determination_of_soudness_level

matlab code for modelling

Wavelet denoising For using this code need to use signal toolbox and general toolbox in your matlab In the first part of this assignment, we asked to obtain a (black-and-white) digital image of size 512 by 512 and then generate noisy image by adding a Gaussian noise but under the condition of having SNR=20dB by select the suitable value of variance for Gaussian noise formula. Second step is performing wavelet denoising using the hard thresholding (Use the db 6 for four levels) in the condition of finding the optimal thresholding value of T in terms of the SNR obtained. It means that, we should find the highest SNR value by finding the suitable value for threshold. Then we asked to do the same process but this time using soft thresholding. Finally for the last part of question one, we should compare the results of the obtained SNR with the recommendations of 3*sigma for the hard thresholding and 3/2*sigma for the soft thresholding.

MAT4 MAT4 MAT4 MAT4

数学模型 描述系统输入、输出变量以及内部各变量之间关系 的数 学表达式 建模方法 解析法（机理分析法） 根据系统工作所依据的物理定律列写运动方程 实验法（系统辨识法） 给系统施加某种测试信号，记录输出响应，并用 适当的数学模型去逼近系统的输入输出特性(no more)

自动控制技术及其应用在现代科学技术的许多领域中，自动控制技术起着越来越重要的作用(Automatic control technology and its application in many areas of modern science and technology, automatic control technology plays an increasingly important role)

遗传算法是兼职编码求函数的极大值程序，比较详细。(A function or part-time coding genetic algorithm (ga) is a great value program, more detail.)

桁架结构动力分析，包括坐标转换矩阵、单元质量矩阵等(Truss structure,Including coordinate transformation matrix unit mass matrix, etc.)

image retrieval,content based image retrieval

说明：  利用EKF实现单站相位差变化率定位，并计算CRLB、画GDOP图。参考文献为《一种快速高精度无源定位方法的研究》(Using EKF to locate the change rate of single station phase difference, calculate CRLB and draw GDOP diagram. References are "Research on a Fast and High Precision Passive Location Method")

MATLAB编程语言教程基础The basis of MATLAB programming language tutorial(MATLAB programming language tutorial basis The basis of MATLAB programming language tutorial)