“…In the end, two lung regions were extracted from the labeled image, the largest and next largest connected regions, and the rest of the segmented regions set as the background [23], [24]. The threshold segmentation of the lungs is the work of [18], [19], [21]- [23], [25]- [27], [28]- [36]. Otsu threshold [28], [37], segmentation on the basis of the iterative threshold [9], [38], [39], adaptive threshold [26], [40], The literature has an adaptive 3-D fuzzy threshold [41].…”