Re Find distance between donut

Re: Find distance between donut

Thanks for the response.  Really it isn't a circle i just just said
that so i could easily describe what I have.  Lets say it will be an
arbitrary shape mostly circular but not necessarily though and i want
the average distance (width as you mentioned) at several points ( say
4 points) around the object then average those width measurements to
get the "average width".

As i mentioned in the previous post I have an inner and outer line.

On Sep 30, 9:18=A0pm, ImageAnalyst  wrote:
> On Sep 30, 9:32=A0am, villuman...@gmail.com wrote:
>
> > If i have a binary mask lets say the shape of a donut and I want to
> > find the distance between the two edges of the donut at several
> > points, how exactly would I do this?
>
> ----------------------------------------------
> Find the coordinates of the edges. =A0Then use the Pythagorean theorem.
> What do you really want to know? =A0Do you want the average width of the
> donut? =A0Then you can get this better by finding the area of the circle
> with the outer perimeter, the area of the hole and subtracting them,
> then doing some elementrary math (assuming the areas to be perfect
> circles) to get the difference in the two average radii. =A0Using this
> method there's no need to loop over all the boundary points
> calculating distances.
> Regards,
> ImageAnalyst