treestep

经典的香农采样定理认为,为了不失真地恢复模拟信号,采样频率应该不小于奈奎斯特频率(即模拟信号 频谱中的最高频率)的两倍.但是其中除了利用到信号是有限带宽的假设外,没利用任何的其它先验信息.采集到 的数据存在很大程度的冗余.Donoho等人提出的压缩感知方法(Compressed Sensing或Compressive Sampling, CS)充分运用了大部分信号在预知的一组基上可以稀疏表示这一先验信息,利用随机投影实现了在远低于奈奎斯 特频率的采样频率下对压缩数据的直接采集.该方法不仅为降低采样频率提供了一种新思路,也为其它科学领域 的研究提供了新的契机.该文综述性地阐述了压缩感知方法的基本原理,给出了其中的一些约束问题和估计方法, 并介绍压缩感知理论的相关问题———矩阵填充,最后讨论了其未来可能的应用前景. (According to the conventional Shannon s sampling theorem,in order to represent the analog signal,the sampling rate should not be less than twice the Nyquist sampling rate.Howev- er,this theorem only makes use of the bandwidth information.As a result,the collected data contain many redundant information.The recently proposed sampling method,compressed sens- ing or compressive sampling(CS),can collect compressed data at the sampling rate much lower than that needed in Shannon s sampling theorem by exploring the compressibility of the signal. This paper presents a review on the basic theory of CS.Some of the restrictions and recovery methods in CS are also discussed.Finally,some potential applications based on CS are presented. )

鱼眼透镜影像之变形校正。详细介绍了鱼眼图像畸变产生原理，校正方法。给出了MATLAB校正源代码。(Image of fisheye lens distortion correction. Details of the fish-eye image distortion resulting theory, calibration methods. MATLAB gives the correct source code.)

skin segmentation in matlab environment

输入字母和目标矢量产生程序，matlab编程(Enter the letters and the target vector generation process, matlab programming)

说明：  用matlab实现的区域生长算法,易懂，对于初学者很有参考价值(the regiongrowing algorithm using MATLAB)

由matlab编写，能实现局部优化的功能(it is writed by matlab，can solve optimization problems)

实现雷达信号线性调频的相关处理，对雷达信号的细微特增进行分析(Chirp radar signal processing, radar signal subtle increase in special analysis)

Defined simulation of tanker with PD controller implementation using matlab

fdtd program 2D using PML (Perfect Match Layer)

信号处理，振动方面的，很有用，绝不后悔，帮助很大(Signal processing, vibration issues, useful, never regret, very helpful)