Center of a circle

[Al Huang]

Hi,

 

Is there a plugin to find the center from a partial circle?

 

Any help would be appreciated,

 

Al Huang

CeeMax Ophthalmic

 

[David Webster]

Look up one of the *circular* Hough Transform plugins on "
imageJ/plugins/Analysis/Hough Circles".

On Fri, Feb 18, 2011 at 3:27 PM, Al Huang <[hidden email]> wrote:

> Hi,
>
>
>
> Is there a plugin to find the center from a partial circle?
>
>
>
> Any help would be appreciated,
>
>
>
> Al Huang
>
> CeeMax Ophthalmic
>
>
>

[Michael Doube]

Hi Al

Wayne implemented circle-fitting in ImageJ:

"1.44m, 1 January 2011
Thanks to Ved Sharma and Michael Doube, added the Edit>Selection>Fit Circle command, which fits a circle to line and multi-point selections. With area selections, it creates a circle with the same area and centroid."
http://rsbweb.nih.gov/ij/notes.html

So you have to draw a roi on your partial circle, then run this command.

Michael


>Is there a plugin to find the center from a partial circle?

[chenyanpei]

analyze ->analyze particle->measure

2011/2/19 Doube, Michael <[hidden email]>

> Hi Al
>
> Wayne implemented circle-fitting in ImageJ:
>
> "1.44m, 1 January 2011
> Thanks to Ved Sharma and Michael Doube, added the Edit>Selection>Fit Circle
> command, which fits a circle to line and multi-point selections. With area
> selections, it creates a circle with the same area and centroid."
> http://rsbweb.nih.gov/ij/notes.html
>
> So you have to draw a roi on your partial circle, then run this command.
>
> Michael
>
>
> >Is there a plugin to find the center from a partial circle?
>

--
Chen Yanpei, phD
MssMat
Ecole Centrale Paris
Grande voie des vignes
92295 Châtenay Malabry
Paris, France