In this paper, first a head-tracking algorithm using assembled features and the character of motion continuity (HTA-AC) is proposed. It has been proved to be more robust and effective than existing algorithms. Second, based on the latest research results of newly developed nonlinear dimensionality reduction theory, a theoretic head-tracking algorithm (T-HTA) is proposed for the first time. The tracking results of these two algorithms have something in common and indicates that our practical new head-tracking algorithm (HTA-AC) has some mathematically intrinsic meanings. Third, a complicated mobile robotic system of human height was built up in our lab. It has independent hardware and software controls on the body and head of the robot. The system is used to validate our HTA-AC.
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