| 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. | ||
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