The Experts below are selected from a list of 24516 Experts worldwide ranked by ideXlab platform
R.m. Hodgson - One of the best experts on this subject based on the ideXlab platform.
-
the development of a synthetic colour test image for subjective and objective quality assessment of digital codecs
Asia-Pacific Conference on Communications, 2005Co-Authors: G A D Punchihewa, Donald G Bailey, R.m. HodgsonAbstract:Subjective and objective quality measures are required for monitoring image and video systems. Our aim is to develop a static colour test image for digital codec and video system evaluation that is analogous to the colour bar signal commonly used in analogue Television Broadcasting. This approach is capable of highlighting coding colour artefacts, and enables both subjective and objective evaluation. The effectiveness of the developed test image is demonstrated using a JPEG codec. Three objective quality metrics are proposed of which two have been linked to the conventional vectorscope used in analogue Television systems
-
the development of a novel image quality metric and a synthetic colour test image for objective quality assessment of digital codecs
IEEE Region 10 Conference, 2005Co-Authors: Amal Punchihewa, D G Baile, R.m. HodgsonAbstract:This paper proposes a novel image quality metric for colour codecs and a novel colour test image. The degree of colour error (bleeding) due to image compression is evaluated with a special colour test image designed to emphasise colour artefacts. The known reference approach, which is used in this research, offers swift and accurate measurements. The proposed test image replaces the full field static colour bar test signal used in analogue Television and video engineering. The proposed test image can be used to evaluate the performance of digital video and Television Broadcasting facilities. The objective quality measure can also be used in the codec development process and in benchmarking codec performance. The efficacy of the new metric and test image is assessed using a JPEG codec at a range of compression levels.
G A D Punchihewa - One of the best experts on this subject based on the ideXlab platform.
-
the development of a synthetic colour test image for subjective and objective quality assessment of digital codecs
Asia-Pacific Conference on Communications, 2005Co-Authors: G A D Punchihewa, Donald G Bailey, R.m. HodgsonAbstract:Subjective and objective quality measures are required for monitoring image and video systems. Our aim is to develop a static colour test image for digital codec and video system evaluation that is analogous to the colour bar signal commonly used in analogue Television Broadcasting. This approach is capable of highlighting coding colour artefacts, and enables both subjective and objective evaluation. The effectiveness of the developed test image is demonstrated using a JPEG codec. Three objective quality metrics are proposed of which two have been linked to the conventional vectorscope used in analogue Television systems
Jian Song - One of the best experts on this subject based on the ideXlab platform.
-
digital terrestrial Television Broadcasting technology and system
2015Co-Authors: Jian Song, Zhixing Yang, Jun WangAbstract:This book covers channel coding and modulation technologies in DTTB systems from the general concepts to the detailed analysis and implementation. * Covers the Chinese DTTB standard which was announced recently and hasn t been covered in detail * Introduces the SFN network using the successful implementation of DTMB in Hong Kong as an example * Introduces the latest announced systems including the ATSC M/H and DVB-NGH
-
inter carrier interference cancelation for alamouti coded single frequency network
International Symposium on Broadband Multimedia Systems and Broadcasting, 2015Co-Authors: Jing Wang, Jintao Wang, Su Huang, Jian SongAbstract:For digital terrestrial Television Broadcasting (DT-TB) systems, orthogonal frequency division multiplexing (OFDM) technique is considered to be an effective method to combat the frequency selective channel cause by multi-path effect. In the single frequency network (SFN) scenario, Alamouti space frequency block coding (SFBC) is introduced to provide spatial diversity gain and improve the link stability. However, both OFDM and Alamouti SFBC are sensitive to time-variant during mobile reception. In this paper, we propose a decision feedback equalization algorithm for inter-carrier interference (ICI) can-celation of the dual (PN) padded time domain synchronization OFDM (TDS-OFDM) DTTB system over doubly selective channel. Our algorithm is proven by numerical simulations which show bit error rate (BER) gain over mobile SFN channel and can be adopted in mobile high density Television (HDTV) transmission systems.
