./mxx;
end
%%---------------SBS  
chosen=[];dele=[];
for i=1:30
    chosen=[chosen i];
end

for j=1:24   %%删10个,留20个
    J=zeros([1 30]);ii=0;  %J(1)是删1的结果,J(2)是删除2 的结果......
    for i=1:30  %???dele 是必要的么???????????????????????%一共30组特征 这里 请自行修改
       
    [mm nn]=size(chosen);
      for p=1:nn
          if sum(i==dele)~=0
              J(i)=0;
              break;
          else
              for q=1:nn    
                  if (chosen(q)~=i) & (chosen(p)~=i)             
                    J(i)=J(i)-sum(sum((feature{chosen(q)}-feature{chosen(p)}).^2));  
                  end
              end
          end
      end
    end
     mi=min(J);
     for cc=1:30
         if J(cc)==0
             J(cc)=mi;
         end
     end
     [ma we]=max(J);
      dele=[dele we];
      for dd=1:nn
          if chosen(dd)==we
              chosen(dd)=[];
            
      end
  
end
% chosen=[2 4 5 6 7 8 9 11 12 13 14 19 20 22 23 26 27 28 29 30];
[mm nn]=size(chosen);
tezh=[];
for i=1:nn
    tezh=[tezh feature{chosen(i)}];
end
%%%%%%%%聚类
[IDC,U]=kmeans(tezh,2);
       cc(IDC==1,1)=0;
       cc(IDC==2,1)=0.75;
g=reshape(cc,M,N); 
 figure,imshow(g);
%%%%%%%%%%%%计算正确率
ju=ones(M)*0.75;
for i=1:M
    for j=1:M/2
        ju(i,j)=0;
    end
end
ju2=g-ju;
 prob=prod(size(find(ju2~=0)))/(m*n)
 1-prob