正交频分复用系统中基于人眼视觉系统的自适应图像传输.PDFVIP

第25卷第2期 计算机应用 Vol_25 No．2 2005年2月 Computer Applications Feb．2oo5 文章编号：1001—9081(2005)02—0335—03 正交频分复用系统中基于人眼视觉系统的自适应图像传输 亓中瑞，高振明 (山东大学信息科学与工程学院，山东济南250100) (qzrshanda@sdu．edu．cn) 摘 要：针对传统的图像传输方法，提出了一种基于人眼视觉系统的自适应图像传输方案。在 OFDM系统中，通过将自适应技术与信源分割及信道特性相结合的方法，实现在频率选择性慢衰落信道 中高质量的图像传输。为验证该方法的良好性能，三种不同图像源被用于仿真程序中。仿真结果及理 论分析可以证明，自适应图像传输与传统的图像传输相比，可大幅地提高接收图像的峰值信噪比。 关键词：自适应图像传输；正交频分复用(OFDM)；人眼视觉系统(HVS) 中图分类号：TP391．41 文献标识码：A Adaptive image transmission scheme based on human visual system in OFDM QI Zhong—rui，GAO Zhen—ming (School of Information Science and Engineering，Shandong University,Jinan Shandong 250100，China) Abstract：According tO the conventional image transmission method，an adaptive image transmission scheme based on HVS in OFDM(Orthogonal Frequency Division Multiplexing)system over frequency selective slow fading channel was proposed in this paper．It combined adaptive sub—channel distribution technique with source partition and characteristics of fading channel tO improve the quality of received image．In order to verify the good performance of the proposed method，three kinds of image were used in the simulations．Significant improvement in PSNR(Peak Signal Noise Ratio)of received image with adaptive image transmission relative tO conventional one is demonstrated by the simulation results of three different image sources and theoretical analysis． Key words：adaptive image transmission；Orthogonal Frequency Division Multiplexing(OFDM)；Human Visual System (HVS) 长期以来，通过对人眼某些视觉现象的观察，并结合视觉 0 引言 生理、心理学等方面的研究成果，发现了各种各样的视觉掩盖 未