HW1_1

an inferior assistant or a channel administrator hopes to append some additional message, such as the origin information, image notation or authentication data, within the encrypted image though he does not know the original image content. some parameters are embedded into a small number of encrypted pixels, and the of the other encrypted pixels are compressed to create a space for accommodating the additional data and the original data at the positions occupied by the parameters

说明：  matlab聚类分析工具箱，很好用。大家可以试一试(Matlab Toolbox cluster analysis, is useful. We can try)

说明：  短时傅里叶变换的样例，时长1000，采样250，短时傅里叶变换STFT，短时傅里叶变换STFT，短时傅里叶变换STFT(Short time Fourier transform)

The simplest channel which we use in ideal case is AWGN channel and everyone knows that before starting siluation on the other part of the system we must simulate the AWGN channel.this is AWGN channel with a BPSK signal going through it and finally we detect the signal and plot BER vs SNR to compair with the theory.

把当前图形窗中已存在的任何字对象拖放到所需的位置；向当前图形窗输入字对象，并拖放到任何所需位置。 (align current graphics window which has been in existence for the drag and drop any object to the word for the position; current graphics to the window object input characters, and drag-and-drop to any required position.)

MATLAB problem for Poleplacement and state observer system

利用MALAB实现的关于变压器差流计算的问题，对差流的提取很有意义。(MALAB achieve on transformer differential current calculated differential current extraction makes sense.)

小波分析，用于时间序列的周期性分析，更换函数即可使用(Wavelet analysis is used for periodic analysis of time series, and can be used to replace functions.)

说明：  用MATLAB编写离散小波变换实现数字水印技术(Discrete wavelet transform digital watermarking technology)

It s a simple program in detecting abnormalities in egg.