[R] Calculating diameters of cirkels in a picture.

[Paul Smith]

On 8/23/07, Bart Joosen <Bartjoosen at hotmail.com> wrote:
> Maybe this is more a programming questions than a specific R-project question, but maybe there is someone who can point me in the right direction.
>
> I have a picture of cirkels which I took with a digital camera.
> Now I want to use the diameter of the cirkels on the picture for analysis in R.
> I can use pixmap to import the picture, but how do I find the outside cirkels and calculate the diameter?
> I pointed out that I can use the edci package, but then I need to preprocess the data to reduce the points, otherwise it takes a long time, and my computer crashes.
>
> If you want to see such a picture, I cropped a larger one, and highlighted the cirkel which is of interest.
> In a real world, this is a plate with 36 cirkels, which all should be measured.
> www.users.skynet.be/fa244930/fotos/outlined.jpg

You mean the diameter measured in number of pixels?

Paul