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Evaluation of the robustness of the registration method. The average face of either gender is used as the reference to register the sample surface, and the registration results are compared. (a) The average face of male Han Chinese, (b) The sample face to be registered, (c) The average face of female Han Chinese, (d) The comparison of the two registration results. The differences are represented in color gradients, with the darker colors denoting greater pointwise differences.
