[1] [1] Rogowska J, Preston K, Sashin D. Evaluation of digital unsharp masking and local contrast stretching as applied to chest radiographs. IEEE Transactions on Medical Imaging,1988,35(10) :817 ～ 827

[2] [2] Polesel A,Ramponi G, Mathews V J. Image enhancement via adaptive unsharp masking. IEEE Transactions on Image Processing,2000,9(3) :505 ～ 510

[4] [4] Matozaki T, Tanishita A, IKeguchi T. Image enhancement of chest radiography using wavelet analysis. 18th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, Amsterdam, 1996

[5] [5] Chang Dah-Chung, Rong Wen. Image contrast enhancement based on a histogram transformation of local standard deviation. IEEE Transactions on Medical Imaging, 1998,17(4) :518 ～531

[6] [6] Laine A, Fan J, Yang W. Wavelets for contrast enhancement of digital mammography. IEEE engineering in Medicine and Biology, 1995,14 (5): 536 ～ 531