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Such models are used for 3D head pose estimation, face analysis, face recognition and facial landmark detection and tracking.
About
Each of our face models is created from a set of 3D face scans. Each scan is in the form of a graph, where the vertices are locations on the surface of the face, and the edges connect the vertices to form a triangulated mesh. Each vertex also has a colour; hence the vertices define both the shape and the texture of a face. Each face is registered to a standard mesh, so that each vertex has the same location on any registered face. The model has two components: (i) a mesh consisting of the mean face, and (ii) two matrices, one each for shape and texture that describe the various modes of variations from the mean. The number of modes of variation depends on the size of the mesh, and also is different for shape and texture. Hence the appearance of a given face can be summarised by a set of coefficients that describe how much there is of each mode of variation.