Thinning by morphological operators
Since the backgrounds of our sample images are white (256 in gray-scale),
we used dilation operator, which dilates the background and thins the image.
, where b is the
structuring element.
To prevent values greater than 255, which appear as the result of dilation
operator above, we made a kind of normalization by multiplying each gray
value by the coefficient (255/maximum gray value) if maximum gray value
is greater than 255. Here is the structuring element :
Pivot element is the one in the center (darkest one).
Samples
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