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cv.findContours is connecting unconnected regions

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contours, hierarchy = cv.findContours(blobs, cv.RETR_EXTERNAL, cv.CHAIN_APPROX_SIMPLE)
cv.drawContours(blobs, contours, -1, (0,255,0), 2)


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Why unconnected regions become part of the same contour, as in the example above? Is this the expected behaviour? What can I do to obtain separate contours for these regions?