Uncompressed Video Transmission Research Articles

Low-Noise Graded-Index Plastic Optical Fiber Achieved by Specific Copolymerization Process

Ultra-high-definition (UHD) technologies have recently received attention on account of their practical applications in consumer electronics. UHD devices require uncompressed video transmission at a data rate exceeding 100 Gb/s; thus, an optical fiber connection is essential. In consumer applications, optical fibers are very short. Moreover, their connections must permit variations in the fiber alignment, which accommodates rough handling by consumers. Under this condition, the transmitted signal quality is significantly degraded owing to noise and instabilities that strongly depend on the fiber alignment conditions in optical modules and connectors. Therefore, graded-index plastic optical fibers (GI POFs) are promising optical cables for consumer applications because of their flexibility, safety, and high bandwidth. Recently, the authors experimentally demonstrated that GI POFs can reduce interferometric noise, such as modal noise and multipath interference noise, in a multimode fiber link based on a vertical-cavity surface-emitting laser (VCSEL). This noise reduction effect results from strong mode coupling of GI POFs, which is closely related to microscopic heterogeneous structures of a core polymer matrix. In this paper, a control method of mode coupling using the copolymerization process for fiber core materials is proposed. The formation of composition fluctuations by copolymerization increases the mode coupling in the GI POF core. It thereby enables highly stable and robust data transmission with a large fiber misalignment tolerance in a VCSEL-based multimode fiber link. The proposed method for mode coupling control is expected to contribute to household optical communication systems in the upcoming UHD era.

Real-Time Uncompressed Video Transmission Over Wireless Channels Using Unequal Power Allocation

Uncompressed video transmission has recently attracted research attentions since it ensures ultra-low latency, high video quality, and low complexity. In this paper, we propose a real-time uncompressed video transmission system, where unequal power allocation (UPA) strategies are adopted to maximize the peak signal-to-noise ratio (PSNR) while considering the peak-to-average power ratio (PAPR) reduction. Specifically, the relationship between the bit error rate (BER) and the mean square error (MSE) of this system is established. Based on the relationship, a group of optimization problems are formulated and UPA schemes are proposed through solving these problems. Among all strategies, UPA with an adaptive Hadamard switch is finally adopted in the proposed system, because it outperforms other schemes in PSNR performance under both the total power constraint and the PAPR constraint. Simulation results show that the PSNR of the reconstructed video is improved largely compared with reference methods.

Joint Carrier Matching and Power Allocation for Wireless Video with General Distortion Measure

In this paper, we present a cross-layer design for a family of OFDM-based video communications by jointly considering application layer information and the wireless channel conditions. Compared with traditional cross-layer designs, our proposed method targets to efficiently transmit video data generated with some emerging techniques for better wireless transmissions, where the video data are divided into multiple chunks and each chunk contributes independent distortion to the entire video quality. To minimize the end-to-end distortion, we formulate a generalized optimization problem and derive a joint optimal carrier matching and power allocation scheme. Rather than depending on a specific video encoding method as done in the conventional work, we intend our design to be applicable to a general family of new video schemes. We apply our proposed method to two applications, the enhanced analog coding and the uncompressed video transmission over OFDM. In both applications, the performance can be improved by adopting our scheme. Simulation results validate the effectiveness of our approach in achieving significantly better PSNR and visual quality compared to reference schemes.

An Adaptive Modulation Technique for Wireless Image Sequence Transmission

Compressed video transmissions can maximize frequency efficiency. However, with regard to image identification, the performance of compressed video transmission is not guaranteed when compared to uncompressed video transmissions. In uncompressed video transmissions, the video-codec can be removed from the devices, which can then solve problems for real-time image transmission and significantly reduce power consumption. In this paper, an effective transmission of uncompressed video is proposed for multi-antennas. When a transmitter sends video data through multiple antennas, an adaptive modulation technique is utilized for enhancing the video quality. The proposed technique adaptively selects a modulation scheme optimized depending on the channel environments. In the proposed scheme, the most significant bit group is transmitted via a selected antenna with good channel environment. From the simulation results, it was found that the peak signal to noise ratio performance of the proposed algorithm improved by about $$3.0\,{\sim }\,4.0\,\hbox {dB}$$3.0~4.0dB in comparison to other conventional algorithms.

