检索结果-内蒙古大学图书馆

Conference on VLSI Circuits and Systems

作者： Kalva, H Vetro, A Sun, HF Mitsubishi Elect Res Labs Murray Hill NJ USA

ISBN: (纸本)0819449776

The MPEG-2 compressed digital video content is being used in a number of products including the DVDs, camcorders, digital TV, and HDTV. The ability to access this widely available MPEG-2 content on low-power end-user devices such as PDAs and mobile phones depends on effective techniques for transcoding the MPEG-2 content to a more appropriate, low bitrate, video format such as MPEG-4. In this paper we present the software and algorithmic optimizations performed in developing a real time MPEG-2 to MPEG-4 video transcoder. A brief overview of the transcoding architectures is also provided. The transcoder was targeted and optimized for Windows PCs with the Intel Pentium-4 processors. The optimizations performed exploit the SIMD parallelism offered by the Intel's Pentium-class processors with MMX support. The transcoder consists of two distinct components: the MPEG-2 video decoder and the MPEG-4 video transcoder. The MPEG-2 video decoder is based on the MPEG-2 Software Simulation Group's reference implementation while MPEG-4 transcoder is developed from scratch with portions taken from the MOMUSYS implementation of the MPEG-4 video encoder. The optimizations include: 1) generic block-processing optimizations that affected both the MPEG-2 decoder and the MPEG-4 transcoder and 2) optimizations specific to the MPEG-2 video decoder and the MPEG-4 video transcoder. The optimizations resulted in significant improvements both in MPEG-2 decoding as well as the MPEG-4 transcoding. With optimizations, the total time spent by the transcoder was reduced by over 82% with MPEG-2 decoding reduced by over 56% and MPEG-4 transcoding reduced. by over 86%.

关键词： MPEG-2 MPEG-4 transcoder optimization Intel CPU MMX Intel C plus plus compiler

来源：评论

学校读者我要写书评

暂无评论

TC-GXML A transcoder for HTML to XML Grammar

TC-GXML A Transcoder for HTML to XML Grammar

引用

International Conference on Data Storage and Data Engineering (DSDE)

作者： Singh, Raghuraj Verma, Prabhat Singh, Avinash Kumar Harcourt Butler Technol Inst Dept Comp Sci & Engn Kanpur 208002 Uttar Pradesh India

ISBN: (纸本)9780769539584

This paper discusses a transcoder, TC-GXML, designed and developed by us as a part of an ongoing research project related to design and development of a speech based web-browsing system for visually challenged. It is always easier to develop a visual application than a non-visual application based on speech interface. There are issues like Non-Standard format of HTML, due to which it is difficult for a developer to design a common non-visual interface. In the design of TC-GXML, we have considered all these issue in transforming HTML to GXML and then to VoiceXML or any other XML type. TC-GXML is an improvement over existing Transcoding techniques in terms of its capability of parsing a wider range of websites of varied structure.

关键词： transcoder HTML to VoiceXML HTML to Grammar XML GXML VoiceXML

来源：评论

学校读者我要写书评

暂无评论

MAPPING MOTION VECTORS FOR A WYNER-ZIV VIDEO transcoder

MAPPING MOTION VECTORS FOR A WYNER-ZIV VIDEO TRANSCODER

引用

16th IEEE International Conference on Image Processing

作者： Peixoto, Eduardo de Queiroz, Ricardo L. Mukherjee, Debargha Univ Brasilia Brasilia DF Brazil Hewlett Packard Labs Palo Alto CA USA

ISBN: (纸本)9781424456536

Wyner-Ziv (WZ) coding of video utilizes simple encoders and highly complex decoders. A transcoder from a WZ codec to a traditional codec can potentially increase the range of applications for WZ codecs. We present a transcoder scheme from the most popular WZ codec architecture to a DPCM/DCT codec. As a proof of concept, we implemented this transcoder using a simple pixel domain WZ codec and the standard H.263+. The transcoder design aims at reducing complexity, since the transcoder has to perform both WZ decoding and DPCM/DCT encoding, including motion estimation. New approaches are used to map motion vectors for such a transcoder. Results are presented to demonstrate the transcoder performance.

