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2016-01-18 04:27:29 -0600 commented question Why is boundary detected as a contour?

But the thresholded image doesn't show any black border. Edited the question to show the thresholded image.

2016-01-18 04:26:41 -0600 received badge  Editor (source)
2016-01-18 03:16:18 -0600 commented question Why is boundary detected as a contour?

opencv 3.0.0 is used with python 2.7

2016-01-18 03:16:17 -0600 asked a question Why is boundary detected as a contour?

image description after threshold

If the function is looking for white obstacles, then yes it makes sense that boundary is considered an obstacle. But then, why would the black cap be considered an obstacle and a contour be formed on it?