Edge detection using Fuzzy Logic

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I am trying to detect edge of gray scale image using fuzzy logic. In my code first I am trying to detect edge and then to remove noise. Edge detection part is working,but noise removal part have not worked. Edge detection pixels have values between 0 to 50 and background pixel values have constant value i.e. 128. In case of noise removal I put if else conditions . But each checked pixel i.e. z(i,j) satisfies only if condition whether it is true or not. Following is my code.........

 a=imread('a.jpg');
 g1=rgb2gray(a);
  g=imresize(g1,[200 200]);
 [m,n]=size(g);
 %figure, imshow(g)
%edge detection part
 t=readfis('edge.fis');
z=uint8(zeros(m,n));
for i=2:m-1
    for j=2:n-1
            F = [g(i-1,j-1) g(i-1,j) g(i,j-1) g(i,j)];
            h=double(F);
            z(i,j)=evalfis(h,t);
    end
end
disp(z)
figure, imshow(z)
%noise removal part
z2=uint8(zeros(m,n));
for i=2:m-1
    for j=2:n-1
            if ((0<=z(i-1,j-1)<=50) & (0<=z(i-1,j)<=50) & (0<=z(i-1,j+1)<=50) & (0<=z(i,j-1)<=50) & (0<=z(i,j)<=50) & (0<=z(i,j+1)<=50) & (0<=z(i+1,j-1)<=50) & (0<=z(i+1,j)<=50) & (0<=z(i+1,j+1)<=50))
   %      if z1(i-1,j-1)==0 && z1(i-1,j)==0 && z1(i-1,j+1)==0 && z1(i,j-1)==0 && z1(i,j)==0 && z1(i,j+1)==0 && z1(i+1,j-1)==0 && z1(i+1,j)==0 && z1(i+1,j+1)==0
           z2(i,j)=128;
        else 
             z2(i,j)=z(i,j);
        end
    end
end

figure, imshow(z2)

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matlab_image am 31 Mai 2012

hi Res,

I cant help you but i need ur help. i also want to do edge detection with fuzzy logic. but i don't know how to start. can you please suggest me something for writing fuzzy logic code.

Thanks in advance