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Example of identifying the thin tissue layer between lungs. Note that gray-values of figures (b)–(d) are shown inverted for better visibility. (a) Original CT slice. (b) Sheetness response based on the filter described in Sec. 4.A.1. (c) Connected component labeling output after hysteresis thresholding. (d) Binary classification result corresponding to the thin tissue layer between lungs.