-
joint channel and doppler shift estimation in tds ofdm using frequency sensitive set
International Symposium on Broadband Multimedia Systems and Broadcasting, 2014Co-Authors: Jinxing Hao, Jintao Wang, Jian SongAbstract:Time-varying channel always plays great obstacle to OFDM (orthogonal frequency domain modulation) as it introduces intercarrier interference (ICI). In terrestrial digital Television Broadcasting systems, residual Doppler shift may exist and deteriorate the orthogonality of subcarrier signal, especially during high-speed transportation such as high-speed railways. This paper proposed a jointly Doppler and channel estimation method originated from conventional sparse channel estimation in time-domain synchronized OFDM (TDS-OFDM) scheme, which shows a promising technique to further combat ICI without compromising on spectral efficiency.
-
a transmit diversity scheme for tds ofdm system
IEEE Transactions on Broadcasting, 2008Co-Authors: Jintao Wang, Ke Gong, Jian SongAbstract:Transmit diversity is especially important in Broadcasting network. In this paper, a transmit diversity method is proposed for the Chinese National Digital terrestrial Television Broadcasting (DTTB) standard. The transmit diversity scheme is based on the design of orthogonal sequences which have perfect crosscorrelation and almost perfect autocorrelation characteristic. The characteristics of the proposed sequences can help for synchronization and channel estimation in time domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) system. Simulations using space-time codes (STCs) in digital terrestrial/Television multimedia Broadcasting (DTMB) system with low density parity check coding (LDPC) show that the proposed transmit diversity method has about 1-2 dB signal-to-noise ratio (SNR) gain comparing with no diversity for QPSK and 16 QAM constellations at BER= 10-4, and it can avoid the appearance of BER floor for 64 QAM constellation.
-
technical review on chinese digital terrestrial Television Broadcasting standard and measurements on some working modes
IEEE Transactions on Broadcasting, 2007Co-Authors: Jian Song, Lin Yang, Ke Gong, Zhixing Yang, Changyong Pan, Jun Wang, Y WuAbstract:Technical details of the recently announced Chinese Digital Terrestrial Television Broadcasting Standard which defines the physical layer transmission protocol including the frame structure, channel coding and modulation schemes are discussed in this paper. The major differences between Chinese DTV standard in multi-carrier working mode and DVB-T standard, all occupying the same 8 MHz baseband bandwidth, are addressed. The measurement results of several working modes showing satisfactory receiving performance of high and standard definition TV signals under both indoor and outdoor environments for the fixed and mobile reception are also presented
Donald G Bailey - One of the best experts on this subject based on the ideXlab platform.
-
the development of a synthetic colour test image for subjective and objective quality assessment of digital codecs
Asia-Pacific Conference on Communications, 2005Co-Authors: G A D Punchihewa, Donald G Bailey, R.m. HodgsonAbstract:Subjective and objective quality measures are required for monitoring image and video systems. Our aim is to develop a static colour test image for digital codec and video system evaluation that is analogous to the colour bar signal commonly used in analogue Television Broadcasting. This approach is capable of highlighting coding colour artefacts, and enables both subjective and objective evaluation. The effectiveness of the developed test image is demonstrated using a JPEG codec. Three objective quality metrics are proposed of which two have been linked to the conventional vectorscope used in analogue Television systems
K Shibuya - One of the best experts on this subject based on the ideXlab platform.
-
broadcast wave relay technology for digital terrestrial Television Broadcasting
Proceedings of the IEEE, 2006Co-Authors: K ShibuyaAbstract:Digital Terrestrial Broadcasting (DTB) services were started in three major Japanese urban areas-Tokyo, Osaka, and Nagoya-in December 2003. These services will eventually be made available throughout the entire country before the termination of analog Television Broadcasting services scheduled in 2011. A large number of relay broadcast stations are required to deliver DTB signals throughout the country, and reducing the cost of these facilities is a matter of considerable importance. Signals can be delivered to relay stations by dedicated lines such as studio-to-transmitter link/transmitter-to-transmitter link (STL/TTL) or by performing relay broadcasts. Relaying is especially important because it does not require new frequency resources and keeps the facility costs low. However, since a relay receives, amplifies, and retransmits the broadcast signals from the upper station, there are various factors that cause the quality of the propagated signal to deteriorate. At NHK Science and Technical Research Laboratories (STRL), we are researching and developing techniques that will alleviate these adverse effects. This paper presents an overview of these techniques and introduces the results of field trials of prototype equipment.
