PDS_Lucrarea4

模式识别中关于特征选择和特征提取的知识。。。(Pattern recognition on feature selection and feature extraction of knowledge. . .)

好用地 matlab 区域增长算法，先输入比较范围，再输入种子点数目，然后就是手动选取种子点了 ，好运哦！(good land Matlab regional growth algorithm, importing more scope to import seed spots, Then, they manually select seed, good luck!)

说明：  Wireless Sensor Networks WSNs Modified LEACH

一种简单快速的视频分割方法，针对多媒体视频序列(A simple method of fast video segmentation, video sequences for multimedia)

psk modulation is done using simulink model in this document. hope u get knowledge

B-M 算法的matlab实现 密码学中又一重要的算法实现(BM algorithm matlab achieve another important cryptography algorithm implementation)

该压缩包实现二维的DCT变换和逆DCT变换，可以对图像做DCT变换和逆DCT变换，实现非常简洁，速度很快。(the compressed 2D DCT and the inverse DCT. Images can be done DCT and inverse DCT achieve a very simple, very fast.)

对时频峰值地震噪声的滤波及对实际信号的处理、(Time-frequency seismic noise on the peak of the actual signal filtering and processing,)

试者工作特征曲线 （receiver operating characteristic curve，简称ROC曲线），又称为感受性曲线（sensitivity curve）。得此名的原因在于曲线上各点反映着相同的感受性，它们都是对同一信号刺激的反应，只不过是在几种不同的判定标准下所得的结果而已。接受者操作特性曲线就是以虚报概率为横轴，击中概率为纵轴所组成的坐标图，和被试在特定刺激条件下由于采用不同的判断标准得出的不同结果画出的曲线。(PLOTROC Plot receiver operating characteristic. Syntax plotroc(targets,outputs) plotroc(targets1,outputs1, name1 ,targets,outputs2, name2 , ...) Description PLOTROC(TARGETS,OUTPUTS) plots the receiver operating characteristic for each output class. The more each curve hugs the left and top edges of the plot, the better the classification. PLOTROC(TARGETS1,OUTPUTS2, name1 ,...) generates multiple plots. )

参考了张家凡的振动信号的包络解调分析方法研究及应用，实现了轴承信号的仿真(Reference envelope demodulation method and application Zhang Fan vibration signal to achieve a simulation of bearing signals)