JPEG transCompressor and video networks
MULTIMEDIA '99 Proceedings of the seventh ACM international conference on Multimedia (Part 2)
Mediaprocessing In The Compressed Domain Paper
COMPCON '96 Proceedings of the 41st IEEE International Computer Conference
Effective algorithms for fast transcoding of AVS to H.264/AVC in the spatial domain
Multimedia Tools and Applications
Open loop transcoding using perceptually adaptive requantization of DCT coefficients
MobiMedia '06 Proceedings of the 2nd international conference on Mobile multimedia communications
A novel approach for fast codebook re-quantization
Pattern Recognition
Client-centered multimedia content adaptation
ACM Transactions on Multimedia Computing, Communications, and Applications (TOMCCAP)
Resampling and requantization of band-limited Gaussian stochastic signals with flat power spectrum
Digital Signal Processing
Motion information exploitation in H.264 frame skipping transcoding
ACIVS'07 Proceedings of the 9th international conference on Advanced concepts for intelligent vision systems
Requantization transcoding for H.264/AVC video coding
Image Communication
Requantization transcoding of H.264/AVC bitstreams for intra 4×4 prediction modes
PCM'06 Proceedings of the 7th Pacific Rim conference on Advances in Multimedia Information Processing
Fast transcoding algorithm from MPEG2 to h.264
PSIVT'06 Proceedings of the First Pacific Rim conference on Advances in Image and Video Technology
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We propose rate conversion method by re-quantization in which MPEG coded video at high bit rate is converted into the MPEG bitstream at a lower bit rate without decoding to obtain the reconstructed picture. The quantization step required for re-quantization is determined by the local and global quantization steps which are closely related to the activities in the pixel domain. The simulation results show that very similar rate distortion curves to those of transcoding have been obtained, and the difference in SNR is relatively small, about 0.4 dB at 1 Mbit/s in MPEG1 using a master bitstream at 4 Mbit/s, and 1 dB at 3 Mbit/s in MPEG2 using a master at 9 Mbit/s. Since the proposed method is very simple and requires much less hardware implementation cost than transcoding, it has a significant advantage as a rate conversion tool.