Browsing by Author "Marcelino, Sylvain"
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- Reconstruction of lost depth data in multiview video-plus-depth communications using geometric transformsPublication . Marcelino, Sylvain; Soares, Salviano; Faria, Sergio; Assunção, PedroThis paper addresses depth data recovery in multiview video-plus-depth communications affected by transmission errors and/or packet loss. The novel aspects of the proposed method rely on the use of geometric transforms and warping vectors, capable of capturing complex motion and view-dependent deformations, which are not efficiently handled by traditional motion and/or disparity compensation methods. By exploiting the geometric nature of depth information, a region matching approach combined with depth contour reconstruction is devised to achieve accurate interpolation of arbitrary shapes within lost regions of depth maps. The simulation results show that, for different packet loss rates, up to 20%, the depth maps recovered by the proposed method produce virtual views with better quality than existing methods based on motion information and spatial interpolation. An average PSNR gain of 1.48 dB is obtained in virtual views synthesised from depth maps using the proposed method.
- Spatial error concealment for intra-coded depth maps in multiview video-plus-depthPublication . Assunção, Pedro; Marcelino, Sylvain; Soares, Salviano; Faria, Sergio M. M. deTransmission errors or packet loss in depth maps have great impact on the decoding quality and view synthesis of 3D and multiview video. Thus efficient methods to recover corrupted depth data are critical functions for accurate view rendering. This paper pro poses an error concealment method for intra-coded depth maps, based on spatial intra and inter-view methods, which exploit neighbouring data of depth and colour images received error-free. A novel three-stage processing algorithm is devised to reconstruct sharp depth transitions (i.e. lost depth contours), using a disparity map and geometric interpolation based on parametric Bezier curves. The simulation results obtained from different views of various MVD sequences, for different packetisation modes and a wide range of packet loss rates (PLR), show that the proposed method consistently leads to quality improvement of synthesised images in comparison with reference methods.