/*-----------------------------------------------------------------------------    File        : greycstoration.cpp    Description : GREYCstoration - A tool to denoise, inpaint and resize images.    The GREYCstoration algorithm is an implementation of diffusion tensor-directed    diffusion PDE's for image regularization and interpolation, published in    "Fast Anisotropic Smoothing of Multi-Valued Images    using Curvature-Preserving PDE's"    (D. Tschumperl