LDPCcodeanddecode

example of matlab,optimization method which is used with different model.it will be useful for whom they want to learn Matlab by themselves2

说明：  matlab数值编程使得数值计算工作量大大减轻，但是由于它其实是一种解释语言，而且没有国际标准，另外也没法在没有安装matlab的计算机上运行，不能用于计算密集型应用场合，极大地限制了它地应用，主要应用于物理，数学和化学，部分工程应用领域的计算工作量小的科技工作者。计算工作量大的工作，如流体力学求解，虽然matlab有解偏微分方程组的方法，但那几乎是用来作为例子来说明的，换句话说，只能作为上课例子。大型流体力学计算是计算密集型的一个例子，需要高效运算程序或并行化处理。 (chao liu ji suan)

The fusion of high-spectral/low-spatial resolution multispectral and low-spectral/high-spatial resolution panchromatic satellite images is a very useful technique in various applications of remote sensing. Recently, some studies showed that a wavelet-based image fusion method provides high quality spectral content in fused images. However, most wavelet-based methods yield fused results with spatial resolution that is less than that obtained via the Brovey, IHS, and PCA fusion methods. In this paper, we introduce a new method based on a curvelet transform, which represents edges better than wavelets. Since edges play a fundamental role in image representation, one effective means to enhance spatial resolution is to enhance the edges. The curvelet-based image fusion method provides richer information in the spatial and spectral domains simultaneously. We performed Landsat ETM+ image fusion and found that the proposed method provides optimum fusion results.

读取多种书写格式的xml文件，对采用matlab读取xml文件的功能的完善(this code can read XML files in various writing formats.)

一个可以直接应用于扩频系统的m序列仿真，m序列具有很好的自相关性，是在扩频系统中应用最广的伪随机码，本程序可以直接在matlab上运行，对于扩频系统的学习有很大帮助。(Can be directly applied to a m-sequence spread spectrum system simulation, m sequences with good autocorrelation in the spread spectrum system, the most widely used pseudo-random code, the program can be run directly in matlab for Spread Spectrum Systems of great help in learning.)

迭代法是解线性代数方程组的另一类方法，特别适用于解大型稀疏线性方程组。它的基本思想是针对求解问题预先设计好某种迭代格式，从而产生求解问题的近似解迭代序列，在迭代序列收敛于精确解的情况下，按精度要求取某个迭代值作为问题解的近似值。迭代法具有原始系数举证始终不变，算法简单，编写程序较方便，所需存储单元较少的优点。(iterative method was the linear algebraic equations of the other methods, particularly applicable to the large sparse linear equations. The basic idea is to solve the problem in advance against the design iteration some good format, thereby creating problems for the approximate solution of iterative sequence, the iterative sequence converges to the exact solution, precision demanded by a certain value as a question iterative solution approximation. Iteration with the original proof coefficient remains unchanged, the algorithm is simple, the preparation process more convenient, less required storage unit advantages.)

proces matlab proces matlab proces matlab

信号与系统matlab作业2，Discrete Fourier Transform，Filtering of Noisy Signals(Discrete Fourier Transform，Filtering of Noisy Signals)

Uppal is a prototype verification tool to maodel and verify prototype

segments image F by using a split-and-merge approach based on quadtree decomposition. MINDIM (a positive integer power of 2) specifies the minimum dimension of the quadtree regions (subimages) allowed. If necessary, the program pads the input image with zeros to the nearest square size that is an integer power of 2. This guarantees that the algorithm used in the quadtree decomposition will be able to split the image down to blocks of size 1-by-1. The result is cropped back to the original size of the input image.