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In this study, an automated system for analyzing the landmarks
in upon the cephalograms is designed and implemented for use
in. and P.A cephalograms from National Cheng Kung University
hospital digitized by a PC-based image acquisition and analysis
system. reference points and the width of face, the image is
then divided rectangular subimages containing useful landmarks.
In thisst derivative of a Gaussian function is used as the
wavelet function edges from the noisily enhanced images. Then,
based upon the anatomy, the concept of least distance, Hough
transform, and the auxiliary line from LAT. landmarks the
position of landmarks are ]The average error for landmarks
location of PA. is less than 4mm system）. Finally, all the
landmarks of P.A and LAT. are combined reconstructed in 3D
using the modified orthogonal radiography
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