QoS Improvement for H.264 Video Transmission Based on Structural Similarity
| Autor: | Wei-Chieh Chan, 詹偉傑 |
|---|---|
| Rok vydání: | 2009 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 97 The packets in DiffServ domain are categorized into several levels mainly based on the levels of demands for data and service. And the DS domain manager ensures every level a proper quality of service. In this thesis, we transmit the video signals over the DiffServ domain for simulation, and set a bottleneck effect to generate a congestion network for simulating the loss of packets. At the receiver during the video decoding process, we use error concealment to conceal the errors of decoded frame. To improve the quality of video signals, the video packets are first pre-marked in the application layer, and the importance of marking is according to the non-structural similarity. The control of traffic flow is marked with colors according to the importance of the video packets, and different levels of importance are given different drop precedence in order to reduce the possibility of losing important video packets. At the receiver, we use frame copy method to conceal the errors. The performance is simulated and verified by the use of NS-2 network simulator. It shows that the quality of video transmission is improved. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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