Boyle, R. D. and Thomas, R. C., Computer Vision:  A First Course 
	Blackwell Scientific Publications, 1988.

Castleman, K. R., Digital Image Processing  Prentice Hall, 1996.

Sonka, M., Hlavac, V., and Boyle, R.  Image Processing, Analysis, 
	and Machine Vision Chapman and Hall Computing, 1993.