Ann Rohaly, Philip Corriveau, John Libert, Arthur Webster, Vittorio Baroncini, John Beerends, Jean-Louis Blin, Laura Contin, Takahiro Hamada, David Harrison, Andries Hekstra, Jeffrey Lubin, Yukihiro Nishida, Ricardo Nishihara, John Pearson, Antonio Pessoa, Neil Pickford, Alexander Schertz, Massimo Visca, Andrew Watson, Stefan Winkler
The Video Quality Experts Group (VQEG) was formed in October 1997 to address video quality issues. The group is composed of experts from various backgrounds and affiliations, including participants from several internationally recognized organizations working int he field of video quality assessment. The first task undertaken by VQEG was to provide a validation of objective video quality measurement methods leading to recommendations in both the telecommunications and radiocommunication sectors of the International Telecommunications Union. To this end, VQEG designed and executed a test program to compare subjective video quality evaluations to the predictions of a number of proposed objective measurement methods for video quality in the bit rate range of 768 kb/s to 50 Mb/s. The results of this test show that there is no objective measurement system that is currently able to replace subjective testing. Depending on the metric used for evaluation, the performance of eight or nine models was found to be statistically equivalent, leading to the conclusion that no single model outperforms the others in all cases. The greatest achievement of this first validation effort is the unique data set assembled to help future development of objective models.
A new digital coding system is presented, which makes it possible to transmit up to 4 NTSC TV programs simultaneously over a single DS3 45Mbps link including two high quality sound channels and one 64 kbps ancillary data channel. The principal bit-reduction technology employed is 2 dimensional intraframe WHT (Walsh Hadamard Transform) coding with an advanced adaptive quantization reflecting human visual perception. The hardware has been made compact like a home use VTR.
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