Head Tracking Using a Textured Polygonal Model
Arno Schödl, Antonio de Haro Bailón, Irfan A. Essa · 1998
We describe the use of a three-dimensional textured model of the human head under perspective projection to track a person's face. The system is hand-initialized by projecting an image of the face onto a polygonal head model. Tracking is achieved by finding the six translation and rotation parameters to register the rendered images of the textured model with the video images. We find the parameters by mapping the derivative of the error with respect to the parameters to intensity gradients in the image. We use a robust estimator to pool the information and do gradient descent to find an error minimum. 1. Introduction Head tracking is an important processing step for many vision-driven interactive user interfaces. The obtained position and orientation allow for pose determination and recognition of simple gestures such as nodding and head shaking. The stabilized image obtained by perspective dewarping of the facial image according to the acquired parameters is ideal for facial expressi...