A Robust Digital Image Watermarking Scheme Using the Wavelet-Based Fusion
ICIP '97 Proceedings of the 1997 International Conference on Image Processing (ICIP '97) 3-Volume Set-Volume 1 - Volume 1
Compressed Domain Transcoding of MPEG
ICMCS '98 Proceedings of the IEEE International Conference on Multimedia Computing and Systems
QoS Streaming Based on a Media Filtering System
ICPADS '01 Proceedings of the Eighth International Conference on Parallel and Distributed Systems
H.263 Video Transcoding for Spatial Resolution Downscaling
ITCC '02 Proceedings of the International Conference on Information Technology: Coding and Computing
Transcoder architectures for video coding
IEEE Transactions on Consumer Electronics
Requantization for transcoding of MPEG-2 intraframes
IEEE Transactions on Image Processing
A method of selecting and transcoding content for mobile web service
KES'07/WIRN'07 Proceedings of the 11th international conference, KES 2007 and XVII Italian workshop on neural networks conference on Knowledge-based intelligent information and engineering systems: Part III
Pre-service and post-transcoding schema for an adaptive PC to mobile web contents transcoding system
EC-Web'06 Proceedings of the 7th international conference on E-Commerce and Web Technologies
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Our objective is to enable a format transcoding between a heterogeneous compression format in real time mode and to enhance the compression ratio using characteristics of the compression frame. In this paper, we tried to transcode MPEG 2 digital contents having a low compression ratio into H.263 contents with a high compression ratio. After analyzing MPEG2 bit stream and H.263 bit stream of the same original video, we found that the number of intra coded macro blocks in MPEG2 data is much higher that the number of the intra coded blocks in H.263 data. In the process of P frame generation, an intra coded block is generated when a motion estimation value representing the similarity between the previous frame and the current frame does not meet a threshold. Especially the intra coded macro block has a great impact on the compression ratio. Hence we tried to minimize the number of intra coded macro blocks in transcoding the INTRA coded block into INTER coded block using the information about motion vectors surrounding the intra macro block in order to minimize the complexity of the motion estimation process. The experimental results show that the transcoding of MPEG2 into H.263 can be done in real time successfully.