exam4_2

图像变化检测算法，由t检验得到差分图像的变化掩膜。左后成功检测到图像中运动的物体。(Image change detection algorithms have been tested by the t change difference image mask. Left a successful campaign to detect objects in images.)

它是matlabgui函数界面说明it is matlab of gui function (it is matlab of gui function )

第k小元素（分治法） 给定一个线性序列集，要求求出其中指定的第K小的数的值和位置.如给定n个元素和一个整数i，1≤i≤n，输出这n个元素中第i小元素的值及其位置；(First k small element (divide and conquer) Given a set of linear sequence, where the specified requirements determined the K value and the small number of locations, such as a given n elements and an integer i, 1 ≤ i ≤ n, output this is the n elements of the i-th element value and the position of the small )

the algorithm is about edge detector that is used to detect edges in an image. Prewitt , SobeL and Robertsfilters are used

Jacobi algorithm to solve linear problems

对一幅图像的频谱进行频率位移，移到窗口中央，并显示出频率变换后的频谱图(The frequency spectrum of the image frequency shift, to move the central window, and shows the spectrum after the frequency conversion)

伺服系统非线性Lugre摩擦力模型仿真 matlab(servo system Lugre friction model nonlinear simulation Matlab)

基于MATLAB的双音多频（DTMF）信号的产生、接收以及可视化拨号系统的实现(MATLAB-based dual-tone multi-frequency generation (DTMF) signals, the receiver and dial visualization system)

平行平面腔的数值分析,由方形反射镜组成的平行平面腔中，反复利用Fresnel-kirchoff公式，求出镜面场分布(Numerical analysis plane parallel cavity, formed by a square mirror plane parallel chambers, the repeated use of Fresnel-kirchoff formula mirror field distribution obtained)

说明：  带通滤波。该程序用matlab实现梯形窗的带通滤波，可以直接调用(Band-pass filter. Trapezoidal matlab implementation of the program window with a band-pass filter, can be called directly)