MPEG-2 Error Concealment Based on Block-Matching Principles Sofia Tsekeridou and Ioannis Pitas IEEE...
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Transcript of MPEG-2 Error Concealment Based on Block-Matching Principles Sofia Tsekeridou and Ioannis Pitas IEEE...
MPEG-2 Error Concealment Based on
Block-Matching Principles
Sofia Tsekeridou and Ioannis PitasIEEE Transactions on Circuits and Systems for Video Technology, June 200
0
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.