MPEG-2 Error Concealment Based on

Block-Matching Principles

Sofia Tsekeridou and Ioannis PitasIEEE Transactions on Circuits and Systems for Video Technology, June 200

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Best Match

• Region similarity evaluation

– MAD smaller than a predefined threshold

• Statistical behavior evaluation

– Difference of Top and Bottom mean must in between Q*variance (Q set to 0.5)

Error Concealment in this paper

• Spatial method– Split-match EC method (for intra-frame

concealment)

• Temporal method– forward-backward block-matching EC method

(F-B BM EC)

First Intra-Frame EC

• Bilinear Interpolation– From Existing Top and Bottom MBT, MBB

• Spatial Anisotropic Diffusion EC– Diffusion of the surrounding image content to t

he lost areas with edge preservation

• Spatial Split Match EC Method

Spatial Split-Match EC Method

copy copy

Intra-/Inter-Frame EC

• Zero motion EC (ZM EC)

• Motion-compensation EC (MC EC)– Average neighboring motion vectors (intra

coded frame has no MV->ZM)

• Adaptive EC– When spatial activity is high, apply temporal

MC EC ;when temporal activity is high, apply spatial interpolation.

Experiments

Flower Garden PER=0.01

Flower Garden PER=0.1

Mobil & Calendar PER=0.01

Mobil & Calendar PER=0.1

Tunnel PER=0.01

Tunnel PER=0.1

SD EC SVI EC

Adaptive ECF-B BM EC

MC EC

Adaptive ECF-B BM EC

MC EC

Conclusion

• Appling the spatial split-match EC method to the first I-frame of a sequence or a scene and uses the temporal F-B BM EC method to the other frames.

• Succeeding in reconstructing edges or lines of various orientations, textures and other spatial details in a smooth and continuous way.