GS_phase_retrieval

说明：  一个从网上找来的屏幕截取代码，需要的就看看吧(A screen from the Internet and got the interception code, need to look at it)

本书可作为信息处理、计算机、机器人、人工智能、遥感图像处理、认知神经科学等有关专业的高年级学生或研究生的教学用书，也可供相关领域的研究工作者参考。(This book can be used as information processing, computer, robot, remote sensing image processing, artificial intelligence, cognitive neuroscience and related professional senior student or graduate student s teaching resources, also can be used for reference in the related areas of research workers.)

单像素相机是基于压缩传感理论实现的，是数码相机发展的另一个革命性的方向，包括了所有单像素前沿的文献(Single-pixel camera is based on compressed sensing theory to achieve, is another revolutionary development direction of digital cameras, including the literature of all single-pixel frontier)

利用matlab画完整版中国地图包括台湾和南海海上边界线，中国地区高度分布图(height distribution map in China)

说明：  matching pursuit algrithmic

这个事关于Computer Graphics （计算机图形学）的教学代码！！！(The thing about Computer Graphics (computer graphics) teaching the code! ! !)

首先将非平稳的故障振动信号进行双树复小波包分解，得 到不同频带的分量；然后对每个分量求其峭度值和相关系数并进行比较；最后选取峭度值和相关系数较大的分量 进行软阈值降噪和双树复小波包重构，即可有效地消除振动信号中噪声的干扰，同时保留信号中的有效信息即实 现了故障特征信息的提取。(In view of the above situation, a new fault diagnosis method is proposed based on dual-tree complex wavelet packet transform and threshold de-noising. Firstly, the non-stationary fault signal is decomposed into several different frequency band components through dual-tree complex wavelet packet decomposition. Secondly, Kurtosis and the cross-correlation coefficient of each component are obtained and compared. Due to the kurtosis reflecting the signal variations, if the kurtosis value is bigger, the degree of the change of signal is bigger too. The correlation coefficient can reflect the proximity between the component and the original signal at the same time, the correlation coefficient is bigger, the more similar with the original signal. Finally, the components that have a bigger value are chosen to be de-noised by a soft threshold and reconstructed by dual-tree complex wavelet packet transform. The noise interference was eliminated effectively, and the effective si)

说明：  机载正侧视SAR雷达仿真和成像，使用matlab编写，直接运行可用(Simulation and imaging of airborne forward-looking SAR radar)

说明：  稀疏表示常用matlab代码，可以直接跑(Sparse representation commonly used matlab code, can run directly)

本书主要内容包括：第1章绪论，介绍了信道编码的理论来源和研究背景；第2章线性分组码，阐述了线性分组码的一般原理；第3章概述LDPC码的有关知识；第4章LDPC码校验矩阵构造，详细介绍了LDPC码的构造方式；第5章阐述了 LDPC的各种译码算法，包括本课题组提出的全新译码算法；第6章和第7章分别介绍了LDPC码的两种优化设计和分析方法，即密度进化和EXIT图；第8章介绍了LDPC码在编码调制系统中的应用；第9章介绍了基于LDPC码的链路自适应技术；第10章主要介绍了LDPC码在物理层、应用层联合优化系统中的应用；第11章介绍了LDPC码在图像数字水印系统中的应用。(LDPC code theory and applications)