A novel temporal concealment approach using a mesh-based motion compensation scheme

Concealment techniques aim at masking the visual effect of data losses and errors, by exploiting either spatially or temporally correlated information. Both temporal and spatial approaches present drawbacks: the first is in general inefficient in handling complex or fast objects' motion, while the second is computationally expensive and is not able to recover high-frequency contents and small details. In this paper a new solution is proposed that combines temporal and spatial approaches. The technique first replaces the lost block with the best matching pattern in a previously decoded frame, using the border information, and then applies a mesh-based warping that reduces the artifacts caused by fast movements, rotations or deformations. Experimental results show that significant improvements can be achieved in comparison with traditional spatial or temporal concealment approaches, in terms of both subjective and objective reconstruction quality.