Re: measure length of many parallel lines?

Posted by sombreroduck on
URL: http://imagej.273.s1.nabble.com/measure-length-of-many-parallel-lines-tp5002827p5002848.html

Thanks Michael and Herbie,
The GHT wasn't the one I'd been working with, it was the one from Burger&Burge I mentioned in the post above. I foudn your replies this a.m. and have been trying the GHT for a bit now, and one the +side it runs, but on the - it gives a rather curious output for my test images. I've been using these three (not to scale)

called "reference_object.jpg", "Image1.jpg" and Image2.jpg" resp.

The plugin it either finds 0 objects, or anything between 17 and 194. It is probably my choice of parameters, you're right that it isn't intuitive, even with the PDF, but why does it search for the reference object in the image named "reference_object"?! and how can it find it 134 times?!

Two parameters I don't understand at all are the Size and Angle delta. Is this merely the difference between the max and min? (in which case why can't it figure that out for itsself?)

If I can figure this out, would the GHT be able to detect simple, straight lines too?
Cheers!
R

Michael Schmid-3 wrote

Hi R,

don't unpack anything, just save GHT_.jar into your plugins folder (that's also what is recommended ion the web page of the plugin)

For how to use it, see the PDF file.
Note that it's not self-explanatory and you have to follow the instructions. If you don't, you will get error messages that are not necessarily saying what is wrong.

Herbie-2 wrote

For IJ-PlugIns the first place to look in my opinion is

        <http://rsb.info.nih.gov/ij/plugins/index.html>

There you will find a link to

        <http://rsb.info.nih.gov/ij/plugins/ght/index.html>

where you can download the PlugIn and read:

"Installation: Drag and drop GHT_.jar onto the "ImageJ" window."

HTH