Digital Chest Image Enhancement using Wavelet-coefficient Mapping Functions

D.-Y. Tsai, Y. Lee, M. Sekiya, and K. Kojima (Japan)


medical imaging, wavelet transform, image enhancement, chest images


This paper presents a wavelet-based method for enhancement of digital chest radiographs. In the proposed method, non-linear mapping functions are derived for mapping a set of wavelet-transformed coefficients to a new set of coefficients. The mapped coefficients are then inverse wavelet transformed. We compare the results to that obtained using the fast Fourier transform (FFT) based method and a conventional wavelet-based method. The results show that the proposed method is superior to the FFT and the conventional wavelet-based methods in enhancing the edges of ribs, bronchus, and pulmonary vessels without a significant enhancement of noise.

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