GREYCstoration is an image regularization
algorithm that processes an image by locally
removing small variations of pixel intensities
while preserving significant global image
features, such as sharp edges and corners.
The most direct application is denoising. By
extension, it can also be used to inpaint or
resize images. It is based on methods using
nonlinear multi-valued diffusion PDEs (Partial
Differential Equations) for image
regularization. This kind of method generally
outperforms basic image filtering techniques
(such as convolution, median filtering, etc.)
classically encountered in painting programs.
Other image denoising plugins are available,
but are not free, and the corresponding
algorithms are kept secret.
