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A book for MATLAB beginners

This file contains an introduction to the PSCAD/EMTDC software tools using to simulate the power system in wind power. Good simulation models are provided in this document with real system data.

研究表明，构成K一L变换矩阵的向量也就是ToePhtz矩阵的特征向量。与此同时，离散 余弦变换矩阵逼近于ToePutz矩阵的特征向量矩阵，所以离散余弦变换矩阵与自然图像的 K一L变换矩阵十分相似。经过离散余弦变换后的变换系数块的协方差矩阵Cy非常接近对角 阵，即除了对角线元素以外，其它很多元素都近似为0，并且在左上角集中了主要能量。这 反映了自然图像大部分区域变化不大，亮度突变只占少数，即图像能量以低频成分为主的特 性。通过变换后的量化，舍弃对视觉效果影响较小的次要信息，可达到进一步的压缩效果。 虽然从去相关性能的意义上讲，DCT是一种次于K一L变换的准最佳变换，但是从算法实现的角度来看，DCT则远远优于K一L变换。首先，当图像的分块大小确定后，DCT的变换矩阵也就随之确定了，不随输入信号的统计特性变化而变化 其次，二维DCT能够分解成两次一维DCT，有利于硬件实现。 (Studies have shown that constitute a K L transformation matrix vector is ToePhtz eigenvector of the matrix. At the same time, discrete The cosine transform matrix approximation in ToePutz matrix eigenvector matrix, so the discrete cosine transform matrix and natural images Is very similar to a K L transformation matrix. After discrete cosine transform, the transform coefficient block of Cy is very close to the diagonal of covariance matrix Matrix, namely except diagonal elements, many other elements are approximate to 0, and focused the main energy in the upper left corner. this Reflects the natural images most area changed little, brightness mutations accounted for only a few, the energy is given priority to with low frequency components of image Sex. Through quantitative after transformation, abandoning smaller effect on the visual performance of secondary information, can achieve further compression effect. Although from related to the performance of the sense, DCT is a kind o)

说明：  有关数学建模的源码和教程，对于初学者很有用(The mathematical source code and tutorials, useful for beginners)

数字水印技术是近年来图像保护技术研究领域的一个热点, 本文提出了一种基于小波变换的图像数字 水印嵌入算法的Matlab 实现。实验结果表明, 该算法具有较好的视觉效果和透明性。(Digital watermarking technology in recent years is to protect technology research in the field of image a hot, this paper puts forward a method based on wavelet transform is the digital image Watermark imbedding algorithm Matlab. The experimental results show that the algorithm has good visual effects and transparency. )

Some examples about who use trees and binary trees in Matlab

基于多层感知器的DNA序列分类器的设计,里面有说明文档和源程序(Based on the DNA sequence of MLP classifier design, which has documentation and source code)

Phase Code Modulation function coding

实现高维数据向低维数据的转变，降低维数希望群主采纳！(To realize the change of high dimensional data to low dimensional data, reduce the dimension of hope group of main adopted!)

一个一维地震记录在频率域滤波的示例程序，包含了带通滤波器，并且加斜坡防止吉布斯效应。(A one-dimensional seismic data in the frequency domain filtering the sample program, including a band-pass filter, and add the ramp to prevent Gibbs effect.)