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Data-driven models such as active contours in 2-D and deformable surfaces in 3-D have become prevalent in the computer vision community, particularly in the areas of shape tracking and shape recovery. They provide an important alternative to typical model-based recognition and tracking approaches that assume knowledge of the exact geometry of the object. Despite the power of these approaches, data- driven models often encode too little model information. As a consequence, active 3-D modeldoi:10.7282/t3-ksbg-by13 fatcat:ar5uevxoorew7lacbd6nl36dfy