Real-time Frame Rate Restoration by Compensating Camera Zooming and Panning
| Autor: | Lin-Ying Chuang, 莊林穎 |
|---|---|
| Rok vydání: | 2003 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 91 In this thesis, we proposed a fast frame interpolator at decoder end to enhance the temporal quality of the real-time low-bit-rate video applications, such as the cellualr video conferencing. The proposed frame interpolator operates in the fashion of block-base instead of pixel-base to achieve the real-time speed. The global motion model is adopted in our scheme to interpolate the camera motion. Our scheme fully utilizes the received block-based motion vectors from the encoder to minimize the complexity of the global motion search. Furthermore, the majority of the local motion vectors for moving object interpolation can be directly derived without performing complex local motion search at the decoder end. Some failed interpolated frames may be occurred due to insufficient information received at decoder. We detect and use bidirectional frame repetition(BFR) on those failed interpolated frames. The experiment shows that the proposed algorithm can interpolate frames in real-time and successfully remove the jigger artifacts caused by the low frame rate. Our proposed methods can be used not only in fixed-block-size H.263+ but also in variable-block-size H.264/AVC. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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