Koninklijke Philips Corporation N.V.

Françoise Groliere

Daniel Snook

Marc Drieux

The present invention relates to an encoding method processing video object planes (VOPs) of I, P or B type and including a dynamic allocation of said VOPs. According to said method, for each input frame a preliminary forward motion estimation is carried out between current and previous frames. Current and previous motion fields are then used to evaluate a coherence factor, expressed as connected to the sums of local differences within current and previous motion field. According to the value of the coherence factor with respect to an empirically determined threshold, a decision is finally taken on the type of the frame to be coded.

Video encoding method

Quantization in video coding is a lossy treatment and has as its main result that blocking artefacts occur at the boundary of two blocks during the decoding process. The invention relates to a method of removing these blocking artefacts. It implements a filtering step in the decoding process applied to a segment of pixels phaddling the boundary, which segment has pixels at the ends (R, L) that agree with a chrominance similarity criterion (step), i.e. filtering is applied to segments for which the pixels at the ends have similar colors.

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Nogent-Sur-Marne, France

Françoise Groliere