IEEE Trans Image Process - Shape error concealment based on a shape-preserving boundary approximation.

Tópicos

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Resumo

In objectbased video representation, video scenes are composed of several arbitrarily shaped video objects (VOs), defined by their texture, shape and motion. In errorprone communications, packet loss results in missing information at the decoder. The impact of transmission errors is minimised through error concealment. In this paper, we propose a spatial error concealment technique for recovering lost shape data. We consider a geometric shape representation consisting of the object boundary, which can be extracted from the -plane. Missing macroblocks result in a broken boundary. A Bspline curve is constructed to replace a missing boundary segment, based on a T spline representation of the received boundary. We use Tsplines because they produce shapepreserving approximations and do not change the characteristics of the original boundary. The representation ensures a good estimation of the first derivatives at the points touching the missing segment. Applying smoothing conditions, we manage to construct a new spline that joins smoothly with the received boundary, leading to successful concealment results. Experimental results on object shapes with different concealment difficulty demonstrate the performance of the proposed method. Comparisons with prior proposed methods are also presented.

Resumo Limpo

objectbas video represent video scene compos sever arbitrarili shape video object vos defin textur shape motion errorpron communic packet loss result miss inform decod impact transmiss error minimis error conceal paper propos spatial error conceal techniqu recov lost shape data consid geometr shape represent consist object boundari can extract plane miss macroblock result broken boundari bspline curv construct replac miss boundari segment base t spline represent receiv boundari use tspline produc shapepreserv approxim chang characterist origin boundari represent ensur good estim first deriv point touch miss segment appli smooth condit manag construct new spline join smooth receiv boundari lead success conceal result experiment result object shape differ conceal difficulti demonstr perform propos method comparison prior propos method also present

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