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1. 电子科技大学中山学院 计算机学院, 广东 中山 528402
2. 广东工业大学 自动化学院, 广东 广州 510006
[ "杨亮(1980-),男,江西婺源人,硕士,讲师,主要从事嵌入式系统、机器人、自动控制等方面的研究。E-mail:alex_yangliang@foxmail.com" ]
[ "邓春健(1980-),男,广东乐昌人,博士,教授,硕士生导师,主要从事嵌入式系统、LED大屏幕控制等方面的研究。" ]
[ "宋喜佳(1985-),男,黑龙江人,博士,讲师,主要从事嵌入式系统、LED大屏幕控制等方面的研究。" ]
收稿日期:2014-03-14,
修回日期:2014-05-01,
纸质出版日期:2014-12-05
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杨亮, 邓春健, 宋喜佳. 一种基于嵌入式平台屏幕内容分享系统的设计与实现[J]. 液晶与显示, 2014,29(6): 933-938
YANG Liang, DENG Chun-jian, SONG Xi-jia. Design and implementation of a screen sharing system based on embedded platform[J]. , 2014,29(6): 933-938
杨亮, 邓春健, 宋喜佳. 一种基于嵌入式平台屏幕内容分享系统的设计与实现[J]. 液晶与显示, 2014,29(6): 933-938 DOI: 10.3788/YJYXS20142906.0933.
YANG Liang, DENG Chun-jian, SONG Xi-jia. Design and implementation of a screen sharing system based on embedded platform[J]. , 2014,29(6): 933-938 DOI: 10.3788/YJYXS20142906.0933.
为了实现多种智能设备之间低带宽高画质的屏幕内容分享,设计了一种基于嵌入式平台大屏幕内容分享系统。该系统由跨平台客户端及基于嵌入式平台的服务器端两部分组成,针对传统屏幕内容分享系统占用带宽大、不适合分享高分辨率视频信息的缺点,提出了一种基于场景识别的码率自适应调整算法,该算法采用H.264编码方式,能够根据网络拥塞状况及当前屏幕的应用场景对H.264码率进行自适应调整,以达到节约带宽、提高画质的目的;另一方面,服务器端基于嵌入式平台,采用多线程并发设计,将视频的接收、解码、显示分线程独立处理,在提高程序的健壮性的同时降低了程序的耦合性。实验结果表明,该系统支持720 p高分辨率视频信息共享,具有成本低、占用带宽小、实时性高的优点。
In order to share screen among intelligent devices with high quality and low band width
a screen sharing system based on embedded system has been designed and implemented
which consists of a cross-platform client and server. For the purpose of reducing bandwidth and improving screen quality
a self-adaptive method based on scene recognition is proposed
which could recognize the application scene intelligently and adjust H.264 code rate according to network congestion state and application context. On the other hand
the server has been deployed on embedded board. For the server side
a solution based on multiple threads has been proposed
which consists of main thread
message receiving thread
decode thread and display thread. Every thread focuses on their own task
which could improve the robustness and coupling dramatically. Experiment results show that the proposed screen sharing system could support screen sharing between PC and embedded display system with 720 p high resolution. And this solution has the advantages including real time
low-bandwidth and low cost.
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