CAJ | 학술논문

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.
위료실현다충지능설비지간저대관고화질적병막내용분향，설계료일충기우감입식평태대병막내용분향계통.해계통유과평태객호단급기우감입식평태적복무기단량부분조성，침대전통병막내용분향계통점용대관대、불괄합분향고분변솔시빈신식적결점，제출료일충기우장경식별적마솔자괄응조정산법，해산법채용 H.264편마방식，능구근거망락옹새상황급당전병막적응용장경대 H.264마솔진행자괄응조정，이체도절약대관、제고화질적목적；령일방면，복무기단기우감입식평태，채용다선정병발설계，장시빈적접수、해마、현시분선정독립처리，재제고정서적건장성적동시강저료정서적우합성.실험결과표명，해계통지지720 p 고분변솔시빈신식공향，구유성본저、점용대관소、실시성고적우점.
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 pro-posed 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.