1. Introduction
3D reconstruction from a single image and a template (a known 3D view of the surface) has been researched actively over the past decade. We here call this problem Shape-from-Template (SfT). Recovering the 3D deformation is equivalent to recovering the shape as seen in the input image. Solving SfT requires one to constrain the space of possible 3D deformations between the template and the unknown shape. An important instance of SfT is IsoSfT where the 3D deformation is distance-preserving, in other words, an isometry. IsoSfT has been the most studied instance of SfT [2], [3], [4], [6], [8], [10] and was shown to generally admit a unique solution [2]. Importantly, most previous work assume known intrinsic camera calibration.