Figure 3From: Lung segmentation on standard and mobile chest radiographs using oriented Gaussian derivatives filter The outputs of the contrast adjustment block. The two images are from different portable machines (a) to (c) and (d) to (f). (a) and (d) are the original images, (b) and (e) are after inverting the image and (c) and (f) are the results after correcting the contrast.Back to article page