[1] DONOHO D L. Denoising by softthresholding［J］. IEEE Transactions on Information Theory, 1995, 41(3): 613627.

[2] CROUSE M S, NOWAK R D, BARANIUK R G. Waveletbased statistical signal processing using hidden Markov models［J］. IEEE Transactions on Signal Processing, 1998, 46(4): 886902.

[3] LEVENT S, IVAN W S. Bivariate shrinkage with local variance estimation［J］. IEEE Signal Processing Letters, 2002, 9(12): 438441.

[4] CHO D, BUI T D. Multivariate statistical modeling for image denoising using wavelet transforms［J］. IEEE Transactions on Signal Processing Image Communication, 2005, 20(1): 7789.

[5] JIAO Licheng, TAN Shan. Development and prospect of image multiscale geometric analysis［J］. Acta Electronica Sinica, 2003, 31(12A): 19751981.

[6] DO M N, VETTERLI M. The Contourlet transform: an efficient directional multiresolution image representation［J］. IEEE Transactions on Image Processing, 2005, 14(12): 20912106.

[7] CUNHA A L, Zhou Jianping, DO M N. The Nonsubsampled Contourlet Transform: theory, design and application［J］. IEEE Transactions on Image Processing, 2006, 15(10): 30893101.

[8] DAI Wei, YU Shenglin, SUN Shuan. Image denoising algorithm using adaptive threshold based on contourlet transform［J］. Acta Electronica Sinica, 2007, 35(10): 19391943.

[9] ZENG Yezhan, QIAN Shengyou, LIU Chang, et al. Image denoising algorithm using adaptive threshold based on nonsubsampled Contourlet transform［J］. ComputerEngineering and Applications, 2010, 46(10): 157159.

[10] FENG Hongxiao, HOU Biao. JIAO Licheng, et al. SAR image despeckling based on local Gaussian model and MAP in NSCT domain［J］. Acta Electronica Sinica, 2010, 38(4): 811816.

[11] JIA Jian, JIAO Licheng, XIANG Hailin. Using bivariate threshold function for image denoising in NSCT domain［J］. Journal of Electronics & Information Technology, 2009, 31(3): 532536.

[12] LEWIS A S, KNOWLES G. Image compressing using the 2D wavelet transform［J］. IEEE Transactions on Image Processing(10577149), 1992, 1(2): 224250.

[13] POD D Y, DO M N. Directional multiscale modeling of image using the Contourlet Transform［J］. IEEE Trans.on Image Processing(10577149), 2006, 6(15): 16101620.

[14] CHANG S G, YU Bin, VETTERLI Martin. Adaptive wavelet thresholding for image denoising and compression［J］. IEEE Transactions on Image Processing(10577149), 2000, 9(9): 15321546.

[15] BURCE A G, GAO H Y. Understanding waveshrink: variance and bias estimation［J］. Biometrika(00063444), 1996, 83(4): 727745.

[16] PORTILLA J, STRLA V. Image denoising using scale mixtures of Gaussians in the wavelet domain［J］. IEEE Transactions on Image Processing(10577149), 2003, 12(11): 13381351.

[17] ALESSANDROA F, VLADIMIR K, KAREN E. Pointwise shape adaptive DCT for high quality denoising and deblocking of grayscale and color images［J］. IEEE Transactions on Image Processing(10577149), 2007, 16(5): 13951411.

[18] MICHAEL E. Image denoising via sparse and redundant representations over learned dictionaries［J］. IEEE Transactions on Image Processing(10577149), 2006, 15(12): 37363745.

[19] ZHOU W, BOVIK A C, et al. Image quality assessment: from error visibility to structural similarity［J］. IEEE Transactions on Image Processing (10577149), 2004, 13(4): 600612.