快速Internet小波图像传输  

Fast Image Transmission over Internet

作　　者：俞毅刚[1] 龚建荣[1] 周华芬 

机构地区：[1]南京邮电学院,硕士研究生南京210003 [2]无锡轻工大学,无锡214036

出　　处：《电讯技术》2000年第5期19-22,共4页Telecommunication Engineering

摘　　要：图像通常利用无损协议 (如TCP/IP)在因特网上进行传输。无损协议需要重发丢失的数据包 ,而这必然引起传输时间的增加。本文介绍了压缩图像的一种快速有损因特网图像传输方案 (FLIIT)。它通过添加冗余比特保护图像的重要部分来消除重发时延。文中论述了一种高效地分配量化比特和冗余比特来控制量化误差和预测数据包传输丢失的信源和信道联合编码算法。并讨论了这种算法的实现过程 ,以及将它在Internet上传输的性能与相同图像利用TCP/IP协议传输的性能进行比较。通过实验发现 ,得到相同质量的图像 ,用FLIIT方案比TCP/IP快Images are usually transmitted across the Internet using a lossless protocol such as TCP/IP. Lossless protocols require retransmission of lost packe ts; which substantially increase transmission time .We introduce a fast lossy In ternet image transmission scheme (FLIIT) for compressed images which eliminates retransmission delays by strategically shielding important portions of the image with redundancy bits. This paper describes a joint source and channel coding al gorithm efficiently allocates quantizer resolution bits and redundancy bits to c ontrol quantization errors and expected packet transmission losses. It also desc ribes an implementation of this algorithm and compare its performance on the Int ernet to lossless TCT/IP transmission of the same images. In the experiments the FLIIT scheme transmitted images five times faster than TCP/IP during the day wi th resulting images of equivalent quality.

关 键 词：小波变换 因特网 图像传输 

分 类 号：TP393.4[自动化与计算机技术—计算机应用技术] TN919.8[自动化与计算机技术—计算机科学与技术]