Abstract
The concept of the H1 projections for an adaptive generation of a continuous approximation of an input 3D image in the finite element (FE) framework is describe and utilized in this paper. Such an approximation, along with a corresponding FE mesh, can be interpreted and used as an input data for FE solvers. In order to capture FE solution gradients properly, specific refined meshes have to be created. The projection operator is applied iteratively on a series of increasingly refined meshes, resulting in an improving fidelity of the approximation. A developed algorithm for linking image processing to the 3D FEM code is also presented within the paper. In particular we compare hp-adaptive algorithm with h-adaptivity, concluding that hp-adaptivity for three dimensional approximation of non-continuous data loses its exponential convergence. Finally conclusions with the evaluation and discussion of the numerical results for an exemplary problem and convergence rates obtained for described problem are described.