Abstract: How to measure the height of a moving human from a video sequence? To solve this problem, a real-time automatic method is proposed. Firstly, a new kind of head feature point and a new kind of feet feature point are extracted in each frame of the input video sequence. Then, these extracted feature points are used to construct several constraint equations to compute the approximate human height, meanwhile the feet are tracked in the video sequence. Finally, based on the tracking results, the measurement result is refined with an introduced geometry constraint on the spatial points corresponding to the extracted feature points. Compared with many previous measurement methods, the proposed method is more accurate and robust because the motion information in the video sequence is utilized effectively, and it can handle the video sequences obtained from both a perspective camera and a fish-eye camera. Moreover, it is a real-time measurement method which has lower computational cost. Experiments demonstrate the effectiveness and the real-time capability of the proposed method.