Chapter_4

I have thoroughly study the basic of image compression techniques. From that I have selected SPIHT algorithm for my research work. I have implemented on image compression for gray images using SPIHT algorithm. Image compression is implemented using this algorithm has better result over the previous result on gray images and also improved PSNR value high but on other side low result on compression ratio.

FDTD仿真喇叭天线，能观察得到其电场在自由空间随时间的分布情况。(FDTD method is a time domain analysis.Here we first we design a wave-guide and there after we just increase its broad side.Our aim is to this simulation is plotting its electric field response with time and how will it response in outside free space. Here we just take 170 time steps one who can interested in antenna designing they can also plot the radiation pattern of this HORN antenna.Just take the field in the outside the mouth of HORN antenna and there do the simple formula to near filed far field transfer and measure it at your band of antenna.Best of LUCK all of you.)

mie理论数值模拟，分析散射光强和散射角的关系。(the theory of mie Numerical simulation ,analyzing the relationship between light intensity and angle.)

这是一个用于线性调频雷达信号代码，可供参考(This is a code for linear FM radar signal, for reference)

face detection and face recognition system .a test code for reasercher

a matlab code for solving TSP using simulated annealing (SA)

本文是关于QPSK测试的matlab源码(This article is about the QPSK test matlab source)

implement linear regression

Sea Water分析包主要用于海洋要素分析包括：温盐密度的计算等，是一个很好的海洋要素分析包。(seawater )

简易的数字通信系统matlab软件模拟。主要是采用汉明7，4编解码，信道衰减采用瑞利模型等。(Simple digital communication system simulation matlab software. Mainly used Hamming 7,4 codec, channel attenuation Rayleigh model.)