• Proceedings of the CALSEC Conference
• /
• 2001.08a
• /
• pp.379-391
• /
• 2001

In this paper, we presented function catalogs that Internet content transcoding system for heterogeneous client devices must offer, and, we proposed content transcoding framework architecture that is good in extensibility. This transcoding framework can accommodate each transcoder in efficient way using device capability and user preference information based on W3C's CC/PP and Wap forum's UAProf specification. This architecture offers advantages that can add developed transcoder dynamically in Plug-In form later.

• Journal of Digital Convergence
• /
• v.12 no.11
• /
• pp.233-239
• /
• 2014

Ultra high-resolution content, the file size is very large, therefore existing encoding techniques, it is not possible to transmit via the network. Efficient use of the network encoder HEVC corporation can be transferred. Compression requires a lot of time because it requires a distributed transcoding system. Distributed transcoding system is a distributed data store, and then encoded using a large number of nodes. The disadvantage of distributed transcoding system for distributed information is exposed or vulnerable to attack by internal managers. In this paper, when the super high definition content transcoding, distributed transcoding system does not guarantee the confidentiality of the problem to solve. We are using SNA, HEVC encoded content data encrypted using the secret distributing scheme was. Consequently, secure shared transcoding is possible, the internal administrator could prevent the attack.

• Journal of Industrial Technology
• /
• v.27 no.B
• /
• pp.185-192
• /
• 2007

Transcoding video proxy is necessary to support various bandwidth requirements for mobile multimedia and to provide adapting video streams to mobile clients. Caching algorithms for proxy are to reduce the network traffic between the content servers and the proxy. This paper proposes a Meta-tailed caching for transcoding proxy that is efficient to lower network load and CPU load. Caching of two different data types - transcoded video, and metadata - provides a foundation to achieve superior balance between network resource and computation resource at transcoding proxies. Experimental results show that the Meta-tailed caching lowers at least 10% of CPU-load and at least 9% of network-load at a transcoding proxy.

• Journal of KIISE:Software and Applications
• /
• v.31 no.7
• /
• pp.901-910
• /
• 2004

In this paper, we propose a content-based MPEG transcoding method using a discontinuity feature in the Discrete Cosine Transform (DCT) domain. A DCT block is transcoded differently depending on the height of dominant discontinuity within a block. In the experiment, we show the result that the video quality of content-based transcoding is better than that of a constant cut-off method and the processing time of the adaptive method is much faster compared with the pixel domain methods in the same bandwidth.

• KIPS Transactions on Computer and Communication Systems
• /
• v.3 no.7
• /
• pp.231-240
• /
• 2014

Video transcoding techniques provide an efficient mechanism to make a video content adaptive to the capabilities of a variety of clients. However, it is hard to provide an appropriate quality-of-service(QoS) to the clients owing to heavy workload on transcoding operations. In light of this fact, this paper presents the dual transcoding method in order to guarantee QoS in streaming services by maximizing resource usage in a transcoding server equipped with both CPU and GPU computing units. The CPU and GPU computing units have different architectural features. The proposed method speculates workload of incoming transcoding requests and then schedules the requests either to the CPU or GPU accordingly. From performance evaluation, the proposed dual transcoding method achieved a speedup of 1.84 compared with traditional transcoding approach.

• The KIPS Transactions:PartD
• /
• v.9D no.6
• /
• pp.1145-1156
• /
• 2002

We propose a web document transcoding technique that translates existing web pages designed for desktop computers into an appropriate form for hand-held devices connected to the wireless internet. By defining a content block based on a visual separation and using it as a minimum unit for analyzing and converting processes, we can get web pages converted more exactly. We also apply the reallocation of the content block and the generation of new index in order to provide convenient interface without left-right scrolling in small screen devices. These methods, compared with existing ways such as text level summary or partial extraction method, can provide efficient navigation and a full recognition of web documents. To gain those transcoding benefits, we propose the Layout-Forming Tag Analysis Algorithm that analyzes structural tags, which motivate visual separation and the Component Grouping Algorithm that extracts the content block. We also classify and rearrange the content block and generate the new index to produce an appropriate form of web pages for small display devices. We have designed and implemented our transcoding system in a proxy server and evaluated the methods and the algorithms through an analysis of transcoded results. Our transcoding system showed a good result on most of popular web pages that have complicated structures.

• Proceedings of the IEEK Conference
• /
• 2003.11b
• /
• pp.31-34
• /
• 2003

In this paper, we propose an application of data hiding, especially for content adaptation, where one can reduce computational time and get better transcoding results or qualify. Hiding some useful information for content adaptation can help resource tailor to do effective transcoding so that one can achieve lower complexity as well as better quality in content adaptation. Experimental results show that the proposed method based on data hiding gives effectiveness to content adaptation with reasonable subjective quality.

• The KIPS Transactions:PartD
• /
• v.14D no.7
• /
• pp.783-790
• /
• 2007

One of the particulars to be considered for providing wireless web service with PC web page is the hardware environment between PC and mobile device. It is because time cost is required in producing mobile contents to suit environment of the connected terminal. Therefore, server side should take account of response time and disk capacity of server. Response time is delayed by content conversion and disk capacity need to store various versions about one content. This paper suggests a pre-service and post-transcoding method to provide faster response time for a mobile terminal. The pre-service is to minimize response time by placing the top priority in servicing contents saved in cache as much as possible even if the quality of contents serviced to mobile terminal may be low. After pre-service is provided, the mobile content is transcoded for the terminal later. Performance level of method proposed was compared through experiment and the result of analysis was described.

• Journal of the Korea Convergence Society
• /
• v.9 no.6
• /
• pp.17-23
• /
• 2018

In this paper, content management system (CMS) is introduced to serve IPTV, WEB, Mobile, Smart Devices and others using a single content management system's transcoding engine to overcome the limitations of traditional content management systems. Developed CMS reduced the burden of content management by automatically recognizing one content into several content simultaneously to provide the best content to each device, thereby reducing the burden of CMS additional adoption. The focus is on utilizing automated system for studio content and automatic management of mobile filmed images, and it is planned to develop the One-Stop Service for contents by adding functions for contents production later.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2003.10a
• /
• pp.105-108
• /
• 2003

In the framework of universal multimedia access, one challenge for video transmission (communication) is to deliver video content through heterogeneous network channels matching the diversity of client devices. As one of the many adaptation methods, media transcoding is commonly considered. Particularly, FD (Frame Dropping)/CD Coefficient Dropping) transcoding is used due to the low computational complexity and simple implementation. In this scheme, CD is simply implemented by truncating the high frequency AC DCT coefficient bits. But, the CD error tends to be propagated within single GOV. In this paper, we derive the distortion relationships between CD error and propagation error, and investigate the error characteristics by computer simulations. The CD error characteristics can be effectively used in the FD/CD transcoding scheme.