Ringing artifacts are removed from a quantized image by an image de-ringing filter that includes a determination unit, an adaptive filter and a nonlinear low-pass filter. The determination unit determines whether each selected pixel of a first set of selected pixels of an image contains a ringing artifact...http://www.google.fr/patents/US7430337?utm_source=gb-gplus-shareBrevet US7430337 - System and method for removing ringing artifacts
