Title :
A method of medical image enhancement using wavelet-coefficient mapping functions
Author :
Tsai, Du-Yih ; Lee, Yongbum
Author_Institution :
Dept. of Radiol. Technol., Niigata Univ., Japan
Abstract :
An approach to medical image enhancement is proposed. In this method, non-linear mapping functions are derived for projecting a set of discrete wavelet transform (DWT) coefficients to a new set of DWT coefficients. The mapped coefficients are then inverse wavelet transformed. Applications of the proposed method to the chest x-ray images and mammograms with subtle micro-calcifications are shown. To validate the effectiveness of the proposed method, we compared the results to those obtained by the fast Fourier transform (FFT) and the conventional wavelet-based (CWB) methods. Our preliminary results strongly suggest that the proposed method offers considerably improved enhancement capability over the FFT and CWB methods.
Keywords :
X-ray imaging; discrete wavelet transforms; image enhancement; mammography; medical image processing; nonlinear functions; FFT; chest x-ray images; discrete wavelet transform; fast Fourier transform; image enhancement; mammograms; medical imaging; nonlinear mapping functions; subtle microcalcifications; Biomedical imaging; Cities and towns; Discrete transforms; Discrete wavelet transforms; Fast Fourier transforms; Frequency; Image enhancement; Multiresolution analysis; Wavelet transforms; X-ray imaging;
Conference_Titel :
Neural Networks and Signal Processing, 2003. Proceedings of the 2003 International Conference on
Conference_Location :
Nanjing
Print_ISBN :
0-7803-7702-8
DOI :
10.1109/ICNNSP.2003.1281059
