Hi
I am using Image J to help analyze static posture. I took a picture of 30 people standing neutral with some markers on bony landmarks on their body. Half of them were put through a 4 week treatment period and half of them weren't. They all came back and got photographed again, in the same neutral stance. I know Image J can be used to compare the 2 images to measure the changes, but I haven't been able to figure out how. I tried writing down the xy co-ordinates, but I'm sure there is a better way. Also, the angle of the camera was changed for a few of the pictures, but the distance always remained the same. Can anyone help guide me in this process? Thank you! Thanks so much! Holly [hidden email] -- Holly Treddenick Blue Bird Osteopathy Femmes du Feu 26 Sarnia Ave 647-234-2583 |
> Also, the angle of the camera was changed for a few of the pictures, but
> the > distance always remained the same. Can anyone help guide me in this > process? You need to scale the images relative to the common landmarks. Stephan Saalfeld will demonstrate a plugin on how to do this automatically at the ImageJ conference this November 6-7 in Luxemburg. It has to do with feature extraction: http://pacific.mpi-cbg.de/wiki/index.php/Feature_Extraction ... and in extracting the transformation matrix from the feature correspondences, and then registering both images: http://pacific.mpi-cbg.de/wiki/index.php/Plugins_Menu#Registration Hope that helped a bit. Albert -- Albert Cardona http://www.mcdb.ucla.edu/Research/Hartenstein/acardona/ |
In reply to this post by Holly Treddenick
Possibly your aproach is better handeled by a landmark-based analysis.
See for that under http://www.morphometrics.org/ Regards Karsten Am 16.10.2008 um 22:35 schrieb Holly Treddenick: > Hi > I am using Image J to help analyze static posture. I took a picture > of 30 > people standing neutral with some markers on bony landmarks on their > body. > Half of them were put through a 4 week treatment period and half of > them > weren't. They all came back and got photographed again, in the same > neutral > stance. I know Image J can be used to compare the 2 images to > measure the > changes, but I haven't been able to figure out how. I tried writing > down the > xy co-ordinates, but I'm sure there is a better way. > > Also, the angle of the camera was changed for a few of the pictures, > but the > distance always remained the same. Can anyone help guide me in this > process? > Thank you! > > Thanks so much! > Holly > [hidden email] > > -- > Holly Treddenick > Blue Bird Osteopathy > Femmes du Feu > 26 Sarnia Ave > 647-234-2583 |
<quote author="Karsten Rodenacker-3">
"Possibly your aproach is better handeled by a landmark-based analysis. See for that under http://www.morphometrics.org/ Regards Karsten" Apropos morphometrics. Recently a good book (im my opinion) was published about morphometrics with R which can be used in combination with ImageJ (the book examples not using Imagej!). http://www.springer.com/statistics/stats+life+sci/book/978-0-387-77789-4 |
In reply to this post by Holly Treddenick
I've been doing this for years in my Rolfing practice and class, first
with NIH Image and lately with ImageJ. I've developed a set of macros that work with the Mac and a firewire video camera or with Linux and a digital camera (downloading the pictures. I'd be happy to share the macros I have (they are a little rough but available on my website at http://jefflinn.yogabodywork.net/imaging.html ). As far as adjusting for different camera positions in the pictures there are better minds on this board for that. I learned early on that it was much easier to have the camera in a fixed position rather than post process. I think there was an article written in the Journal of Bodywork and Movement Therapies a while back (not sure when but you may be able to search them online) about doing this with ImageJ (technical no macros or plugins as I remember). Good Luck, Jeff Linn Guild for Structural Integration [hidden email] On Thu, 2008-10-16 at 16:35 -0400, Holly Treddenick wrote: > Hi > I am using Image J to help analyze static posture. I took a picture of 30 > people standing neutral with some markers on bony landmarks on their body. > Half of them were put through a 4 week treatment period and half of them > weren't. They all came back and got photographed again, in the same neutral > stance. I know Image J can be used to compare the 2 images to measure the > changes, but I haven't been able to figure out how. I tried writing down the > xy co-ordinates, but I'm sure there is a better way. > > Also, the angle of the camera was changed for a few of the pictures, but the > distance always remained the same. Can anyone help guide me in this process? > Thank you! > > Thanks so much! > Holly > [hidden email] > |
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