The present invention relates to a data processing method, which data are included
in an incoming digital image. This method comprises a calculation step (ACT) of
a spatial activity value of a current pixel based on values (Y) of said current
pixel and pixels adjacent thereto, a determination step (NND) of a non-natural
uniform area (NN) if the spatial activity value of various consecutive pixels is
lower than a first predetermined threshold value. The invention also includes a
gradient filter step (GF) of values (Y) of the pixels adapted to detect (THR1)
strong edges (SE) inside the image and a detection step (RD) of a ringing artifact.
The invention finally comprises a filter step (FIL) of values (Y) of the pixels
comprised in a filtering area which is located between a non-natural uniform area
(NN) and a strong edge (SE) which are close together and where at least a ringing
artifact has been detected.
