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ESTG - Comunicações em conferências e congressos internacionais

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http://hdl.handle.net/10400.8/5644

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Percorrer ESTG - Comunicações em conferências e congressos internacionais por assunto "3-D and multi-view video"

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  • Efficient depth error concealment for 3D video over error-prone channels
    Publication . Marcelino, S.; Assunção, P.; Faria, Sérgio M. M. de; Soares, S.
    This paper addresses the problem of multivew videoplus-depth (MVD) decoding with corrupted depth maps due to transmission errors. A method for spatial error concealment of depth maps in MVD is proposed to efficiently recover lost blocks. The proposed method relies on the colour image and geometric curve fitting for accurate reconstruction of the lost contour segments in the corresponding depth map areas. Such reconstructed depth map contours are then used as boundaries at different depth planes to recover the missing depth values through weighted interpolation. The method performance is evaluated by the objective quality (PSNR) of the synthesised views. Images decoded with the reconstructed depth maps are compared with those of a reference method based on bidirectional interpolation. The proposed method exhibits PSNR gains up to 1.66dB higher than the reference one and better performance is consistently achieved for different visual content.
    2013-06Comunicação em conferência Acesso restrito Ver mais
  • Robust decoding of MDC depth maps for enhanced 3D video over hybrid broadcasting networks
    Publication . Marcelino, S.; Correia, P.; Faria, Sergio; Soares, S.; Assunção, Pedro
    This paper addresses the problem of robust decoding of 3D video over hybrid broadcast networks, using Multiple Description Coding (MDC). Despite the fact that MDC allowsdecoding of any description even when the others are lost in the multipath network, the resulting coarsely decoded depth maps produce unacceptable distortion in synthesised views. This is particularly harmful in the case of intra-coded depth slices because of subsequent error propagation. To achieve improved quality in the virtual views synthesised from MDC depth maps received with lost descriptions, a method is proposed based on the depth geometric information extracted from the received descriptions and also from texture motion. Accurate recovery of either lost or coarsely decoded depth slices from one single description, is achieved by jointly using motion information, depth map edges and spatially neighbouring depth values. Comparing with MDC decoding without enhanced reconstruction of lost descriptions, the proposed method reaches quality gains up to 2.29dB for loss rates of 10%.
    2016-06Comunicação em conferência Acesso restrito Ver mais