1. Russ, J.C.: ‘The image processing handbook’, (CRC Press Boca Raton Florida 1998),3rd Edn.
2. Gonzalez, R.C., and Woods, R.E.: ‘Digital image processing’, (Addison-Wesley Publishing USA 1992)
3. Serra, J.: ‘Image analysis and mathematical morphology: Volume 1’, (Academic Press London 1982)