3D Video Transmission System for China Mobile Multimedia Broadcasting

Transcription

1 Applied Mechanics and Materials Online: ISSN: , Vols , pp doi: / Trans Tech Publications, Switzerland 3D Video Transmission System for China Mobile Multimedia Broadcasting Ming Yan 1, a *, Xin-gang Wang 2,b and Jun-feng Li 1,c 1 GxSOC Research Institute, Communication University of China, Beijing , China 2 Administrative Center for The DTH Service in China, Beijing , China a yanming668@gmail.com, b xingang718@163.com, c lijfzcm@163.com Keywords: China Mobile Multimedia Broadcasting, 3-dimensional Video, Splicing mode, Electronic Service Guide. Abstract. With the popularization of three dimensional (3D) video on TV, some related aspects, such as broadcast television network transmission, technology application, and content products and so on, will face the challenges of the new technology. Rapid progress has been achieved in the China Mobile Multimedia Broadcasting (CMMB) technology, 3D TV technology applied in the mobile TV will become the bright spot in the future. This paper firstly introduces the transmission modes of 3D TV, and then gives the technology solution of 3D TV and the upgrade solution of electronic service guide Electronic Service Guide (ESG) based on CMMB. Test result shows that the new system with 3D video can work correctly when the 3D video was encoded with H.264 standard and the image resolution was conformed to the standard definition (320x240). Introduction Over the past five years, the technology of CMMB Mobile TV has gotten the rapid development and the network of CMMB Mobile TV has covered more than 300 cities in China. CMMB has made great achievements in network coverage, customer development, product design and other aspects, but with the rapid development of network video, mobile TV, IPTV and other new media, the demand of market and customers for CMMB becomes higher and higher. Especially, digital media develops quickly in recent years, so forming a more competitive and influential all-media platform with the integration with other media on the basis of the development on the existing platform, has become an inevitable trend for future development of CMMB. In early 2012, our country started broadcasting 3D test program in the cable television network, which set off a strong storm of 3D in the world of broadcast television industry. Sales volume and cognition degree have greatly improved. TV manufacturing has an unprecedented power and the whole industry of 3D TV also showed unprecedented enthusiasm. With the gradual popularization of 3D TV, the leading position of broadcast television network transmission, technology application and content products will be further improved, which injected fresh momentum for the next prosperous development of radio and television. Under the background of the development of CMMB 3D mobile TV channels, both on the technical innovation, and resource integration, will make the CMMB add a strong competition in the future development[1]. Transmission modes of 3D Mobile TV 3D TV is a new television to simulate real spatial relationship of the actual scene, which uses the visual characteristics of the human eye to produce three-dimensional, so that the audience feel the image is three-dimensional view of a scene with depth features on the screen.3d TV can be divided into double-picture 3D TV used in 3D TV test channel in China,multi-view 3D TV and real 3D TV. Based on the existing traditional TV development and test result,cmmb Mobile TV 3D channel will be able to viewed at anytime and anywhere after optimization and upgrade[2][3]. All rights reserved. No part of contents of this paper may be reproduced or transmitted in any form or by any means without the written permission of Trans Tech Publications, (ID: , Pennsylvania State University, University Park, USA-09/04/16,03:58:26)

2 470 Computer and Information Technology The transmission mode of 3D TV based CMMB mainly includes: splicing mode, dual synchronous mode, MVC mode, 2D plus depth mode, etc. and then each of transmission modes is briefly introduced. Splicing mode The left path video and right path video of 3D TV will be spliced into one path video. Then the video will be encoded and transmitted. This method has the advantages that front-end equipment can be changed the minimum and the method takes up less bandwidth and is easy to implement. Being not compatible with the existing terminal of 2D is the disadvantage of the method. Dual synchronous mode The left path video and right path video is encoded separately and then the videos are transmitted synchronously. The method is compatible with the existing terminal of 2D and is easy to implement. This method has the disadvantages that encoders, multiplexers and other equipment needed for the front-end was modified accordingly in terms of synchronization and the method takes up greater bandwidth[4][5]. MVC mode The left path video and right path video of 3D TV is encoded with the standard of H.264.MVC. The method saves bandwidth compared to dual synchronous mode and has higher definition compared to splice mode, what is more, the method is compatible with the existing terminal of 2D.This method has the disadvantages that the encoder of front-end equipment must be replaced and the related products are rare because of the industry of the MVC encoder is not mature [6][7]. 2D plus depth mode The mode of deep encoding will be used in the left path video and right path video of 3D.Currently, the encoder of 2D plus depth is at the research stage and there is no corresponding standard[8][9]. System solution of CMMB whit 3D TV By analyzing the result of compatibility test of the existing terminal of 2D, most of the terminal of 2D cannot display the splicing video of 3D TV programs, and most of the existing terminal decoding resolution is fixed in 320 x240, which are unable to decode other high-resolution video. To avoid the impact on the existing terminal of 2D, 3D TV uses a proprietary 3D TV channel to broadcast By marking 3D TV channel with the ESG Service ID and Service Type, the 3D TV channel cannot be able to display in the most existing terminal of 2D.The terminal of 2D produced in the future can completely block out 3D TV business, so that the program list will not display. Electronic Service Guide According with multiplex parts (GY/T ): Mobile Multimedia Broadcasting Part 3: Electronic Service Guide of CMMB standard [10], electronic service guide revised the Service ID and Service Type and added the description of the parameters of 3D business. New service identity is defined as showed in table 1. Table 1 Service ID and its Distribution in ESG Service ID Values Distribution 0x x003F 0x x00FF ESG data information 0x x01FF 0x x3FFF Continuous Service 0x x7FFF Short time Service 0x xAFFF 3D Service 0xBFFF--0xFFFF 3D TV Service Types are extended in the original type of services. It is 3D TV when the value of Service Type equals to 8. Related parameters of 3D TV service are described, for example: parallax

