Here, the algorithm
gave two ellipses as shown in Fig. 3a. The larger ellipse represents
the corpus and the smaller one the head. The corpus area of
the pig surrounded by the corpus ellipse, namely ‘‘A’’ in Fig. 3b was
calculated once a minute and used for BW estimation. In order to
limit processing to standard standing positions of pigs in weight
estimation, 2700 area pixels (for camera height of 2.2 m) were
regarded as a minimum of ‘‘A’’.