Re: Largest enclosed convex shape to measure eggs with appendages

Posted by nicola giacobbe on Aug 19, 2013; 4:09pm
URL: http://imagej.273.s1.nabble.com/Largest-enclosed-convex-shape-to-measure-eggs-with-appendages-tp5004483p5004493.html


I have used the shape smoothing plugin  
(https://code.google.com/p/ij-shape-smoothing/) and it works well.
The effect of the plugin could be seen in the attached image.

On Mon, 19 Aug 2013 12:20:23 +0200, Tom Kazimiers <[hidden email]>  
wrote:

> Dear all,
>
> On images like the one attached, I want to measure the maximum length of
> each eggshell. Those eggshells are ellipse like structures with usually
> two smaller appendages. Those, however, shouldn't be part of the
> measurement, but only the eggshell itself.
>
> Unfortunately, it isn't enough to threshold the image and find the
> longest straight line in the egg. The problem is: if the appendages are
> inconveniently located, the longest straight line will go through them
> as well---which wouldn't be what I want to measure.
>
> Therefore, I thought, it would be best to threshold first and then find
> the largest enclosed convex shape and then do the measuring on this
> shape. Now, I guess I could implement something like
>
>     A Polynomial Solution For Potato-Peeling And Other Polygon Inclusion
>     And Enclosure Problems (J. S. Chang and C. K. Yap 1984),
>
> but I was wondering if there is something similar in ImageJ/Fiji already
> that I miss or if you have another suggestion on how to do those
> measurements. Any ideas?
>
> I tried to use the watershed plugin and it cut the appendages in most
> cases, but not in all. Also the cuts where sometimes rather far away
> from the egg itself and so the longest straight line could still go
> through the cut appendage.
>
> Thanks in advance,
> Tom
>
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