| 摘要 |
<p>A method and system for the automated segmentation of the lung regions in lateral chest radiographs (10) based on gray-level threshold analysis. Approximate outer bounds on the extent of the lung fields in the image are identified to restrict the region further analyzed (16). An iterative global gray-level thresholding method (20) is applied based on the features of a global gray-level histogram. Features of the regions in a binary image constructed at each iteration are identified and subjected to a modified analysis to exclude regions external to the lung field. Individual regions-of-interest (ROIs) are placed along the initial contour. The single gray-level threshold to be applied to the pixels within the individual ROIs is determined (1009). A final contour is constructed to enclose 'on' regions (26). Smoothing is performed using a rolling ball method and fitted polynomial curves are spliced into the final contour (1011).</p> |
