Abstract
The video-plus-depth data representation uses a regular texture video enriched with the so-called depth map, providing the depth distance for each pixel. The compression efficiency is usually higher for smooth, gray level data representing the depth map than for classical video texture. However, improvements of the coding efficiency are still possible, taking into account the fact that the video and the depth map sequences are strongly correlated. Classically, the correlation between the texture motion vectors and the depth map motion vectors is not exploited in the coding process. The aim of this paper is to reduce the amount of information for describing the motion of the texture video and of the depth map sequences by sharing one common motion vector field. Furthermore, in the literature, the bitrate control scheme generally fixes for the depth map sequence a percentage of 20% of the texture stream bitrate. However, this fixed percentage can affect the depth coding efficiency, and it should also depend on the content of each sequence. We propose a new bitrate allocation strategy between the texture and its associated per-pixel depth information. We provide comparative analysis to measure the quality of the resulting sequences.
Highlights
Three-dimensional television (3DTV), as the revolution in visual technology, promises to bring to the customers a new generation of services
Our experiments evaluate the proposed motion estimation and bitrate allocation methods on two types of sequences providing a conventional video enriched with a depth map sequence
This paper presented a novel method for the coding the video-plus-depth data by means of a joint estimation of the motion vectors (MVs) field for the texture motion information and the depth map sequence
Summary
Three-dimensional television (3DTV), as the revolution in visual technology, promises to bring to the customers a new generation of services. Enjoy three-dimensional entertainments without wearing special additional glasses, navigate freely around a sportive show, to name but a few of the new promising 3DTV applications. Another target fields can be expected, like digital cinema, IMAX theaters, medicine, dentistry, air traffic control, military technologies, computer games, and so on. The video-plus-depth data representation uses a regular color video enriched with the depth map providing the Z-distance for each pixel (Figure 1) This format is currently standardized by the motion pictures experts group (MPEG) within the MPEG-C part 3 framework [8] of the compression of the per pixel depth information within a conventional MPEG-2 transport stream
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