3 Applied Mechanics and Materials Vols information used in ESG, where you can add descriptions of splicing mode, dual synchronous mode, MVC mode and so on,reserved for future implementation. Technology structure of 3D TV Splicing mode is chosen as the main transmission mode of 3D TV based on CMMB. First, the left path video and right path video of 3D TV are spliced into one path video. Then the video will be encoded and transmitted. This method has the advantages that front-end equipment can be changed the minimum and the method takes up less bandwidth and is easy to implement. Fig. 1 System Block Diagram with 3D Video on CMMB The 3D video channel of CMMB mobile TV is added in Figure 1 and relevant contents of 3D TV technology solutions are described in the gray function modules, mainly including 3D video input, coding, ESG, multiplexing, CMMB 3D receiving decoding terminals, etc. Test Result The signals of 3D video collected by 3D camera, including the left path signal and the right path signal, are transmitted into an encoder according to a certain format. The output of the encoder is the code stream of 3D programs. Streams reused with the audio and video data stream of 2D CMMB, data services, emergency broadcast information, etc. are transmitted in the CMMB broadcasting channel, then the users that has decoding terminal are able to watch the 3D mobile TV program. 3D video coding should be consistent with H. 264 coding standard and conform to the H. 264 base class (Baseline Profile), 3.0. The video frame rate should meet the 25 frames per second, image resolution should support standard definition (640 x480) and the following and the length-width ratio should support 4:3 and 16:9. Conclusions The high and new technology, especially network information technology has got rapid development at present. The concept, transmission channel and transmission method of media are undergoing profound changes and adjustments. In order to strengthen the construction of important media, the new situation and new trend must be grasped and the ability of public opinion guidance, digital editorial broadcast and overall development of the traditional media and new media must be improved. With the development of new media market and technology change quickly, higher requirements will be put forward for the new media CMMB mobile phone. The author analyzes technology of 3D TV, which has made a technical planning for 3D television programs transmitted on CMMB and has laid a solid foundation for 3D TV transmission on CMMB. With the continuous development of technology of 3D TV, rich 3D TV will broadcast on everyone's cell phone. ACKNOWLEDGMENT This work was financially supported by the Social Science Research Foundation of the State Administration of Radio Film and Television in China under the title of Research on new services models for Mobil TV under the background of Three Networks Convergence (Project No.: GDT1221).

4 472 Computer and Information Technology References [1] Qun Zhang, Present status and development perspective of mobile TV under three network convergence, M.S. thesis, Northeast Normal university, China, 2012 (In Chinese). [2] K. Jung, Y. K. Park, J. K. Kim, H. Lee, K. Yun, etc.: The 10th International Conference on Advanced Communication Technology, Vol.3 (2008), p [3] S. Choi, C. Jung, S. Lee, J. K. Kim, K. Jung, G. Lee, etc.: The 11th IEEE International Symposium on Multimedia(2009), p [4] H. Lee, K. Yun, N. Hur, J. Kim, B. C. Min, J. K. Kim: 3DTV Conference (2007), p.1-4. [5] S. Cho, N. Hur, J. Kim, K. Yun, S. Lee: IEEE international Conference on Multimedia and Expo (2006), p [6] G. Lee, H. Lee, K. Yun, B. Lee ; N. Hur, J. W. Kim, S. Lee: International Conference on Consumer Electronics (2010), p [7] Jing-jing HAN, Su-mei LI, Bao-liang WANG, De-xin GAO: Application Research of Computers, Vol (2012), p [8] Dong-dong HUANG, Yi-xiong ZHANG, Jiang-hong SHI: Journal of Xiamen University, Vol (2013), p [9] S. Cho, N. Hur, J. Kim, S. Lee: International Conference on Consumer Electronics (2007), p.1-2. [10] State Administration of Radio, Film and Television, GY/T , Mobile multimedia broadcasting-part 3: Electronic service guide, 2007.

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