Some references for skin colours:
- Finding Naked People Fleck et al, 1996
- Face Segmentation Using Skin-Color Map in Videophone Applications Douglas Chai and King N. Ngan, 1999
- Face Detection in Color Images Rein-Lien Hsu, Mohamed Abdel-Mottaleb, and Anil K. Jain, 2002
- Self-Adaptive Image Cropping for Small Displays Ciocca et al, 2007.
- A New Colour Space for Skin Tone Detection Abbas Cheddad, Joan Condell, Kevin Curran and Paul McKevitt, 2009.
- Minimizing false detection of skin color by using background subtraction Gen LI, Jae Kyu Suhr, Dongik Kim, Ho Gi Jung, Jaihie Kim, 2010
- A Dynamic Threshold Approach for Skin Segmentation in Color Images Pratheepan Yogarajah, Joan Condell, Kevin Curran, Abbas Cheddad and Paul McKevitt, 2010
- Survey on Skin Tone Detection using Color Spaces C. Prema and D. Manimegalai, 2012.
- A Novel Skin Tone Detection using Hybrid Approach by New Color Space C. Prema and D. Manimegalai, 2012.