Re: Sub-Pixel Edge detection plugin?

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:IMAGEJ@xxxxxxxxxxxx] On Behalf Of
calope14
Sent: Tuesday, March 28, 2006 10:20 AM
To: IMAGEJ@xxxxxxxxxxxx
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
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