Edge-enhancing diffusion (EED) can reconstruct a close approximation of an original image from a small subset of its pixels. This makes it an attractive foundation for PDE based image compression. In this work, we generalize second-order EED to a fourth-order counterpart. It involves a fourth-order diffusion tensor that is constructed from the regularized image gradient in a similar way as in traditional second-order EED, permitting diffusion along edges, while applying a non-linear diffusivity function across them. We show that our fourth-order diffusion tensor formalism provides a unifying framework for all previous anisotropic fourth-order diffusion based methods, and that it provides additional flexibility. We achieve an efficient implementation using a fast semi-iterative scheme. Experimental results on natural and medical images suggest that our novel fourth-order method produces more accurate reconstructions compared to the existing second-order EED.
CITATION STYLE
Jumakulyyev, I., & Schultz, T. (2021). Fourth-Order Anisotropic Diffusion for Inpainting and Image Compression. In Mathematics and Visualization (pp. 99–124). Springer Science and Business Media Deutschland GmbH. https://doi.org/10.1007/978-3-030-56215-1_5
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