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motion estimation and compensation for very low bitrate video coding

motion estimation and compensation for very low bitrate video coding

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3.2.3.1 Data Structures :::::::::::::: 89<br />

3.2.3.2 State Transitions :::::::::::::: 89<br />

3.2.4 Experimental Results :::::::::::::::: 92<br />

3.3 Conclusion :::::::::::::::::::::::::: 92<br />

4 Image Pre-Processing <strong>for</strong> VLBR Video Coding 95<br />

4.1 Intuitive Rationale :::::::::::::::::::::: 96<br />

4.2 Rate Distortion Conditions :::::::::::::::::101<br />

4.2.1 Image Model :::::::::::::::::::::101<br />

4.2.2 Intra Coding of Images :::::::::::::::102<br />

4.2.3 Inter Coding without Motion Compensation ::::103<br />

4.2.3.1 Usual Scheme :::::::::::::::104<br />

4.2.3.2 Proposed Scheme :::::::::::::105<br />

4.2.4 Inter Coding with Motion Compensation :::::105<br />

4.2.5 Theoretical Conclusion ::::::::::::::::106<br />

4.3 Experimental Results :::::::::::::::::::::107<br />

4.4 Conclusion ::::::::::::::::::::::::::119<br />

5 Mesh-Based Motion Compensation 121<br />

5.1 Estimation, Transcription <strong>and</strong> Reconstruction :::::::123<br />

5.1.1 The Proposed Reconstruction ::::::::::::123<br />

5.1.2 Problems to be Addressed ::::::::::::::124<br />

5.1.2.1 Mesh Vertices :::::::::::::::125<br />

5.1.2.2 Motion Interpolation :::::::::::127<br />

5.1.2.3 Reversing the Motion In<strong>for</strong>mation ::::128<br />

5.2 Mesh Design :::::::::::::::::::::::::128<br />

5.2.1 Detecting Edges :::::::::::::::::::130<br />

5.2.1.1 Enhancing Image Boundaries :::::::130<br />

5.2.1.2 Fol<strong>low</strong>ing Half Boundaries ::::::::134<br />

5.2.2 Corner Extraction ::::::::::::::::::137<br />

5.3 Motion Transcription :::::::::::::::::::::141<br />

5.3.1 Reversing the Sense of the Motion In<strong>for</strong>mation : :141<br />

5.3.2 Interpolating the Motion Values ::::::::::141<br />

5.3.3 Mesh Connectivity ::::::::::::::::::146<br />

5.3.4 First results ::::::::::::::::::::::147<br />

5.4 Results :::::::::::::::::::::::::::::148<br />

5.5 Conclusion ::::::::::::::::::::::::::158<br />

Conclusion 161<br />

xi

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