keypointExtraction

用Hanning窗设计线性相位滤波器，绘制幅频和相位特性曲线，并在改变N的值后观察N对滤波器特性的影响及其时域特点。(Hanning window with a linear phase filter design, drawing amplitude frequency and phase characteristic curve, and change the value of N, N were observed on the filter characteristics and time domain characteristics.)

此代码主要用于车牌定位一块，有兴趣得车友们可以供参考，不足还请海涵，谢谢一起探讨(This code is mainly used to locate a license plate, car lovers may be interested in for information, less than requested Haihan, thank you to explore)

说明：  非常好的常微分方程数值解法讲解参考书，主要内容为常微分方程(ODEs)的MATLAB数值解法，来自多个论坛高手的经验方法(Very good reference book to explain numerical solution of ordinary differential equations, ordinary differential equations for the main (ODEs) of the MATLAB numerical solution, the experience of experts from a number of methods forum)

DC power is steady and continuous, with an electrical charge that flows in only one direction. When the output of DC power is represented on a graph, the result would be a straight line. AC power, on the other hand, flows back and forth in alternating directions so that, when represented on a graph, it appears as a sine wave, with smooth and regular peaks and valleys. A power inverter uses electronic circuits to cause the DC power flow to change directions, making it alternate like AC power. These oscillations are rough and tend to create a square waveform rather than a rounded one, so filters are required to smooth out the wave, allowing it to be used by more electronic devices. AdChoices

PROJECT 02-02 Reducing the Number of Intensity Levels in an Image (a) Write a computer program capable of reducing the number of intensity levels in a image from 256 to 2, in integer powers of 2. The desired number of intensity levels needs to be a variable input to your program. (b) Download Fig. 2.21(a) from the book web site and duplicate the results shown in Fig. 2.21 of the book. Laboratory Projects_DIP3E 的02-02項目(PROJECT 02-02 Reducing the Number of Intensity Levels in an Image (a) Write a computer program capable of reducing the number of intensity levels in a image from 256 to 2, in integer powers of 2. The desired number of intensity levels needs to be a variable input to your program. (b) Download Fig. 2.21(a) from the book web site and duplicate the results shown in Fig. 2.21 of the book.)

This is a protocol for Heterogeneous WSN

对光纤中光的传播特性进行仿真（包括单模和多模光纤）(Simulation of optical propagation characteristics in optical fibers (including single-mode and multimode fiber))

用数值分析中的二分法求解函数值。很简单，但是正确，可以直接使用(bisect)

现代信号处理中的分数阶傅里叶变换（FRFT）的MATLAB代码，对分析信号比较有用(Fractional Fourier Transform（FRFT）code in matlab for study modern signal processing.)

说明：  RINEX 2.1 导航电文文件读取程序(RINEX2.1 navigation data file read)