88568477Allan

Matlab source code for DCT-based watermarking for grayscale images. DCT-based watermark recovering without resorting to the uncorrupted original image. Digital watermarking has been proposed as a viable solution to the need of copyright protection and authentication of multimedia data in a networked environment, since it makes possible to identify the author, owner, distributor or authorized consumer of a document. A new watermarking technique to add a code to digital images is presented: the method operates in the frequency domain embedding a pseudo-random sequence of real numbers in a selected set of DCT coefficients. Watermark casting is performed by exploiting the masking characteristics of the Human Visual System, to ensure watermark invisibility. The embedded sequence is extracted without resorting to the original image, so that the proposed technique represents a major improvement to methods relying on the comparison between the watermarked and original images.

说明：   Buck－Boost电路的建模与仿真主程序

此程序用matlab语言编写用于卡尔曼滤波精对准和组合导航解算时候滤波用(the program is composed by matlab and used in KF alignment and ingrated navgation filter)

光伏并网发电系统有源频率漂移孤岛检测法(AFD)(active frequency drift(AFD) island detection method of photovotaic grid-connected generation system)

全数字接收机中符号同步的文档，方法实用，容易实现~~(Symbol synchronization in digital receivers documentation, methods, practical and easy to implement ~ ~)

matlab程序 用于小波变换等相关变换 程序用过 挺好的(Matlab procedures for the wavelet transform, and other related procedures used very well transform the)

典型的多项式快速傅里叶变换程序，现在只做到三阶，为初学者提供参考。(A typical polynomial fast Fourier transform program, now only do third-order, provide a reference for beginners.)

matlab中仿真模拟leach算法，绘图结果正确(good leach)

基于MATLAB的jPEG压缩程序，很实用！(matlab，jpeg compression)

利用改进的相位一致性原则实现图像的边缘检测，效果非常好，内含两幅实验图像与四个子代码。(simulating using the principle of Phase consistency to image edge detection, the effect is very good, including two experimental image and the four sub-code.)