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findCompatibleExitPixs.m
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findCompatibleExitPixs.m
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function exitPixs = findCompatibleExitPixs(imSize, entryPix, exitEdge)
colormat = zeros(imSize(1),imSize(2));
for i = 1:imSize(1)
for j = 1:imSize(2)
s = mod(i + j,2);
colormat(i,j) = s;
end
end
exitPixs = [];
% even cases
% if imSize(1) == imSize(2) &&
if mod(imSize(1) * imSize(2),2) == 0 % 2*n * 2*n case
if entryPix(1)>size(colormat,1)
entryPix(1) = entryPix(1) - size(colormat,1);
end
if entryPix(2)>size(colormat,2)
entryPix(2) = entryPix(2) - size(colormat,2);
end
entryColor = colormat(entryPix(1),entryPix(2));
cnt = 1;
switch(exitEdge)
case 1 % bottom
exitPixs = zeros(imSize(2)/2, 2);% one entry point can have two
exitPixs(:,1) = imSize(1);
for i = 1:size(colormat,2)
if colormat(exitPixs(cnt,1),i)~= entryColor
exitPixs(cnt,2) = i;
cnt = cnt + 1;
if cnt >= size(exitPixs,1)+1
return;
end
end
end
case 2 % right
exitPixs = zeros(imSize(1)/2, 2);% one entry point can have two
exitPixs(:,2) = imSize(2);
for i = 1:size(colormat,1)
if colormat(i,exitPixs(cnt,2))~= entryColor
exitPixs(cnt,1) = i;
cnt = cnt + 1;
if cnt >= size(exitPixs,1)+1
return;
end
end
end
case 3 % top
exitPixs = zeros(imSize(2)/2, 2);% one entry point can have two
exitPixs(:,1) = 1;
for i = 1:size(colormat,2)
if colormat(exitPixs(cnt,1),i)~= entryColor
exitPixs(cnt,2) = i;
cnt = cnt + 1;
if cnt >= size(exitPixs,1)+1
return;
end
end
end
case 4 % left
exitPixs = zeros(imSize(1)/2, 2);% one entry point can have two
exitPixs(:,2) = 1;
for i = 1:size(colormat,1)
if colormat(i,exitPixs(cnt,2))~= entryColor
exitPixs(cnt,1) = i;
cnt = cnt + 1;
if cnt >= size(exitPixs,1)+1
return;
end
end
end
end
else
return;
end
end