An Image Sequence Transmission Method in Wireless Video Surveillance Systems

Under unpredictable wireless communication environments such as a battlefield, uncompressed video data is easy to restore and more effective to decipher than compressed video data when there are lots of errors in the received data. This paper proposes a wireless uncompressed video transmission system to ensure image quality even under a low signal to noise ratio (SNR). It utilizes a method of transmitting data asymmetrically on the basis of the image information in the wireless communication system using multiple antennas. The proposed algorithm is applied to the IEEE 802.11ac system and can improve about 5dB in terms of the peak signal to noise ratio under the SNR environment of 10 dB or less compared to an existing algorithm. From the simulation results, the proposed method is very suitable for wireless video surveillance systems that should provide video streams with a certain level of quality even under severe conditions.

Adaptive multiple description coding and transmission of uncompressed video over 60GHz networks

While many cognitive radio (CR) techniques are developed to better utilize the allocated spectrum, the massive unlicensed bandwidth in the 60GHz band also provides great potential for supporting new bandwidth intensive applications. In this paper, we investigate the problem of streaming uncompressed High Definitio (HD) videos over 60GHz networks. We present an adaptive multiple description (MD) coding (MDC) technique based on Priority Encoding Transmission (PET) that exploits the different significanc of the pixel bits, and an interleaving based transmission scheme to combat the bursty losses due to blockage. A nonlinear integer programming problem is formulated and solved with a heuristic approach for determining the sub-optimal coding and transmission parameters. The proposed scheme is adaptive to the dynamic 60GHz link conditions for enhanced video quality. The performance of the proposed scheme is validated with simulations.

Iterative source and channel decoding relying on correlation modelling for wireless video transmission

Since joint source-channel decoding (JSCD) is capable of exploiting the residual redundancy in the source signals for improving the attainable error resilience, it has attracted substantial attention. Motivated by the principle of exploiting the source redundancy at the receiver, in this treatise we study the application of iterative source channel decoding (ISCD) aided video communications, where the video signal is modelled by a first-order Markov process. Firstly, we derive reduced-complexity formulas for the first-order Markov modelling (FOMM) aided source decoding. Then we propose a bit-based iterative horizontal vertical scanline model (IHVSM) aided source decoding algorithm, where a horizontal and a vertical source decoder are employed for exchanging their extrinsic information using the iterative decoding philosophy. The iterative IHVSM aided decoder is then employed in a forward error correction (FEC) encoded uncompressed video transmission scenario, where the IHVSM and the FEC decoder exchange softbit-information for performing turbo-like ISCD for the sake of improving the reconstructed video quality. Finally, we benchmark the attainable system performance against a near-lossless H.264/AVC video communication system and the existing FOMM based softbit source decoding scheme, where The financial support of the RC-UK under the auspices of the India-UK Advanced Technology Centre (IU-ATC) and that of the EU under the CONCERTO project as well as that of the European Research Council’s Advanced Fellow Grant is gratefully acknowledged. The softbit decoding is performed by a one-dimensional Markov model aided decoder. Our simulation results show that Eb=N0 improvements in excess of 2.8 dB are attainable by the proposed technique in uncompressed video applications.

Spatio-Temporal Iterative Source–Channel Decoding Aided Video Transmission

Low-complexity uncompressed video transmission meets the requirements of home networking and quality/delay-sensitive medical applications. Hence, it has attracted research attention in recent years. The redundancy inherent in the uncompressed video signals may be exploited by joint source–channel decoding to improve the attainable error resilience. Hence, in this treatise, we study the application of iterative joint source–channel decoding aided uncompressed video transmission, where correlation inherent in the video signals is modeled by a first-order Markov process. First, we propose a spatiotemporal joint source–channel decoding system using a recursive systematic convolutional codec, where both the horizontal and vertical intraframe correlations, as well as the interframe correlations, are exploited by the receiver, hence relying on 3-D information exchange. This scheme may be combined with arbitrary channel codecs. Then, we analyze the three-stage decoder's convergence behavior using 3-D extrinsic information transfer (EXIT) charts. Finally, we benchmark the attainable system performance against a couple of video communication systems, including our previously proposed 2-D scheme, where only intraframe correlations were exploited without invoking a channel codec. Our simulation results show that substantial $E_{b}/N_{0}$ improvements are attainable by the proposed technique.

무선랜 환경에서 보안을 고려한 효율적 전송성능 향상에 관한 연구

Recently, new technologies based on wireless LAN is being studied because utilization on smart phone using Wi-Fi is increased. 802.11 b/g/a is universalized wireless LAN technologies based on ISM, the standard developed in 11`s working group of IEEE 802. standardization about IEEE 802.11ac that overcame limitation on Blue-ray of IEEE 802.11n or uncompressed video transmission and IEEE 802.af`s technologies using TVWS is being actively studied. In this paper, ability of transmission considering the security on AP operated by these technologies have measured and done a comparative analysis with existing wireless LAN environment ability of transmission measured when appling security is more stable than existing ability of transmission in an environment with obstacles and shorten of transmission time is confirmed as a result of analysis.

