CAJ | 학술논문

∶为了使遥感影像在虚拟地球平台快速、平滑地发布，提出了一个实时压缩及渐进传输系统。论证了金字塔模型中最佳瓦片大小，对客户端请求区域的每个瓦片，服务器采用SPIHT算法进行实时压缩，码流每达到一定长度则立即打包发送，同时压缩继续进行。客户端每收到一个包则立即解压，并对已显示图像动态更新。实验结果表明∶该系统能够实现压缩、传输、解压、显示同步进行，客户端看到的图像能够快速平滑过渡至最清晰，克服了传统方法中图像“阶跃”显示的问题。
∶위료사요감영상재허의지구평태쾌속、평활지발포，제출료일개실시압축급점진전수계통。론증료금자탑모형중최가와편대소，대객호단청구구역적매개와편，복무기채용SPIHT산법진행실시압축，마류매체도일정장도칙립즉타포발송，동시압축계속진행。객호단매수도일개포칙립즉해압，병대이현시도상동태경신。실험결과표명∶해계통능구실현압축、전수、해압、현시동보진행，객호단간도적도상능구쾌속평활과도지최청석，극복료전통방법중도상“계약”현시적문제。
∶In order to make the remote sensing image released quickly and smoothly, a real-time compression and progressive transmission system is proposed in this paper.Firstly, the optimum size of tile of the pyramid model is deduced.Secondly, each tile requested by the user is compressed by SPIHT ( set partitioning in hierarchical trees) at the server.Next, the code stream is packed in a package and sent to the client as soon as the length of the code stream reaches the given length.In the meanwhile, the compression in the server is continued.For the client, it would be decompressed immediately when a packet is received and the image on the display would be updated dy-namically.The experimental results showed that the compression, transmission, decompression, and display in the system can operate simultaneously.The image can be seen from coarse to very fine smoothly and quickly in the cli-ent.So the problem that image display"jumps"in the client is resolved.