xcorr 2 max indexes

hi i want to find the max index of corner i do 2 times xcorr 2 in the left i have good index while in the right not

*

a=imread('filename000.jpg');
  b=im2bw(a);
  borg=b;
  se0=strel('line',5,0);
  se1=strel('line',5,90);
  bdil=imdilate(imdilate(b,se0),se1);
  stats=regionprops(bdil,'MajorAxisLength','MinorAxisLength','FilledArea','PixelIdxList','PixelList');

        MajorAxisLength =  [stats.MajorAxisLength];
        MinorAxisLength =  [stats.MinorAxisLength];
        FilledArea  = [stats.FilledArea];
       % PixelIdxList = [stats.PixelIdxList];
      % PixelList   =[stats.PixelList];

        medMajorAxisLength = median(MajorAxisLength);
        medMinorAxisLength = median(MinorAxisLength);
        medFilledArea = median(FilledArea);

         maxMajorAxisLength = max(MajorAxisLength);
        maxMinorAxisLength = max(MinorAxisLength);
        maxFilledArea = max(FilledArea);

        idxAxisMajor = find(MajorAxisLength<0.5*(medMajorAxisLength+maxMajorAxisLength));
         idxAxisMinor = find(MinorAxisLength<0.5*(medMinorAxisLength+maxMinorAxisLength));
         idxArea        = find(FilledArea<0.5*(medFilledArea+maxFilledArea));

        idxEliminate = union(union(idxAxisMajor,idxAxisMinor),idxArea);

        bcopy=bdil;
        for(m=idxEliminate)
            bcopy(stats(m).PixelIdxList)=0;
        end

        % second iteration
        bcopyDil=imerode(imerode(bcopy,se0),se1);
        stats=regionprops(bcopyDil,'MajorAxisLength','MinorAxisLength','FilledArea','PixelIdxList','PixelList');
         MajorAxisLength =  [stats.MajorAxisLength];
        MinorAxisLength =  [stats.MinorAxisLength];
        FilledArea  = [stats.FilledArea];

          maxMajorAxisLength = max(MajorAxisLength);
           idxEliminate  = find(MajorAxisLength<maxMajorAxisLength);

            bcopy=bcopyDil;
        for(m=idxEliminate)
            bcopy(stats(m).PixelIdxList)=0;
        end

        % more dilate
        bdil=imdilate(imdilate(bcopy,se0),se1);
       b=bdil;

    %%template
    n=150;
    zleft=zeros(n);
    zleft(1:n-2,2:3)=1;
    zleft(n-3:n-2,2:end)=1;

    zright=zeros(n);
    zright(1:n-2,n-3:n-2)=1;
    zright(n-3:n-2,1:end-2)=1;

    %%match left

    cc = xcorr2(double(b),double(zleft));
    figure,imagesc(cc);title('left correlation');
     [max_cc, imax] = max(abs(cc(:)));
     [ypeak, xpeak] = ind2sub(size(cc),imax(1));
     corr_offset = [ (ypeak-size(zleft,1)) (xpeak-size(zleft,2)) ];
     hold on,plot(xpeak,ypeak,'ys')
     yleft = corr_offset(1)+n-2;
     xleft = corr_offset(2)+1;

     figure(100),imshow(borg),hold on,plot(xleft,yleft,'rs');title('corr found edge')

     %%match rigth

    cc = xcorr2(double(b),double(zright));
    figure,imagesc(cc);title('right correlation');
     [max_cc, imax] = max(abs(cc(:)));
     [ypeak, xpeak] = ind2sub(size(cc),imax(1));
     corr_offset = [ (ypeak-size(zright,1)) (xpeak-size(zright,2)) ];
     hold on,plot(xpeak,ypeak,'ys')

    %%her i not recive the good index
     yright = corr_offset(1)+n-2;    
     xright = corr_offset(2)+1;

    %  figure(100),imshow(b),hold on,plot(xleft,yleft,'rs');title('corr found edge')*