Hierarchical Matrix Approximations of Hessians Arising in Inverse Problems Governed by PDEs.
Ilona AmbartsumyanWajih Bou KaramTan Bui-ThanhOmar GhattasDavid E. KeyesGeorg StadlerGeorge TurkiyyahStefano ZampiniPublished in: CoRR (2020)
Keyphrases
- inverse problems
- partial differential equations
- image reconstruction
- global optimization
- convex optimization
- image denoising
- emission tomography
- anisotropic diffusion
- image processing
- early vision
- level set
- optimization methods
- optimization problems
- multiscale
- image enhancement
- energy functional
- natural images
- nonlinear diffusion
- high quality
- coarse to fine
- high order
- smoothness constraint
- edge detection
- computationally efficient
- structure tensor
- computer vision