Construction of structural edge map on chest radiograph using hough transformation and line connection
Tetsuo Sugahara, Yoshio Yanagihara, Naozo Sugimoto · Systems and Computers in Japan · 1995
Abstract For computer diagnosis of a chest radiograph, we propose a method to make a structural edge map consisting of subclaviculars, heart, diagram, and ribs that have been extracted from a chest radiograph. On processing, the intensity of the edges of an input image was calculated by a derivative filter. Next, the possibility of lines and/or arcs was calculated by Hough transformation. This transformation was applied to 13 small areas for each of the organs in the image. A reconnection of lines and arcs representing the edges of the organs was performed, and a structural edge map was then constructed. As a result detection of subclaviculars, heart, diaphragms, and inferior edge lines of ribs was very good (ge; 79 percent). However, detection on superior edge lines was poor (= 55 percent).