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this code describes image encryption process of color image using Matlab

《MATLAB程序设计教程》电子教案，离散时间信号与系统的Matlab实现(" MATLAB Programming Guide" e-lesson plans, discrete-time signal and system Matlab Implementation)

说明：  高通滤波器，带通滤波器，数字FIR滤波器(The Shannon entropy is a measure of the average information content one is missing when one does not know the value of the random variable. The concept was introduced by Claude E. Shannon in his 1948 paper "A Mathematical Theory of Communication". Shannon s entropy represents an absolute limit on the best possible lossless compression of any communication, under certain constraints: treating messages to be encoded as a sequence of independent and identically-distributed random variables, Shannon s source coding theorem shows that, in the limit, the average length of the shortest possible representation to encode the messages in a given alphabet is their entropy divided by the logarithm of the number of symbols in the target alphabet. )

matlab开发的leach协议，完全可以用(Wireless sensor network routing)

采用时频聚集性较好的线性调频信号作为线性时不变系统输入激励，采用Gabor字典作为过完备原子库。在利用传统系统辨识法之前先利用稀疏分解算法将输出信号进行去噪处理，显著提高系统辨识精度。 具体包括互谱算法，信号的Gabor稀疏分解的详细代码(Space can be a time for sparse decomposition to solve the problem of huge memory needed。This approach, combined with the rapid decomposition of FFT for signal ,so as to achieve satisfactory results.)

说明：  MatLab工程数学应用 一书的电子版，内容非常实用(MatLab Application Engineering Mathematics electronic version of the book, the content is very practical)

bp网络训练工具箱适合新手学习和使用很有好处(Bp neural network training kit for beginners learn and use is very good )

matlab/simulink建的混合动力汽车模式切换建模，可以根据不同的信号进行各种模式之间的切换(Matlab/Simulink built hybrid vehicle mode switching modeling, and can switch between various modes depending on the signal)

在MATLAB下实现FSK调制解调。并画出了每一步的波形以及功率谱密度图(in MATLAB under FSK modulation and demodulation. And the mapping out of every step of the waveform and power spectral density map)