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so, if you have the contour already, you can get the boundingbox:
(x,y,w,h) = cv2.boundingRect(contours[0]) # assuming, there is only one contour
from there, it's a straight L2 norm:
pt = (x, y+h) # bottom-left of the obj
orig = (img.shape[1], img.shape[0]); ## bottom-right of the img
dist = math.sqrt( (pt[0]-orig[0])**2 + (pt[1]-orig[1])**2 )