1. Davies, E.R.: ‘Machine vision: theory, algorithms, practicalities’, (Morgan Kaufmann, San Francisco, CA 2005),3rd edn.
2. Adaptive and vector directional processing applied to video colour images
3. Vector median filters
4. Accuracy of multichannel median filter
5. Plataniotis, K.N., and Venetsanopoulos, A.N.: ‘Vector filtering’, Sangwine, S.J., Horne, R.E.N., Sangwine, S.J., Horne, R.E.N., The colour image processing handbook, (Chapman & Hall, London, UK 1998),Chap. 10