Fig. 2From: Robust segmentation of lung in chest x-ray: applications in analysis of acute respiratory distress syndromeSegmentation with the stacked active contour model. (a) An example source image is shown for reference. (b) When the final segmentation mask is processed with a standard active contour model, areas of incorrect segmentation can be systematically observed – most commonly, at the right lung’s costophrenic recess and regions adjacent to the diaphragm. (c) Quadrant-based processing with a stacked active contour model shows better deformation and contouring to peripheral boundaries. (d) Final output for segmentation of the right lung after combining the upper and lower quadrants and applying a smoothing filterBack to article page