Note: Your custom schedule will not be saved unless you create a new account or login to an existing account.
| Paper: | MSP-P3.2 |
| Session: | Multimedia Communication, Networking and Security II |
| Time: | Friday, May 21, 15:30 - 17:30 |
| Presentation: |
Poster |
| Topic: |
Multimedia Signal Processing: Multimedia Communication and Networking |
| Title: |
RATE-DISTORTION OPTIMIZED DCT-DOMAIN VIDEO TRANSCODER FOR BIT-RATE REDUCTION OF MPEG VIDEOS |
| Authors: |
Wen-Nung Lie; National Chung Cheng University | | |
| | Ming-Lun Tsai; National Chung Cheng University | | |
| | Tom Lin; National Chung Cheng University | | |
| Abstract: |
In this paper, we propose a rate-distortion optimized video transcoder which converts MPEG videos into a similar form at lower bit-rates. Our transcoder design is characterized of two features: 1) transcoding is performed in DCT domain and the MV information is re-used, and 2) the rate-distortion relationship is optimized in both the frame-level rate allocation and MB-level rate control, thus leading to performances even better than the direct encoding and re-encoding methods based on the well-known TM5. In the proposed algorithm, the Lagrangian multiplier plays not only its traditional role in MB-level optimization, but also a variable to be optimized in frame-level rate allocation. These two levels of optimization process are highly linked. Experiments show that the R-D optimization is effective in getting better video quality, even the drift errors are ignored. Several speedy schemes were developed to make our transcoder design suitable for real-time video transmission over heterogeneous networks. |
| |
| Back | |