Papers Accepted
Abstract:
Recently fourth order equations of the form
u_t = -\nabla\cdot(({\mathcal G}(J_\sigma u)) \nabla \Delta
u) have been proposed
for noise reduction and simplification of two dimensional
images.
The operator \mathcal G is a nonlinear functional involving
the gradient or Hessian of its argument, with decay in the
far field.
The operator J_\sigma is a standard mollifier.
Using ODE methods on Sobolev spaces,
we prove existence and uniqueness of solutions of this
problem
for H^1 initial data.