Finally I understand that contour(I,[lvl lvl]) separates zones where point heights are strictly lower than lvl from zones where point heights are greater or equal than lvl.
Contours of uniform 2D objects with contourc
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Hi,
Using the function contour on gray-level images, I notice a strange feature about contours of a specific level with uniform connex components.
I want to test it for level 127 on a synthetic image, so I make athis illustrative test sample:
I = [255*ones(9,3),127*ones(9,3),zeros(9,3)];
Quoting the documentation: "To draw a single contour of level i, use contour(Z,[i i])."
So I call
contour(I,[127 127]);
The display shows only the right boundary, not the left one. When I type
contour(I,[127 128]);
then I have the two boundaries (with different colors).
I don't understand why is that so; I can't figure out with reading the doc. Does anybody know why is that so?
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