We present a progressive 3D registration framework that is a highly-efficient variant of classical non-rigid Iterative Closest Points (N-ICP). Since it uses the Laplace-Beltrami operator for deformation regularisation, we view the overall process as Laplacian ICP (L-ICP). This exploits a `small deformation per iteration' assumption and is progressively coarse-to-fine, employing an increasingly flexible deformation model, an increasing number of correspondence sets, and increasingly sophisticated correspondence estimation. Correspondence matching is only permitted within predefined vertex subsets derived from domain-specific feature extractors. Additionally, we present a new benchmark and a pair of evaluation metrics for 3D non-rigid registration, based on annotation transfer. We use this to evaluate our framework on a publicly-available dataset of 3D human head scans (Headspace). The method is robust and only requires a small fraction of the computation time compared to the most popular classical approach, yet has comparable registration performance.
|Title of host publication||International Conference on Automatic Face and Gesture Recognition 2023|
|Number of pages||8|
|Publication status||Published - 7 Jan 2023|
|Event||International Conference on Automatic Face and Gesture Recognition 2023 - Waikoloa Beach Marriott Resort, Waikoloa, Hawaii, United States|
Duration: 5 Jan 2023 → 8 Jan 2023
|Conference||International Conference on Automatic Face and Gesture Recognition 2023|
|Period||5/01/23 → 8/01/23|