Re: how to measure length of lines

Posted by Gabriel Landini on
URL: http://imagej.273.s1.nabble.com/Open-images-tp3703382p3703385.html

On Friday 17 March 2006 01:14, Harry Parker wrote:
> Your 1st question has several answers, depending on how you define
> "length". Check the sites listed on ImageJ's Plugins page, especially
> Gabriel Landini's
> http://www.dentistry.bham.ac.uk/landinig/software/software.html .

I haven't got a plugin to consistently measure the length of lines/skeletons,
but I am working on a Lines8_Plus plugin which will do.

Briefly this is the same as the perimeter measurement of blobs in
Particles8_Plus (that is an 8-connected chain encoded profile --Freeman's
algorithm), but with a constrain. The skeleton is treated as a blob and
pixels already visited when going through the perimeter are not considered if
they have been already visited. (Note that in Particles8_Plus, a straight
line will return a perimeter approximately twice its length).

I think that the modification will work fine and I will be testing it soon.
If anybody wants to test before uploading for general consumption, please drop
me a not off-list.

Cheers,

Gabriel