Improving Image Quality in Medical Images Using a Combined Method of Undecimated Wavelet Transform and Wavelet Coefficient Mapping
Figure 6
An example showing pixel-value profiles from original and processed chest radiographs. (a)–(c) Original versus processed by the proposed method, the modified UDWT method, and the sigmoid-type wavelet coefficient mapping method, respectively. The profiles were measured along the horizontal lines (black lines) as shown in Figures 5(a)–5(c). (d)–(f) Corresponding magnified profiles indicated by circles as shown in (a)–(c), respectively. (g) Profiles of two processed images; the solid line indicates the profile of an image processed by the modified UDWT method, and the dotted line indicates that by the proposed method. (h) Profiles of two processed images; the solid line indicates the profile of an image processed by the sigmoid-type wavelet coefficient mapping method, and the dotted line indicates that by the proposed method.
