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Fig. 1 —Example of masking procedure. Bottom left image has pixels
from compressed image (top right) inside lungs, and pixels from
original image (top left) outside lungs. Bottom right image has
pixels from compressed image inside chest wall and mediastinum region and
pixels from original image outside region. To better present masking
procedure, we used compression level of 500:1 for these images, which was not
tested in our experiment.
