A multigrid-based shifted Laplacian preconditioner for a fourth-order Helmholtz discretization.
N. UmetaniScott P. MacLachlanCornelis W. OosterleePublished in: Numer. Linear Algebra Appl. (2009)
Keyphrases
- fourth order
- partial differential equations
- anisotropic diffusion
- high order
- edge preserving
- edge detection
- noise removal
- nonlinear diffusion
- multiscale
- image processing
- image interpolation
- level set
- image denoising
- image analysis
- multiresolution
- boundary conditions
- image enhancement
- higher order
- zero crossing
- diffusion process
- noisy images
- low frequency
- computer vision
- wavelet transform
- optical flow
- object recognition
- noise reduction
- flow field
- input image
- cost function