Algorithm 2 Extraction of fingertips and fingers

Input: The palm center $M_0$ and contour point set $mContour$ Output: The $mFingertips$ and $mFingers$ Begin Step1: Initialize the sets of $candSet$, $mFingertips$ and $mFingers;$   Step2: Calculate the average distance $R_{avg}$ from $M_0$ to all the points in $mContour$;    Step3: Add those points to $candSet$, if their distances from $M_0$ greater than or equal to $R_{avg}$;    Step4: For each of the elements in $candSet$, compute its distance from $M_0$. Then find the one corresponding to the largest distance and move it to both $mFingertips$ and $mFingers$, and move all the rest points that are connected with it in the $candSet$ to $mFingers$;    Step5: Go to Step4 and repeat until $candSet$ is empty;    Step6: The fingertips and fingers are obtained in $mFingertips$ and $mFingers$. End