bag_words_demo

一维的有限差分源代码，，matlab，简单易学，方面使用，有限差分的优点就是计算简便高效(One-dimensional finite difference code)

一维分形维数的计算，计盒数，看着好才发上来的(One-dimensional calculation of the fractal dimension, box-counting the number was made up to look good)

To understand the traffic mechanism and find optimal strategies to improve traffic capacity is one of the important issues we have to address.

Matlab source code for DCT-based watermarking for grayscale images. DCT-based watermark recovering without resorting to the uncorrupted original image. Digital watermarking has been proposed as a viable solution to the need of copyright protection and authentication of multimedia data in a networked environment, since it makes possible to identify the author, owner, distributor or authorized consumer of a document. A new watermarking technique to add a code to digital images is presented: the method operates in the frequency domain embedding a pseudo-random sequence of real numbers in a selected set of DCT coefficients. Watermark casting is performed by exploiting the masking characteristics of the Human Visual System, to ensure watermark invisibility. The embedded sequence is extracted without resorting to the original image, so that the proposed technique represents a major improvement to methods relying on the comparison between the watermarked and original images.

一个matlab小程序，自己看吧。有没有20字啊(Matlab applet, see for yourself. 20 words)

dct matlab watermarking

提高数据传输效率，降低误码率是信道编码的任务。信道编码的本质是增加通信的可靠性。但信道编码会使有用的信息数据传输减少，信道编码的过程是在源数据码流中加插一些码元，从而达到在接收端进行判错和纠错的目的(Improve the efficiency of data transmission, reduce the bit error rate is the channel coding task. The essence of channel coding is to increase the reliability of communication. But the channel coding can make data transmission of useful information is reduced, the channel coding process is to add some symbols in the source data stream, so as to achieve the purpose of erroneous judgment and correction at the receiver)

函数的界面函数和一些控件的函数的使用等等，帮助用户使用matlab并很方便的理解(Function of the interface functions and the use of some of the control functions, etc., and to help users easily understand the matlab)

WSNs的LEACH路由算法，它是一种层次型算法，核心思想是分簇，并轮流当选簇头！(WSNs LEACH routing algorithm, which is a hierarchical algorithm, the core idea is clustering, and turns elected cluster head!)

标准矩形阵列的波束方向图切面的极坐标图，均匀加权：（a）phai=0度或90度；（b）phai=45度。(Polar plot of uniformly weighted rectangular array)