1. Gonzalez RC, Woods RE (2002) Digital image processing, 2nd edn. Prentice-Hall, Englewood Cliffs, NJ
2. Jain AK (1989) Fundamentals of digital image processing. Prentice-Hall, Englewood Cliffs, NJ
3. Kulkarni RK Thesis novel restoration techniques for images corrupted with high density impulsive noise. NIT Rourkela
4. Zhi X (2008) An anisotropic diffusion filter for ultrasonic speckle reduction
5. Achim A, Bezerianos A, Tsakalides P (2001) Novel Bayesian multiscale method for speckle removal in medical ultrasound images. IEEE Trans Med Imag 20:772–783