Re: [MORPHMET] landmarking a translucent matching symmetry object (like flywings)

[andrea cardini]

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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Dr. Andrea Cardini
Researcher, Dipartimento di Scienze Chimiche e Geologiche, Università di Modena 
e Reggio Emilia, Via Campi, 103 - 41125 Modena - Italy
tel. 0039 059 2058472

Adjunct Associate Professor, School of Anatomy, Physiology and Human Biology, 
The University of Western Australia, 35 Stirling Highway, Crawley WA 6009, 
Australia

E-mail address: alcard...@gmail.com, andrea.card...@unimore.it
WEBPAGE: https://sites.google.com/site/alcardini/home/main


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[MORPHMET] landmarking a translucent matching symmetry object (like flywings)

[Helmi Hadi]

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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MORPHMET may be accessed via its webpage at http://www.morphometrics.org
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