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This paper presents a novel approach for estimating 3D head pose in single-view video sequences acquired by an uncalibrated camera. Following the initialization by a face detector, a tracking technique localizes the faces in each frame in the video sequence. Head pose estimation is performed by using a structure from motion and self-calibration technique in a sequential way. The proposed method was applied to the IDIAP database that contains head pose ground truth data. The obtained results demonstrate that the method can estimate the head pose with satisfying accuracy.