enblend algorithm

Hi,
I was trying to study and understand how Enblend algorithm works.
I'm looking at the example in http://enblend.sourceforge.net/details.htm,
where it says (just before the example) "The algorithm finds a line
which is as far away as possible from the edges of the area where two
images intersect".
Looking at the picture I wonder why the line starts at the upper left
corner of the intersection, shouldn't it be in the middle ??? For sure
I'm not understanding the purpose of Enblend. Wouldn't be that
blending line simply the line in the middle of the intersection ? If
someone could enlighten me...Thanks.

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