If we want to implement a gesture interface which is more interactive, the position
locating of important features of hand will be the most important task to do. Unlike
fingertips, palm center doesn’t have apparent characteristic. Many researches have
defined the palm center in many different ways, but they can only be effective in
certain conditions. Some will be ineffective if the fore-arm is included and some will
be ineffective when the palm is tilted or rotated