4-Gbps Uncompressed Video Transmission over a 60-GHz Orbital Angular Momentum Wireless Channel

We demonstrate successful transmission of 4-Gbps uncompressed video over a 60-GHz orbital angular momentum (OAM) wireless channel. Matlab simulation was employed to support the experimental work and to generate the holographic masks used. Matlab coding is a unique approach which can produce any desired shape on copper or dielectric plates by mean of a commercial routing tool. We believe this is the first reported transmission of 4-Gbps uncompressed video over the 60-GHz OAM wireless channel. Good agreement was achieved between the simulated and measured results. Practical opportunities for multi-gigabit future wireless communications are available.

Demonstration and Comparison Study for V- and W-Band Real-Time High-Definition Video Delivery in Diverse Fiber-Wireless Infrastructure

This article experimentally demonstrates uncompressed high-definition video distribution in V-band (50–75 GHz) and W-band (75–110 GHz) fiber-wireless links achieving 3 m of wireless transmission in both cases. Access architecture is experimentally emulated by deploying single/multi-mode fibers. For the W-band, experimental assessment of passive and active approaches for implementation of remote antenna units is reported. The bit error rate performance of the optical and wireless channels is reported. A successful transmission of real-time uncompressed high-definition video in the V- and W-band fiber-wireless systems is demonstrated with prospects to pave the way for application-focused fiber-wireless connectivity.

Teleteaching endoscopy: the feasibility of real-time, uncompressed video transmission by using advanced-network technologies

Teleteaching of endoscopy has been limited by the exorbitant cost and time inherent in high-quality digital endoscopy video transmission. The Digital Video Transport System (DVTS) transmitted over advanced networks, such as Internet2 and the Asia-Pacific Advanced Network (APAN), provides a unique infrastructure for sharing uncompressed digital videos of endoscopy. This may allow high-quality, real-time, international training of diagnostic and therapeutic endoscopy techniques at a low cost. To test the proof of concept of long-distance teaching through live, interactive, high-resolution video transmission by using advanced networks and the DVTS. We used teleteaching of image-enhanced endoscopy techniques as a model. Prospective multicenter pilot study. Trainees, faculty, and staff at 3 international endoscopy units. An image-enhanced endoscopy video lecture with advanced-network technologies. We compared image-based prelecture and postlecture test scores and secondarily assessed technical feasibility and quality. The DVTS transmitted over advanced networks successfully transmitted uncompressed, high-resolution, digital lectures with endoscopic video (digital video format 720 x 480 pixels). Postsession scores improved. Participants highly rated the technical and informational quality. The majority reported a definite interest in participating in future sessions, with a mean rating (out of 5 [scale 1-5]) of 4.7 +/- 0.5. Pilot study with a limited number of participants and sessions. The DVTS transmitted over advanced networks such as Internet2 and APAN can provide the infrastructure for transmission of high-resolution, uncompressed video endoscopy for the purpose of teleteaching endoscopy.

Uncompressed Video Image Transmission of Laparoscopic or Endoscopic Surgery for Telemedicine

Traditional narrowband telemedicine cannot provide quality dynamic images. We conducted videoconferences of laparoscopic and endoscopic operations via an uncompressed video transmission technique. A superfast broadband Internet link was set up between Shanghai in the People's Republic of China and Fukuoka in Japan. Uncompressed dynamic video images of laparoscopic and endoscopic operations were transmitted by a digital video transfer system (DVTS). Seven teleconferences were conducted between June 2005 and June 2007. Of the 7 teleconferences, 5 were live surgical demonstrations and 3 were recorded video teleconsultations. Smoothness of the motion picture, sharpness of images, and clarity of sound were benefited by this form of telemedicine based upon DVTS. Telemedicine based upon DVTS is a superior choice for laparoscopic and endoscopic skill training across the borders.

Transmission and multiplexing of uncompressed video and ancillary signals over a new multimedia frame

This work discusses the design and implementation of a fibre based, low cost communication system for transmission of uncompressed digitised 10 bit video and ancillary signals. The paper details a newly devised multiplexing scheme with a special frame format. The frame developed allows expandability for the multichannel transmission of audio-video signals multiplexed with other types of data. The system can be easily reconfigured to operate with different video and audio sampling frequencies so as to produce serial bit rates suitable for various applications. Test results show the efficacy of the transfer mechanism developed for the multiplexing and transmission of high quality signals.