How about applying a morphological closing operation until an ellipse fit 
converges in quality?

With that fish though, maybe need a few “erosion” operations to scrape of those 
fins. ;)

The disadvantage of morphological erosion alone is that the size of the object 
will be reduced, while the combo of erosion and dilution (i.e. “closing”) keeps 
the integrated object size nearly the same.

Michael


> On Apr 10, 2017, at 16:48, Surya Kasturi <sur...@udel.edu> wrote:
> 
> Hey everyone,
> 
> My name is Surya — working on a project on image classification.
> 
> I’m interested in identifying non-rigid shapes (close to an ellipse) in an 
> image. Sample image below.
> 
> Could anyone please point me to some references for that? 
> 
> 
> <output1.jpg>
> 
> Thanks
> Surya
> 
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