An And-Or Graph Model for Face Representation, Sketching and Aging

For face modeling, an And-Or graph model was first proposed in [9] as a compositional representation for high resolution face images. In an And-Or graph, the And nodes represent coarse-to-fine decompositions and the Or-nodes represent alternative components for diversity. The And-Or graph face model, as Fig.1 illustrates, has three levels: the first level describes the general appearance of global face and hair; the second level refines the representation of the facial components (eyes, eye brows, nose, mouth) by modeling the variations of their shapes and subtle appearance; and the third level provides further details of the face components and divides the face skin into 9 zones where the wrinkles and speckles are represented. The And-Or graph provides a expressive model for face diversity and details, and thus is found to be especially efficient for applications in face sketching generation and face aging simulation.