IPSC2017_M

img00=im2double(imread('m.png'));
img00 =1-img00;

img0=padarray(img00(131:3664,98:3631),[6 6],0,'post');
img1=img0.*0;

tot=[];

for rr=-4 %-8:3
    row=[];
    for cc=-4%-11:0
        xx=cc*size(img0,1)+rr;
        if (xx<0), xx=xx+numel(img0); end;
        img1=reshape(img0([1+xx:end 1:xx]),size(img0));
        %img0(1:end-1,1:end-1);

        img=imresize(img1,1/6,'bilinear');

        sz=354/6
        piece=@(r,c) img(sz*r+(1:sz),sz*c+(1:sz));

        %
        crops=cell(10,10,7);

        for r=0:9
            for c=0:9
                [r c]
                crops{r+1,c+1,1}=piece(r,c);
                for rot=(1:6)
                    deg=rot*(180/7);
                    crops{r+1,c+1,rot+1}=imrotate(crops{r+1,c+1,1},deg,'bilinear','crop');
                end
            end
        end

        row=[row cat(3,crops{1,1,1},crops{1,1,3},crops{1,1,5})];
        %imshow(imresize(cat(3,crops{1,1,1},crops{1,1,3},crops{1,1,5}),4,'nearest'));

    end
    tot=[tot;row];
end

% imshow(tot);
imshow([tot, -.2-tot+cat(3,abs(tot(:,:,2)-tot(:,:,3)),abs(tot(:,:,3)-tot(:,:,1)),abs(tot(:,:,1)-tot(:,:,2)))])

%%
rows='0123456789';
cols='ABCDEFGHIJ';

% minD=1000000000; % 1 2
minD=0; %3
for r=0:9
    for c=0:9
%         [r c]
        for r1=0:9
            for c1=0:9
                for rot=(1:7)
if (r1==r && c1==c) continue; end

                    X=crops{r+1,c+1,1}; %match 1, 3
%                     X=fliplr(crops{r+1,c+1,1}); %match 2
                    D=sum(max(0,reshape(-.5+abs(X-crops{r1+1,c1+1,rot}),[],1))>0);
%                     if (D<minD)  % < for 1,2 and > for 3
                    if (D>minD)  % < for 1,2 and > for 3
                        [r+1 c+1 r1+1 c1+1 rot D]
                        minr=r+1;minc=c+1;minr1=r1+1;minc1=c1+1;
                        minD=D;
                    end
                end
            end
        end
    end
end

[cols(minc) rows(minr) ' ' cols(minc1) rows(minr1)]

imshow(img00)