Figure 6From: Lung segmentation on standard and mobile chest radiographs using oriented Gaussian derivatives filter Filling the lung outline based on global thresholding and convex hull. (a) Input image L outline (b) smoothed I HFEF , (c) thresholded I HFEF (I th ), (d) convex hull of L outline (L CH ), (e) ROI of I th within L CH (f) I th-roi , (g) I th-roi  + L outline , and (h) final estimated lung mask, L mask .Back to article page