Our exemplars for texture synthesis are extracted from one high
quality face model Me in the public facial performance sequence
ETH man from [4], as shown in (a) of Fig. 3. The face model is
accompanied with a high quality RGB texture Te.
While the example gradient image Ge can be computed from
Te easily using the Sobel operator, the computation of height map
He to encode the wrinkle geometry is not straightforward. To this
end, we deform a smooth neutral face, which is also provided in
this facial sequence, to match the selected expression model Me
and extract the height values to be stored in the He. The algorithm
to compute He can be separated into two steps: