matlab_ch5

用matlab实现算数编码、哈弗曼编码以及LZW编码（能够区分大小写和数字进行编码）含测试文本和结果(Using matlab realize arithmetic coding, Huffman coding and LZW coding (case-sensitive and numbers can be encoded) containing test text and results)

DIRECT SEQUENCE SPREAD SPECTRUM

这个是面部表情自动识别的源代码。它是基于Viola和Jones的面部检测算法和Gabor面部特征点的提取，然后使用训练过的神经网络来识别人脸表情。(This is the automatic recognition of facial expression source code. It is Viola and Jones face detection algorithms and Gabor facial feature point extraction, and then use the trained neural network based on facial expression recognition.)

现代通信系统(matlab版本)第二版，第一章的第一个例题程序.(Modern communication systems (matlab version) second edition, the first chapter of the first Example program.)

A Gibbs Sampling Demo.

对三维shepp-logan数据做三维扇形投影，并根据投影数据重建出shepp-logan图像。(Three-dimensional shepp-logan data do three-dimensional projection fan and shepp-logan reconstructed image from the projection data.)

MATLAB程序设计教程，ppt格式，同时包含有大量程序设计案例源代码(MATLAB programming tutorials, ppt format, also contains a large number of cases the source code programming)

基于FCM的图像分割算法，先对图像平滑，然后利用FCM对像素聚类，实现对图像的分割。(A methord based on FCM for image segmenting,firstly,using filter to smooth the image and the use the rule of FCM clustering pix finshing image segmention)

About correlation. In signal processing, cross-correlation is a measure of similarity of two waveforms as a function of a time-lag applied to one of them. This is also known as a sliding dot product or inner-product. It is commonly used to search a long duration signal for a shorter, known feature. It also has applications in pattern recognition, single particle analysis, electron tomographic averaging, cryptanalysis, and neurophysiology.

一个地震波正演的程序，还在进一步测试中。欢迎大家讨论(Calculates 3d, 2d and 1d finite difference solution to wave equation)