1. FindBiometrics, Faceial recognition, [Online], Available at:
http://findbiometrics.com/solutions/facial-recognition/
2. Steve Mann, “Intelligent Image Processing”, Wiley-Interscience 2002.
3. Walter G. Kropatsh, “Digital Image Analysis”, Springer 2002.
4. Wikipedia, HSL and HSV [Online], Available at:
http://en.wikipedia.org/wiki/HSL_and_HSV
5. Image Processing Learning Resources, HIPR2, Dilation, [Online], Available at
http://homepages.inf.ed.ac.uk/rbf/HIPR2/dilate.htm
.