It is relatively robust with respect to changes in viewpoint, scale, and shading, The color segmentation is computationally fast because it generally includes a simple thresholding in chrominance space.
Skin color offers an effective and efficient way to segment hand regions out.
Many different color spaces, such as RGB, HSV, N RGB, have been used in current research. Kjeldsen, R., and Kender, J. 1996. Finding skin in color images . The core of color tracking is color based segmentation. Since color space is quantized by the structure of the histogram, this technique shares the same problem with non parametric density estimation, in which the level of quantization will affect the estimation.