I would like to use a reference object for scale (like a wallet card) to then take measurements of multiple parts of wrist and hand, all implemented into a webapp.
Does anyone know of any resources such as tutorials, papers or other similar projects?
Also, what is the best approach for this? Is it to take the image(s), send to the server, process using python and then spit back the information? Or is there a way to do it all in-browser? Please advise.
Thanks in advance 
tl;dr : Are there any tutorials or papers on taking measurements from webcam in-browser?