A temporal error concealment algorithm for H.264/AVC based on edge directions

This paper proposes a temporal error concealment algorithm based on the edge directions of the pixels surrounding the lost macroblock (MB). On one hand, for each pixel on the external boundary of the restored MB, the spatial boundary distortion is calculated along the edge direction, which preserves edge alignment as well as ensures spatial continuity. On the other hand, the edge directions are utilized to identify whether the lost MB contains multiple objects, and then determine the restore mode of the four 8 × 8 blocks in the lost MB: simultaneously or independently. The experimental results for several test video sequences demonstrate that higher performance is achieved in both objective and subjective quality of the reconstructed frames compared with conventional error concealment algorithms.