Automatic, Anatomically Selective, Artifact-Free Enhancement Of Digital Chest Radiographs
M. Ibrahim Sezan, Ahmet Murat Tekalp, Ralph Schaetzing · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1988
We propose a technique for automatic, anatomically selective, artifact-free enhancement of digital chest radiographs. Anatomically selective enhancement is motivated by the different enhancement requirements of the lung field and the mediastinum. A recent peak detection algorithm is applied to the image histogram to automatically determine a gray-level threshold between the lung and mediastinum fields. The gray-level threshold facilitates anatomically selective gray-scale modification and unsharp masking. Further, in an attempt to suppress possible white-band artifacts due to unsharp mask-ing at sharp edges, local-contrast adaptivity is incorporated into anatomically selective unsharp masking by designing an anatomy-sensitive emphasis parameter that varied asymmetrically with positive and negative values of the local image contrast.