Sub-Pixel Edge detection plugin?

[calope14]

Hello to all,
I am doing an intensive project over the next couple weeks that is concerned with computer vision dimensional guaging. I was planning to use ImageJ for the image editing software as there are possibilities of needing to write a plugin to gather and store data about a picture.

But what I really need is a plugin that can find edges to a sub-pixel standard. All I will be doing is finding the diameter of a circular object to a sub-pixel standard. Does any one knnow of a plugin that does this. I would gladly make one but this is an area that I know little about and dont have time to do a lot of background learning. So if anyone could even let me know the steps in the procedure of sub-pixel edge detection and the names of some algorithms or processes used for them it would be a tremendous help, I have searched the internet thouroughly and there are no real clear insrtuctions for what I'm doing that doesnt cost money. I am sorry to bother you all but time is really an issue so if anyone could give me a shove in the right direction I would be most grateful.
Thank you for you time, and I wish you all luck on your current work projects.

Calvin Slope

[Carl Sebeny]

A simple but effective method to obtain sub-pixel resolution is to
simply "Resize" the image while checking the dialog boxes to "Constrain
Aspect Ratio" and "Interpolate" and increasing the size by a substantial
amount (X8 for example). Then measure using the higher resolution image
after calibrating.

Carl Sebeny,
Applied Vision Company  


-----Original Message-----
From: ImageJ Interest Group [mailto:[hidden email]] On Behalf Of
calope14
Sent: Tuesday, March 28, 2006 10:20 AM
To: [hidden email]
Subject: Sub-Pixel Edge detection plugin?

Hello to all,
I am doing an intensive project over the next couple weeks that is
concerned
with computer vision dimensional guaging. I was planning to use ImageJ
for
the image editing software as there are possibilities of needing to
write a
plugin to gather and store data about a picture.

But what I really need is a plugin that can find edges to a sub-pixel
standard. All I will be doing is finding the diameter of a circular
object
to a sub-pixel standard. Does any one knnow of a plugin that does this.
I
would gladly make one but this is an area that I know little about and
dont
have time to do a lot of background learning. So if anyone could even
let me
know the steps in the procedure of sub-pixel edge detection and the
names of
some algorithms or processes used for them it would be a tremendous
help, I
have searched the internet thouroughly and there are no real clear
insrtuctions for what I'm doing that doesnt cost money. I am sorry to
bother
you all but time is really an issue so if anyone could give me a shove
in
the right direction I would be most grateful.
Thank you for you time, and I wish you all luck on your current work
projects.

Calvin Slope
--
View this message in context:
http://www.nabble.com/Sub-Pixel-Edge-detection-plugin--t1356294.html#a36
31519
Sent from the ImageJ forum at Nabble.com.

[Jeff Linn]

Is there any way to write a 'run()' macro function to access the File>Import>Video Quicktime capture Plug-In?

Thanks,

Jeff Linn

[Joachim Wesner]

Hi Calvin,

did you really search thoroughly? Look there, they even seem to have a
ImageJ plugin, but it´s not (yet) public!? Maybe you can contact them?

http://bigwww.epfl.ch/demo/subpixeledge/index.html

Joachim



                                                                                                                                       
                      calope14                                                                                                        
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                      28.03.2006 17:20                                                                                                
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Hello to all,
I am doing an intensive project over the next couple weeks that is
concerned
with computer vision dimensional guaging. I was planning to use ImageJ for
the image editing software as there are possibilities of needing to write a
plugin to gather and store data about a picture.

But what I really need is a plugin that can find edges to a sub-pixel
standard. All I will be doing is finding the diameter of a circular object
to a sub-pixel standard. Does any one knnow of a plugin that does this. I
would gladly make one but this is an area that I know little about and dont
have time to do a lot of background learning. So if anyone could even let
me
know the steps in the procedure of sub-pixel edge detection and the names
of
some algorithms or processes used for them it would be a tremendous help, I
have searched the internet thouroughly and there are no real clear
insrtuctions for what I'm doing that doesnt cost money. I am sorry to
bother
you all but time is really an issue so if anyone could give me a shove in
the right direction I would be most grateful.
Thank you for you time, and I wish you all luck on your current work
projects.

Calvin Slope
--
View this message in context:
http://www.nabble.com/Sub-Pixel-Edge-detection-plugin--t1356294.html#a3631519

Sent from the ImageJ forum at Nabble.com.



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[calope14]

Yes, thank you, I had found this website and I have searched rather extensively. This website, while it does work with subpixel accuracy, has no way of measuring distances from one edge to another, and I could not find a way to get at the code to add something along those lines. It does explain what is going on in the process but as I say I really know very little about this area and couldnt make sence of all the information.

But thank you very much for letting me know, I will definatly send an email to them asking about it. Thank you for your time on my behalf,
Calvin

[calope14]

Hello Carl,
Thank you very much! This does sound like a very feasable solution and I will look into this as soon as possible. This has helped a lot and made me feel a bit better about this knowing I have an inital possible solution. Thank you for your time on this matter and your invaluable help.
Calvin