Morphological shape representation for very low bit-rate video coding |
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Authors: | Patrick Brigger Murat Kunt |
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Affiliation: | Signal processing Laboratory, Swiss Federal Institute of Technology (EPFL), Ecublens, CH-1015, Lausanne, Switzerland |
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Abstract: | Region-based coding schemes are among the most promising compression techniques for very low bit-rate applications. They consist of image segmentation, contour and texture coding. This paper deals with the use of the geodesic skeleton as a morphological tool for contour coding of segmented image sequences. In the geodesic case, already coded and known regions are taken into account for the coding of contours of unknown regions. A new technique is presented for the entropy coding of the coordinates of the skeleton points exploiting their special spatial distribution. Furthermore, a fast algorithm for the reconstruction of the skeleton points is given based on hierarchical queues. In the case of numerous isolated contour arcs (for example error coding in a motion prediction loop), the geodesic skeleton proofs higher efficiency than traditional methods. Results at very low bit-rates are presented and compared to standard methods confirming the validity of the chosen approach. |
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Keywords: | Contour-texture image representation Very low bit-rate mathematical morphology Morphological skeleton, Geodesy |
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