Fit a rectangle/any specific structure in an image

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Hi,

I am trying to identify the bins in the image and separate them into left bins and right bin.

We can see there edges on the boundaries of the image and an edge in the middle (not all if them are visible though).

I am wondering if its possible to identify best probable fit for the above structure(rectangle like) in the image and get end points. so that i can separate the two bins.

Thanks