Morphological video coder with conditional smoothing

In the context of coding the displaced frame difference signal in an image sequence. morphological segmentation is an alternative to linear methods such as the DCT. Although these non-linear approaches offer attractive features such as edge preservation and a lack of ringing, they can introduce artefacts such as spurious edges in the reconstructed video sequence. In this letter, a smoothing algorithm is described that reduces this problem and yields significant subjective quality improvements.