Real Time Feature-Based Facial Tracking Using Lie Algebras(Special Issue on Machine Vision Applications)

概要

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We have developed a novel human facial tracking system that operates in real time at a video frame rate without needing any special hardware. The approach is based on the use of Lie algebra, and uses three-dimensional feature points on the targeted human face. It is assumed that the roughly estimated facial model(relative coordinates of the three-dimentional feature points)is known. First, the initial feature positions of the face are determined using a model fitting technique. Then, the tracking is operated by the following sequence: (1)capture the new video frame and render feature points to the image plane; (2)search for new positions of the feature points on the image plane; (3)get the Euclidean metrix from the moving vector and the three-dimentional information for the points; and(4)rotate and translate the feature points by using the Euclidean matrix, and render the new points on the image plane. The key algorithm of this tracker is to estimate the Euclidean matrix by using a least sequare technique based on Lie algebra. The resulting tracker performed very well on the task of tracking a human face.
社団法人電子情報通信学会の論文
2001-12-01