bw_fragile_robust.rar_fragile_matlab图片隐藏_不确定_二值水印_水印添加

function blk=BlockEmbed2(md,blk) to=sum(blk(:)); if to==0 blk(1:mod(4-md,4))=1; elseif to==64 blk(1:md)=0; elseif to>4 if md>0 flag=0; for k=1:8 for l=1:7 if blk(k,l) ~= blk(k,l+1) % find a black pixel next to a white pixel blk(k,l)=0; % change both to black blk(k,l+1)=0; % change both to black flag=1; break; end end if flag break; end end if ~flag % if horizontal search failed, try vertical search for k=1:7 if blk(k,1) ~= blk(k+1,1) blk(k,1)=0; blk(k+1,1)=0; flag=1; break; end end end end if md>1 flag=0; for k=8:-1:1 for l=7:-1:1 if blk(k,l) ~= blk(k,l+1) % find a black pixel next to a white pixel blk(k,l)=0; % change both to black blk(k,l+1)=0; % change both to black flag=1; break; end end if flag break; end end if ~flag % if horizontal search failed, try vertical search for k=7:-1:1 if blk(k,1) ~= blk(k+1,1) blk(k,1)=0; blk(k+1,1)=0; flag=1; break; end end end end if md>2 flag=0; for l=8:-1:1 for k=7:-1:1 if blk(k,l) ~= blk(k+1,l) % find a black pixel next to a white pixel blk(k,l)=0; % change both to black blk(k+1,l)=0; % change both to black flag=1; break; end end if flag break; end end if ~flag % if horizontal search failed, try vertical search for l=1:7 if blk(5,l) ~= blk(5,l+1) blk(5,l)=0; blk(5,l+1)=0; flag=1; break; end end end end else md=mod(4-md,4); if md>0 flag=0; for k=1:8 for l=1:7 if blk(k,l) ~= blk(k,l+1) % find a black pixel next to a white pixel blk(k,l)=1; % change both to black blk(k,l+1)=1; % change both to black flag=1; break; end end if flag break; end end if ~flag % if horizontal search failed, try vertical search for k=1:7 if blk(k,1) ~= blk(k+1,1) blk(k,1)=1; blk(k+1,1)=1; flag=1; break; end end end end if md>1 flag=0; for k=8:-1:1 for l=7:-1:1 if blk(k,l) ~= blk(k,l+1) % find a black pixel next to a white pixel blk(k,l)=1; % change both to black blk(k,l+1)=1; % change both to black flag=1; break; end end if flag break; end end if ~flag % if horizontal search failed, try vertical search for k=7:-1:1 if blk(k,1) ~= blk(k+1,1) blk(k,1)=1; blk(k+1,1)=1; flag=1; break; end end end end if md>2 flag=0; for l=8:-1:1 for k=7:-1:1 if blk(k,l) ~= blk(k+1,l) % find a black pixel next to a white pixel blk(k,l)=1; % change both to black blk(k+1,l)=1; % change both to black flag=1; break; end end if flag break; end end if ~flag % if horizontal search failed, try vertical search for l=1:7 if blk(5,l) ~= blk(5,l+1) blk(5,l)=1; blk(5,l+1)=1; flag=1; break; end end end end end