Research trends in new video retrieval based on image and video semantic understanding are presented in this paper. First, recent studies related to image and video semantic analysis are introduced to understand leading-edge multimedia retrieval technologies. Several works related to visualization interfaces for multimedia retrieval are also presented. Finally, trends in state-of-the-art studies and the future outlook are described.
This paper presents a survey of research trends in broadcasting technology from production to distribution and from fundamentals to applications. It briefly reviews work being done on UHDTV, 3DTV, IPTV, hybrid broadcasting, transmission technology, audio-visual coding, image sensing devices, display devices, media accessibility, content production, metadata, and content management.
In this invited research paper, I will describe the Intelligent CG Making Technology, (ICGMT) production methodology and Intelligent Media (IM). I will begin with an explanation of the key aspects of the ICGMT and a definition of IM. Thereafter I will explain the three approaches of the ICGMT. These approaches are the reuse of animation data, the making animation from text, and the making animation from natural spoken language. Finally, I will explain current approaches of the ICGMT under development by the Nakajima laboratory.
SUPER Hi-VISION is being developed to create the ultimate two-dimensional television. A set of system parameters is the basis in the research and development of televisions. The system parameters of SUPER Hi-VISION have been determined after the various investigations from the view point of human factors in particular. It features the increased pixel count to widen the field of view, high frame rate for better motion portrayal, and wide-gamut colorimetry for better color reproduction. These system parameters have been standardized as Recommendation ITU-R BT.2020 in 2012.
At NHK Science & Technology Research Laboratories, we are conducting research and development on highly efficient and large-capacity transmission technology for next generation terrestrial broadcasting in order to achieve large-volume content services such as Super Hi-Vision. We developed a new transmission system based on conventional digital terrestrial television broadcasting, ISDB-T, and applied a combination of ultra-multilevel OFDM and dual-polarized MIMO to expand the transmission capacity. This paper describes the technologies that can expand the transmission capacity, and the methods for improving the transmission characteristics.
We have developed a high-speed reliable IP transmission system for the live streaming of video content beyond HDTV. Secure IP Terminator is a key technology that consists of high-efficiency forward error correction, low jitter IP packet control and real-time encryption. The IP terminator offers extremely stable video transmission on shared networks constructed by multi-domain research and educational networks throughout the world. We verify system performance by transmiting coded Super Hi-Vision signals from London to Tokyo.
This paper reviews the current situation of 3DTV systems and clari.es issues to be solved in human factors. Several research activities on 3DTV systems are introduced as candidates that may solve such issues. In the second chapter, various 3DTV systems are classified in terms of cues for human three-dimensional perception. The third chapter describes the human factors on the stereoscopic 3DTV system such as visual discomfort and visual fatigue. Chapter 4 describes advanced 3DTV technologies that reproduce multi-viewpoint 3D images and a 3D spatial image.
For cable TV services which have grown and expanded over the last 50 or more years, we provide a forecast of their future applications, as well as cutting-edge technology. In particular, in addition to the benefits of fundamental multi-channel broadcasting and two-way communications technologies, we outline a number of possible services such as 8K video, 3D HDTV, a free-viewpoint TV, server-client based advanced applications, and multiple device associations between STB and other devices.
We are developing a millimeter-wave mobile camera that wirelessly transmits 100 Mbps class High-definition TV (HDTV) video at low compression and with low latency. To realize an uninterrupted wireless transmission while maintaining a high transmission rate, we are investigating the application of multiple-input multiple-output (MIMO) multiplexed transmission technique and millimeter-wave band that enable the use of wide bandwidth. In this article, with the aim of enabling this camera to operate in outdoor line-of-sight (LOS) environments, we performed an evaluation of cross polarized MIMO multiplexed transmission with a horizontally/vertically polarized omni antenna using a film polarizer. As a result, we were able to suppress the transmit correlation between MIMO propagation channels to 0.45 or less, and we achieved a substantial improvement in bit error rate (BER) performance (median value reduced to about 1/30 or less). On the other hand, we have confirmed that the range within which uninterrupted wireless transmission is possible becomes smaller due to the reduction in received power in cross polarization, and we have clarified the cross polarization power ratio (XPR) suitable for LOS transmission environments.
Application-layer multicast has been considered as a promising method for streaming live media to users in P2P networks. However, the inefficient bandwidth utilization and the vulnerability to peer dynamics remain important issues. In this paper, we introduce a new approach to constructing an efficient overlay leveraging the strong features of tree and mesh methods. A core overlay is built in a fashion of multiple sub-trees, which allows each peer to receive data from other peers located in any different sub-trees. We propose a set of auxiliary connections, which connect between two nodes that do not have permanent parent/child relationship, to achieve a push-based data transmission from multiple parents without redundancy. Simulations through ns2 demonstrate that our scheme provides a good streaming quality with low end-to-end delay. Also, the proposed auxiliary links is beneficial in improving the resiliency of the overlay and utilizing the bandwidth of peers.
Spectrum sharing techniques are attractive because the frequency bands for radio systems are limited. The cognitive radio technique and Ultra Wideband (UWB) system with a Detection and Avoidance (DAA) function are strong candidates for spectrum sharing. This paper discusses the techniques for detecting emissions from primary systems and the frequency bands they occupy. The received primary signals are assumed to be the sum of the sinusoidal waves. The sinusoidal signal is detected and is iteratively subtracted from the received signal to minimize the evaluation function. The frequency, phase and amplitude of the sinusoidal signals are estimated using the evaluation function and Newton method. The miss-Detection Error Rate and False Alarm Rate are evaluated to show the effectiveness of the proposed detection technique. The performance of the proposed detection scheme is superior to the ordinary scheme using FFT.