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How remove 'bubble' contours from image

I am trying to remove a kind of "bubble" contours from my images. I can draw them scrolling the list of PointOfMat retrieved with Imgproc.findContours, but I am not able to detect them between others. I tried working on number of vertices, but no way. A sample is here or here (high definition). I prefer Java, but any help in any coding language would be much appreciated.