Video Stabilization
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‘‘patch discovery’’ and ‘‘vertex insertion.’’ The decoder uses the received degree information and the current tags to discover the border of the patch and insert the new vertex.
Cross-References ▶ Middleware for Streaming 3D Meshes
References 1.
P. Alliez and M. Desbrun, ‘‘Progressive compression for lossless transmission of triangle meshes,’’ Proceedings of SIGGRAPH 01. J. Rossignac, ‘‘Handbook of Discrete and Computational Geometry,’’ CRC, Chap. 54.
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VC-1 Video Compression Definition VC-1 is a video codec developed for broadcast interlaced video as well as progressive video by Microsoft. VC-1 is derived from Microsoft’s proprietary WMV-9 but awaits SMPTE ratification. VC-1 is pure
Vertex removal & retrangulation
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Valence-Driven Conquest. Figure 1. Valence-driven vertex removal and retriangulation.
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VC-1 Video Compression
video compression technology, and is expected to be deployed as key engines in satellite TV, IP set-tops, and high-definition DVD recorders.
Simple and Main Profiles for VC-1 Video The Simple and Main Profiles (SP/MP) of VC-1 are supposed to be the same as those of WMV-9 in progressive compression, respectively. However, there is no Advanced Profile (AP) in WMV-9 to compare with VC-1 AP. VC-1 AP mainly focuses on interlaced video compression technology. And, the interlace tools cannot be compared directly in both standards. Even the starting point is different – the input format is YUV4:1:1 for WMV-9, but is YUV4:2:0 for VC-1. Note that only Field-based prediction and Frame-based prediction are selectively applied in each MB in the interlace tool of WMV-9. This tool is applied when the INTERLACE flag is turned on in the Sequence header.
Advanced Profile for VC-1 Video The number of B frames is not fixed between two references in VC-1, while it is a constant value that can be found in the Sequence header in WMV-9. New distance value comes into the Picture Structure at Entry- point Layer with REFDIST_FLAG. REFDIST data indicates the number of frames between the current frame and reference one. Progressive-Picture/ Frame-Picture/Field-Picture can be mixed in a video. It is the encoder job to construct each picture with a FCM (Frame Coding Mode). The maximum number of references is two for P Field-Picture. The references are specified in Picture layer. If both two references are selected, the selection of reference information is described in MB level and Block level. The number of references is always four for B Field-Picture – no Picture layer selection is needed. So, the selection of reference is always in MB level and Block level. Note that one of reference fields for bottom field in a B frame is its top field itself. P Field-Picture has two MC modes (1 MV with 16 16, 4 MV with 8 8). B Field-Picture has three MC modes (1 MV with 16 16 in forward or backward modes, 2 MV with 16 16 in interpolative or direct modes, 4 MV with 8 8 only in forward or backward modes). P Frame-Picture has 4 MC modes (1 MV Fr
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