-------- Original Message --------
Subject: Re: image taking for geometric morphometrics
Date: Wed, 7 Sep 2011 10:57:21 -0400
From: Dennis E. Slice <[email protected]>
To: [email protected]
Just image a sheet of good graph paper. Deviations from known cell
dimensions scaled at the center of the image will document the magnitude
and distribution of distortion. There are ways, I believe, even to use
such information to back transform the image to remove that distortion -
the GM community would probably start with a thin-plate spline
unwarping. -ds
On 9/7/11 10:52 AM, morphmet wrote:
-------- Original Message --------
Subject: Re: image taking for geometric morphometrics
Date: Wed, 7 Sep 2011 01:49:36 -0400
From: Darren Parsons <[email protected]>
To: morphmet <[email protected]>
Thank you very much for all the help, it gives me a lot to go on.
I have one specific query for now. I am concerned that in taking an
image of a fish of 40 cm, that distortion may take place (i.e. the part
of the fish directly under the camera will be closer to the lense than
the parts of the fish near the edge of the field of view). Is this
likely to be a problem at the scale of a 40 cm fish or not really worth
worrying about?
Thanks again,
Cheers,
Darren
Darren Parsons
National Institute of Water and Atmospheric Research (NIWA)
41 Market Place, Private Bag 99940, Auckland, New Zealand
ph: +64-9-375 4531
fax: +64-9-375 2051
cell: 021 170 1724
email: [email protected] <mailto:[email protected]>
>>> morphmet <[email protected]> 7/09/2011 12:35
a.m. >>>
-------- Original Message --------
Subject: image taking for geometric morphometrics
Date: Mon, 5 Sep 2011 19:18:07 -0400
From: Darren Parsons <[email protected]>
To: <[email protected]>
Hi there,
I am just starting out with geometric morphometrics, so was hoping
someone could point me towards any documents that could get me started.
My specific query is around the image taking process. This is because I
may not be able to analyse the images for some time (images will be of
fish ~ 40 cm in length). So, for now, I would like to ensure that I take
images that will allow me to do 2D analysis later on. Is there a
document/book/previous string of postings that outlines the best image
taking process/equipment in simple terms? I have "Zelditch, Geometric
morphometrics for biologists : a primer" on order from my library?
Any help would be greatly appreciated.
Thanks,
Darren
(please send replies to [email protected] <mailto:[email protected]>)
Darren Parsons
National Institute of Water and Atmospheric Research (NIWA)
41 Market Place, Private Bag 99940, Auckland, New Zealand
ph: +64-9-375 4531
fax: +64-9-375 2051
cell: 021 170 1724
email: [email protected] <mailto:[email protected]>
Please consider the environment before printing this email.
NIWA is the trading name of the National Institute of Water &
Atmospheric Research Ltd.
Please consider the environment before printing this email.
NIWA is the trading name of the National Institute of Water &
Atmospheric Research Ltd.
--
Dennis E. Slice
Associate Professor
Dept. of Scientific Computing
Florida State University
Dirac Science Library
Tallahassee, FL 32306-4120
-
Guest Professor
Department of Anthropology
University of Vienna
-
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