Masahiko Kitamura

Beyond 4K: 8K 60p live video streaming to multiple sites

The high definition of 4K motion pictures makes them applicable to a wide variety of purposes. The development of 4K image equipment such as cameras, displays, and playback systems has made easy viewing of 4K video possible. Video frame rates have also become higher, enabling 4K-60 fps progressive (60p) video streams to be transmitted over IP networks. However, problems remain in increasing video image resolution to 8K or more so as to build systems in which many people collaborate at the same time. This paper describes a video transmission system that attains image resolution of 8K-60p or higher by synchronizing multiple 4K transmission systems we have developed. Since 8K-60p transmission over IP networks has extremely high traffic rates, schemes for achieving robust transmission such as forward error correction (FEC) must also have very high rates. We have also developed techniques for attaining reliable transmission, i.e., the use of low-density generator matrix (LDGM) codes to achieve high throughput FEC, application-layer multicasting, and monitoring network status at multiple points.

A Study on the Correlation between QoE of 4K Super High Definition Video Streamings and QoS of Network

Realtime video streaming is one of the most impor- tant tool for the computer supported collaborative workspace (CSCW). CSCW requires bi-directional or many-directional video exchanging. The delay or jitter caused by network quality is easily affecting application or users of CSCW. The quality of experience (QoE) of CSCW with video streaming over IP networks depends on the quality of network. It is important to consider the relationship between the QoE of video streaming and quality of service (QoS) of the network in order to achieve high quality CSCW services effectively. Then we can define the suitable parameter of networks for the applications. The goal of this research is to establish the evaluation method of the correlations between the QoE of CSCWs and QoS of networks to obtain the optimal real-time communication system design. In this paper, we propose a method to measure the correlation between the application and network QoS with precise packet monitoring environment. The result shows that micro-second resolution helps a lot to capture the precise behavior which effects the codec systems performance.

Digital Cinema and Super-High-Definition Content Distribution on Optical High-Speed Networks

Digital cinema is a promising application that utilizes high-speed optical networks to transfer super-high-definition (SHD) images. The networks are primarily used for distributing digital cinema contents in packet data form, and are also used to support new services such as the live streaming of musicals and sport games to movie theaters. While current transfer services offer high-definition (HD) quality video, live-streaming applications will soon shift to providing cinema quality 4K content to both business and movie theaters users. The extra-high-quality 4K format enables a realistic telepresence, and will be combined with special tools such as video editing systems to realize effective remote collaboration for business workspaces. This paper introduces successive research on SHD image transmission and its application, especially in digital cinema and associated application fields.

Low-Density Generator Matrix Codes for IP Packet Video Streaming with Backward Compatibility

In this paper we propose a method of constructing packet-level LDGM codes that offer backward compatibility with conventional viewing devices. Our proposed method makes it possible to watch content even if the viewer does not support any FEC module. Moreover, the method also improves the coding efficiency through the combined use of packet division and interleaving methods. In general, there is a tradeoff between computation complexity and performance, but our proposed method improves coding efficiency by using a message passing decoding scheme that does not require any additional computation. The coding efficiency of the proposed method is evaluated both experimentally and theoretically.

Digital Cinema over optical network - Status of super HD development -

Digital Cinema is a promising application that utilizes high-speed optical networks to transfer super high definition images. The networks are primary used for distributing packet data of digital cinema contents, and are also used to support new services such as the live streaming of musicals and sports games to movie theaters. While current transfer services offer HD quality video, live streaming applications will soon shift to cinema quality 4K to both business and movie theaters users. The extra-high quality 4K enables a realistic tele-presence, and will be combined with special tools such as video editing systems to realize effective remote-collaboration for business workspaces. This paper introduces current research on super high definition image transmission and its application especially in digital cinema and relevant application fields.

A Basic Study on High Bandwidth Streaming in Realtime over Multipath Using LDPC-IRA Codes

This paper describes a distributed video streaming system using widely disparsed storages, in which each storage hosts send chunked video packets to single receiver through multipath network. By adding parity packets by forward error correction (FEC) along with source video data in each storage hosts, this system enables realtime video streamings even if there are unbalance between those hosts. In this paper, we introduce a model of this unbalance and its effect to the amount of needed packet sending, then discuss how to design redundancy rate in FEC. The result are shown to have a trade off among the range of balancing and the additional amount of sending packet needed for stable video streaming.

Content Espresso: A System for Large File Sharing Using Globally Dispersed Storage

Sharing files over the world with higher access throughput and with lower storage cost is a growing demand for the applications that use large files. However, the existing file sharing systems do not realize these two conflicted requests and no research has been found. This paper clarifies the requirements of a global large file sharing system and defines the design goal consisting of three users perspectives: fast retrieving, user defined file availability, and owner-based file management, and one system operators perspective: flexibility in bytes placement. Content Espresso satisfies this goal by approaching with four techniques: three sections model, distributed chunk storage, forward error correction, and UDP retrieving. Content Espresso delivers large files to a client utilizing as much bandwidth as the client access link even servers are located far away from the client.

4K & 2K multi-resolution video communication with 60 fps over IP networks using JPEG2000

In this paper, 4K & 2K multi-resolution and 60 fps progressive video transmission system is introduced. And its application to the world first bi-directional 4K and 60 fps communication experiments over IP network is discussed. This system implements JPEG 2000 multi-layer scalable coding technology and operates progressively with 60 fps. Its resolution is up to 4096 × 2160 pixels (called 4K), using layer structure concept combined with 2048 × 1080 pixels (2K) resolution. All digital video data are continuously transmitted at up to 700 Mbps over IP networks. This system opens the door to the next generation of CSCW (Computer Supported Collaborative Workspace) over broadband networks.