1. Gonzalez, R.C., Woods, R.E.: Digital image processing. Prentice-Hall, Upper Saddle River (2008).
2. Shapiro, L., Stockman, G.: Computer Vision. Prentice Hall (2001).
3. Jain, P., Tyagi, V.: Spatial and frequency domain filters for restoration of noisy images. IETE Journal of Education 54(2), 108–116 (2013).
4. Jain, P., Tyagi, V.: A survey of edge-preserving image denoising methods. Information Systems Frontiers, 1–12 (2014), doi: 10.1007/s10796-014-9527-0 .
5. Donoho, D.L., Johnstone, I. M.: Ideal spatial adaptation via wavelet shrinkage. Biometrika 81, 425–455 (1994).