roterkongzhi

digital watermarking is a process by which a user-specified signal is hidden or embedded into another signal , for example digital content such as electronic documents, images, sounds and video [2]. The use of digital video applications such as video-conferencing, digital television, digital cinema, distance learning, videophone, and video-on-demand has grown very rapidly over the last few years. Today it is much easier for the digital data owners to transfer multimedia data over the internet, and hence the data could be perfectly duplicated and rapidly redistributed on a large scale. Thus, the importance of copyright protection for multimedia data has become more critical. Digital watermarking is an effective way to protect the copyright of multimedia data even after its transmission there is urgent demand for techniques to protect the original digital data and to prevent unauthorized duplication or tampering.

对于线性系统，输入输出在某频率点为正弦，利用本程序可以得到改频率点的幅值比和相位差。data文件为两组数据，通过matlab读取xls文件，可以用来验证本程序。(For linear systems, input and output sine wave at a frequency point, the use of this program can change the frequency by the amplitude ratio and phase difference. data files for the two sets of data, read by matlab xls files, can be used to test the program.)

数字图像处理姚敏版第八章小波图像编码所有例子的完整matlab代码 可以正确运行(Yao Min version of Digital Image Processing VIII wavelet image coding complete matlab code for all examples run correctly)

说明：  Implementation of MA process.

This code uses newton interation to calculte user s position in indoor case.

用于灰色模型的应用，适用于解决简单数学建模的问题。(For the application of grey model, applicable to solve a simple problem of mathematical modeling.)

这是curvelet工具包，目前最新的版本，是从网上搜集来的。(This is the curvelet Toolkit, the latest version of the current is collected from the Internet.)

反距离加权插值法idw的matlab算法，含文件《IDW在医学断层图像可视化中的应用》及《基于ArcGIS两种空间插值方法的比较》。(Matlab algorithm, inverse distance weighted interpolation method idw file containing " IDW medical images visualization based on ArcGIS two spatial interpolation method of comparison." )

a code for soliton in SSFM methode

QPSK的误码率仿真和瑞利信道在AWGN下的仿真。(QPSK BER simulation and Rayleigh channel simulation in AWGN' s.)