Abstract: The present invention relates to a method of processing data contained in a digital input image. The data processing method comprises a gradient filter step (GF) of values (Y) of the pixels, which permits to detect (THR) a natural contour area (NC) inside the digital input image. The invention also comprises a step (BAD) of detecting blocking artifacts originating from a block-based coding technique, from a calculation (CT) of a discontinuity value based on values (Y) of a current pixel and of pixels adjacent to said current pixel. The method finally comprises a low-pass filter step (LPF) of the values (Y) of the pixels coming from the artifact blocking detection step (BAD) with the exception of the pixels contained in the natural contour areas (NC) determined by the gradient filter step.

Abstract: 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.

Abstract: The present invention relates to a method of processing data contained in a digital input image. The data processing method comprises a gradient filter step (GF) of values (Y) of the pixels, which permits to detect (THR) a natural contour area (NC) inside the digital input image. The invention also comprises a step (BAD) of detecting blocking artifacts originating from a block-based coding technique, from a calculation (CT) of a discontinuity value based on values (Y) of a current pixel and of pixels adjacent to said current pixel. The method finally comprises a low-pass filter step (LPF) of the values (Y) of the pixels coming from the artifact blocking detection step (BAD) with the exception of the pixels contained in the natural contour areas (NC) determined by the gradient filter step.

Abstract: 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.