Elliptical Head Tracking Using Intensity Gradients and Color Histograms

An algorithm for tracking a person's head is presented. The head's projection onto the image plane is modeled as an ellipse whose position and size are continually updated by a local search combining the output of a module concentrating on the intensity gradient around the ellipse's perimeter withthat of another module focusingon the color histogram of the ellipse's interior. Since these two modules have roughly orthogonal failure modes, they serve to complement one another. The result is a robust, real-time system that is able to track a person's head with enough accuracy to automatically control the camera's pan, tilt, and zoom in order to keep the person centered in the field of view at a desired size. Extensive experimentation shows the algorithm's robustness with respect to full 360-degree out-of-plane rotation, up to 90-degree tilting, severe but brief occlusion, arbitrary camera movement, and multiple moving people in the background. IEEE Conf...

• Type: Conference
• Year: 1998
• Where: CVPR
• Authors: Stan Birchfield
• Keywords: 360-degree Out-of-plane Rotation, Arbitrary Camera Movement, Computer Vision, CVPR 1998, IEEE Conference, Multiple Moving People, Orthogonal Failure Modes