Posted by
Justin McGrath on
May 13, 2007; 3:52am
URL: http://imagej.273.s1.nabble.com/Finding-the-location-of-lines-in-an-image-tp3699345.html
I have a lot of pictures similar to this one
http://www.life.uiuc.edu/ainsworth/example/2007-05-10__7002.jpgI have macros and plugins to detect the leaf and measure area if you
draw a selection box around it, but I would like to have a solution
that can take an image and find the leaf without user input. Last
year I collected thousands and they were done with the macros and
everyone who helped me is sick of it.
I have a plugin that calculates a greeness index and I can threshold
that to segment out most of the unwanted stuff. From there I've tried
things to get rid of noise and then used find maxima to find my leaf.
However, all the noise on the sides of the images causes problems,
especially since it's mostly green stuff.
I'd like to find the edges of the white square and crop the image
(they sometimes vary a lot from image to image - another problem).
Edge detection finds the edges well, but I don't know how to get any
information about the lines. A linear Hough transformation seems like
it would work, especially since I could just look for lines at 90
degrees, but I can't find a plugin that implements it. However, I see
posts about one for ImageJ.
Anyone know where I can get a plugin for the Hough transform or do you
know a better solution to crop the unwanted part? Also, do you know
of some good ways to segment out the leaf of interest?
Thanks for the help.
Justin