def roiFromEdges(edges):
kernel = cv2.getStructuringElement(cv2.MORPH_ELLIPSE, (7, 7))
small_kernel = cv2.getStructuringElement(cv2.MORPH_ELLIPSE, (3, 3))
# close gaps in edges to create continous regions
roi = cv2.dilate(edges, small_kernel, iterations=14)
return cv2.erode(roi, kernel, iterations=4)
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