Hi Helmi,
other may have different views, but I would work on, say, the left wing
and the right one mirrored. Although those landmarks are likely to be
very precise, your 'eyes' might see left and right slightly differently,
if one is not mirrored, and you may introduce a small bias. This is of
course testable but I would not waste the time and simply mirror the
images using a batch command (available for instance in IRFANVIEW, which
is free).
Good luck.
Cheers
Andrea
PS
For the GPA, the mirroring won't matter if the software (MorphoJ and
Morphologika, for instance) can do it, but I would still worry about the
possible bias.
On 28/07/16 09:59, Helmi Hadi wrote:
Dear morphometricians,
I have an odd question. For a translucent matching symmetry object
like fly wings, the venation can be seen on both sides of the object.
Should I flip one side of the wing (left or right side) and landmark
all wings in one configuration or should I retain a sort of mirror
image when landmarking the object. Does it matter or will it affect
analysis later on say if I am classifying it based on side (if I add a
left/right side classifier)?
Thank you.
Helmi Hadi,
School of Health Sciences,
Universiti Sains Malaysia,
Kelantan, Malaysia
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