Region-Based Coding Control Algorithms for Low Bit-Rate Video
| Autor: | Yao-Ting Cheng, 鄭耀庭 |
|---|---|
| Rok vydání: | 1999 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 87 In this thesis, coding control algorithms for very low bit rate video are proposed to regulate the output data rate and maintain the output video quality. It is suited for very low bit rate coding of "head-and-shoulders" video material typical of video teleconferencing, and video telephony. In this research, the content of the coded picture is first analyzed to find the main attributes of each macroblock. The attributes of the macroblocks are then taken into account while adjusting the quantization parameters. In other words, the quantization parameters are adjusted not only depending on the fullness of the output buffer but also on the content of the coded image. The methods are implemented on H.263 which is a video coding standard for narrow band telecommunication channels up to 64kbit/s recommended by ITU-T SG 15, to show the effectiveness. The simulation result show that the perceptual quality of the coded pictures, by using the proposed methods, is better while comparing with the traditional approach. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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