An algebraic multigrid based shifted-Laplacian preconditioner for the Helmholtz equation.
Tuomas AiraksinenErkki HeikkolaAnssi PennanenJari ToivanenPublished in: J. Comput. Phys. (2007)
Keyphrases
- numerical methods
- multiscale
- multiresolution
- image analysis
- iterative methods
- boundary conditions
- differential equations
- edge preserving
- video matting
- low frequency
- partial differential equations
- computationally expensive
- numerical solution
- linear systems
- emission tomography
- boundary value problem
- image restoration
- zero crossing
- graph laplacian
- edge detection
- generalized gaussian
- flow field
- nonlinear equations
- coarse to fine
- shape from shading