Issue Regarding Edge/ Feature Detection in an Image

Hello,

I am trying to write a MATLAB code which automatically detects the edges/ features in the image. For example, my image is of size X * Y and there is an oval shaped structure at (ath Row,bth Column). I tried edge keyword with various methods, but since my oval shape is dis continuous in the image, proper edge is not formed. Hence, I couldn't detect a proper edge/ boundary for the oval. (Image is attached.)

My issues are:

1. First I need to detect the oval through my code and
2. Extract the row numbers(min and max) in between which this oval structure is present in the image.

Any help is much appreciated.

Thanks,

Hari..