关键词： Wyner-Ziv coding transcoder H.263+ distributed video coding

来源：评论

学校读者我要写书评

暂无评论

A framework of a transcoder controlling scheme over multicast networks

A framework of a transcoder controlling scheme over multicas...

引用

11th Asia-Pacific Conference on Communications

作者： Shudo, Y Takahashi, T Asatani, K Tominaga, H Waseda Univ Grad Sch Global Informat & Telecommun Studies Tokyo Japan

ISBN: (纸本)0780391322

Recently, video transmission services over networks are getting very popular thanks to the development of network infrastructure. From the viewpoint of efficient network bandwidth utilization, multicast is a key technology that provides high Qos services. However, it is very difficult to obtain high Qos for each individual user since the requirement and environment of each user is so different due to the heterogeneity of current network and terminals. Hence we propose a transcoder controlling scheme that enable each user to obtain high Qos by utilizing transcoders. We assume that transcoder functionality will be installed over routers in the future next generation network, and hence, our proposed scheme is based on the network. The proposed scheme manipulates multicast trees and transcoders in the network. Moreover, the proposed scheme minimizes the deterioration of video streams caused by transcoding procedures by limiting the number of transcoding. Even more, the proposed scheme does not cause any extra delay by manipulating multicast tree. Finally simulation experiments evalute the proposed scheme from the viewpoint of network bandwidth consumption and clarify the efficiency and the effectiveness of the proposed scheme.

关键词： multicast transcoder PIM-SM SSM

来源：评论

学校读者我要写书评

暂无评论

A logarithmic transcoder

引用

IEEE Transactions on Computers 1972年第11期C-21卷 1165-1168页

作者： Degryse, Daniel Guerin, Bernard Communication Laboratoire de la Communication parlee et de l'Instrumentation de mesures Ecole Nationale Supérieure d'Electronique et de Radioélectricité Grenoble France

A transcoder of logarithmic digital information into linear digital information is described. The circuit is simple and accurate. It can be easily integrated and used in any digital-to-analog or analog-to-digital converter with a logarithmic response. Analog-to-digital converter, coding for transmission, implantation of a logarithmic transcoder, numeric coding with logarithmic characteristics, signal processing, transcoder. Copyright © 1972 by The Institute of Electrical and Electronics Engineers, Inc.

关键词： Analog To Digital Converter Coding For Transmission Implantation Of A Logarithmic transcoder Numeric Coding With Logarithmic Characteristics Signal Processing transcoder

来源：评论

学校读者我要写书评

暂无评论

Att :: Dsp :: Ap88-07 - Implementation of Adpcm transcoder with the We Dsp16 Dsp - 1988

引用

2016年

Att :: Dsp :: Ap88-07 - Implementation of Adpcm transcoder with the We Dsp16 Dsp - 1988 by published by

关键词： adaptive quantizer adpcm adpcm encoder adpcm transcoder ap88-07 difsx dsp16 goto implementation int int int int oxc oxc int pcm quantizer ram location set sign bit signal speed control transcoder transition detector

来源：评论

学校读者我要写书评

暂无评论

Remultiplexing scheme for MPEG-2 multiprogram transport stream transcoder

引用

ELECTRONICS AND COMMUNICATIONS IN JAPAN PART I-COMMUNICATIONS 2003年第2期86卷 1-13页

作者： Takahashi, T Hanamura, T Kasai, H Nagayoshi, I Tominaga, H Tominaga Lab Tokyo 1698555 Japan Media Glue Corp Tokyo 1690072 Japan GITI Waseda Univ Tokyo 1690051 Japan

In this paper, we propose an output packet remultiplexing scheme for an MPEG-2 multiprogram transport stream transcoder. The proposed scheme avoids STD buffer failure by dividing the packets into Program Specific Information (PSI), audio, and video and implementing remultiplexing. Specifically, PSI packets are multiplexed at a constant time interval, audio packets are multiplexed at the same times as the input times of the audio TS packets, and video packets are multiplexed so that the outputs of the video TS packets are at equal intervals. Finally, we clearly demonstrate through simulation experiments the ability to prevent STD buffer failure and the effectiveness of the proposed scheme. (C) 2002 Wiley Periodicals, Inc.

