1. Gonzalez, R., Woods, R.: Digital Image Processing. Pearson Prentice Hall, Upper Saddle River (2008)
2. Jain, P., Tyagi, V.: Spatial and frequency domain filters for restoration of noisy images. IETE J. Edu. 54(2), 108–116 (2013)
3. Khmag, A., Ramli, A., Hashim, S., Al-Haddad, S.A.R.: Additive noise reduction in natural images using second-generation wavelet transform hidden Markov models. IEEJ Trans. Electr. Electron. Eng. 11(3), 257–265 (2015)
4. Buades, A., Coll, B., Morel, J.-M.: A non-local algorithm for image denoising. IEEE Conf. Comput. Soc. Comput. Vis. Pattern Recognit. 2, 60–65 (2005)
5. Ko, S.-J., Lee, Y.H.: Center weighted median filters and their applications to image enhancement. IEEE Trans. Circuits Syst. 38(9), 984–993 (1991)