关键词： multiprogram transcoder transport stream MPEG-2 multiplexing

来源：评论

学校读者我要写书评

暂无评论

MPEG-2 to AVS-M transcoder with Mode Decision Optimization for Mobile Video Communication

MPEG-2 to AVS-M Transcoder with Mode Decision Optimization f...

引用

2nd International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM 2006), vol.4

作者： Zhen Han Ruimin Hu Li Zhu Qiong Liu The Key Laboratory of Multimedia and Network Communications Engineering Wuhan University Wuhan China The School of Computer

AVS-M (The Advanced Audio Video Coding Standard-Mobile Version) is established by Audio Video standard Working Group of China for mobile-multimedia applications. To meet demands for communication between multimedia source and mobile system, transcoding from MPEG-2 to AVS-M is a key technique. However, the advanced intra and inter mode decision techniques adopted in AVS-M have a high computing requirement, which limits the real time implementation in mobile environment In this paper, we propose a prediction mode decision optimization algorithm to reduce the transcoding complexity based on our previous work. Analyzing the relation among the prediction errors of blocks and doing adaptive motion re-estiamtion, we fast decide the best inter mode. Utilizing the directional feature of DCT coefficients, we fast decide the best intra mode. The simulation results show that the proposed MPEG-2 to AVS-M transcoder with mode decision optimization can be effectively adopted for mobile video communications.

关键词： transcoder MPEG-2 AVS-M Mode decision Mobile video communication

来源：评论

学校读者我要写书评

暂无评论

Adaptive rate control on wireless transcoder

引用

Chinese Journal of Systems Engineering and Electronics 2007年第3期000卷

作者： Chen Xudong Zhu Qingxin Liao Yong Fu Qingyun Xiong Guangze School of Computer Science and Engineering Univ.of Electronic Science and TechnologyChengdu 610054P.R.China

To guarantee the real-time transmission of a video stream,based on the stochastic optimal control method,a frame layer adaptive rate control algorithm for the wireless transcoder is proposed,which is capable of dynamically determining the transcoder's objective bit rate,according to the bandwidth variation of the wireless channel and the bufier occupancy. Then the transient performance,steady performance,and computational complexity of the algorithm are ***,the experiment results demonstrate that the algorithm can improve the synthetic performance of rate control through the compromise between the end-to-end delay and the playout quality.

关键词： streaming media rate control transcoder wireless local area network H.264/AVC.

来源：评论

学校读者我要写书评

暂无评论

Joint optimization of the motion estimation module and the Up/Down scaler in transcoders

引用

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY 2005年第10期15卷 1303-1313页

作者： Han, JK Kwak, SM Kim, J Sejong Univ Dept Informat & Commun Engn Seoul 143747 South Korea Engn Net & TV Corp Seoul 137875 South Korea

A joint design scheme is proposed to optimize the up/down scaler and the motion vector estimation module in the transcoder system. The proposed scheme first optimizes the resolution scaler for a fixed motion vector, and then a new motion vector is estimated for the fixed scaler. These two steps are iteratively repeated until they reach a local optimum solution. In the optimization of the scaler, we derive an adaptive version of a cubic convolution interpolater to enlarge or reduce digital images by arbitrary scaling factors. The adaptation is performed at each macroblock of an image. In order to estimate an optimal motion vector, a temporary motion vector is composed from the given motion vectors. Then the motion vector is refined over a narrow search range. It is well-known that this refinement scheme provides the comparable performance compared to the full search method. Simulation results show that a jointly optimized system based on the proposed algorithms outperforms the conventional systems. We can also see that the algorithms exhibit significant improvement in the minimization of information loss compared with other techniques.

关键词： cubic convolution scaler interpolation motion vector estimation transcoder

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：