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[SourceCode指纹识别

Description: 摘要:指纹识别技术在各个领域的应用已经逐渐成熟,本文基于信息论中的互信息,在指纹识别的特征选取和识别提出自己的一些想法。 1 引言 指纹是人终身不变的生理特征之一,因其具有惟一性、稳定性以及方便性等独特的特点,使指纹识别成为现在应用最广泛的生物识别技术。 指纹识别系统处理的流程中,指纹图像预处理是第一个处理环节,我沿用已经成熟的去噪,二值化,滤波,细化,对其进行预处理。 互信息作为最终的识别准则来进行指纹的识别。 2 指纹的预处理 般自动指纹识别系统由图像采集、图像预处理、细节点提取和指纹匹 几部分组成。 首先,指纹要通过指纹采集设备(常见的有光学取像设备、超声波扫描取像设备、晶体传感器,现在广泛使用的是晶体传感器)转化为计算机内的数字图像(一般为灰度图)。由于采集过程中难免因手指或仪器的原因 使图像存在较多的噪声,所以对采集到的图像进行增强和滤波,并进一步二值化、细化。 二值化 指纹图像是将灰度图像变成两个灰度级的图像。它的思想是在指纹增强时设定一定的灰度阈值,图像像素灰度与此阈值比较,大于此值的灰度置灰度最大值 255(白色),小于此值的灰度置0(黑色),从而使图像前景和背景彻底分开。对于指纹图像的二值化要用自适应二值化,即灰度阈值的选取不能是固定的,因为利用Matlab强大的图像处理函数不仅省去很多烦琐的编程,而且其中提供的算法能够达到非常好的效果。 Mattab函数代码为: function I—binarization(a) level— graythresh(a): I— im2bw(a,leve1); 滤波也是用到matlab的工具来实现的。 细化 细化处理是指在二值化的指纹图像上,在不影响纹线连通性的基础上删除纹线的边缘像素,直到纹线为单像素宽为止。采用已有的方法 Introduction to Digital Image Processing with Matlab 数字图像处理概论 [美]Alasdair MchAndrew 著,胡小平 缩编 如下图所示 从左到有一次为;原始图像,滤波图像,二值化图像,细化图像; 3 图像的特征提取与识别 指纹分类可以分为固定类别分类方法和连续分类方法 常见的周定类别分类方法是根据指纹的自然形状将指纹分为5类,或扩展为6~8类,这种分类体系称为Henry分类体系。Henry分类体系中重要的分类特 有指纹的奇异点,包括Core点(核心点)和Delta点(三角点),以及指纹方向场和脊线流等。后一些学者又 提出了一种脊线流分布模型用于指纹/奇类,定义了l0种指纹脊线常见的形状模型,通过分析脊线的形状和分布来确定指纹所在的类别,这类分类算法复杂度高,所以基于信息论的互信息来实现。 假定X是离散的随机变量x是集合,概率密度函数是为了方便我们用P(X)来表示概率密度函数而不用Px(x)。因此P(X)和P(y)则代表两个不同的随机变量并且实际上对应着两个不同的概率密度函数,分别是Px(X)和Py(x) 定义变量X的熵H(X)定义为 , 联合熵: 如果一对离散随机变量的联合密度函数是p(x,y),那么,它们的联合熵H(x,y)可以定义为: 也可以描述为: 互信息: 考虑两个随机变量X和Y,联合概率分布函数为p(x,y),边缘概率分布函数为p(x)和p(y)。互信息I(X,Y)为联合分布和分布乘积p(x)p(y)之间的相对熵。 由于互信息是一个随机变量包含另一个随机变量多少的一个量度,是一个随机变量由另一个随机变量的信息其不确定性的减少,应为指纹简单的可分为3类:簸箕,斗,弧,其主要特征判别由指纹的中心决定,所以提出先由图像中心来比较互信息,达到阈值,在扩大范围进行第二次的比较,在判定是否达到阈值,依此比较,达到最后的识别目的,不过此方法对于不同类型的指纹识别效果不错,对于相同类型的效果不好。 所以用一种方法:运用在图像处理中常用的8邻域编码对图像进行脊线跟踪,完成对真细节特征的有效的提取,提取的特征向量格式{x,y,dim},分别为细节特征点的横坐标、纵坐标和方向。计算方向角;计算频率, Gabor滤波实现; G(X Y @ F0)=EXP(-1/2{X^2/Px^2+Y^2/Py^2})cos(2*pi*F0X) [X Y]=[sin() cos() -cos() sin][x y] 特征的提取 Sum(P(1:n))=1 Sum(P(1:n))=3 实现匹配 取临近10个特征点与当前点记录,若有5个一样则匹配 结果中22%出现错误,其余都实现了识别的效果。 4总结 上述识别方法用互信息的成功不高但相信在以后基于互信息的方法来识别指纹是有可能的。 参考文献 Introduction to Digital Image Processing with Matlab 数字图像处理概论 [美]Alasdair MchAndrew 著,胡小平 缩编 【指纹图像预处理和特征提取算法】“李展丹,徐进”;有具体的实现方法。
Platform: | Size: 422225 | Author: sasigi | Hits:

[Software Engineeringcluster-hyper-dim

Description: This paper studies the problem of categorical data clustering, especially for transactional data characterized by high dimensionality and large volume. Starting from a heuristic method of increasing the height-to-width ratio of the cluster histogram, we develop a novel algorithm – CLOPE, which is very fast and scalable, while being quite effective. We demonstrate the performance of our algorithm on two real world-This paper studies the problem of categori cal data clustering. especially for transactional data characteri propellant by high dimensionality and large volume. St. arting from a heuristic method of increasing th e height-to-width ratio of the cluster histogr am, we develop a novel algorithm-CLOPE. which is very fast and scalable, while being quite effective. We demonstrate th e performance of our algorithm on two real world
Platform: | Size: 108544 | Author: hanzhang | Hits:

[matlabgmm

Description: Creates a Gaussian mixture model with specified architecture.MIX = GMM(DIM, NCENTRES, COVARTYPE) takes the dimension of the space DIM, the number of centres in the mixture model and the type of the mixture model, and returns a data structure MIX.
Platform: | Size: 2048 | Author: 西晃云 | Hits:

[matlabBruteSearch

Description: K-nearest neighbors 搜索 聚类时经常使用的一种方法 国外网站转载- The following utilities are provided: - Nearest neighbor - K-Nearest neighbors - Radius Search They al supports N-dimensions and work on double, it is possible to choose if return the distances. Here is a time comparison with a vectrized m-code: N=1000000 number of reference points Nq=100 number of query points dim=3 dimension of points k=3 number of neighbor tic [idc,dist]=BruteSearchMex(p ,qp , k ,k) MEX toc tic [idc,dist]=knnsearch(qp,p,k) VECTORIZED M-CODE toc p=rand(N,dim) qp=rand(Nq,dim) Output: Elapsed time is 0.962640 seconds. Elapsed time is 18.813100 seconds.
Platform: | Size: 4096 | Author: Ming | Hits:

[matlabonedim

Description: matlab code 3 dim using fimite differance time domain method
Platform: | Size: 5120 | Author: ahmed | Hits:

[assembly languagedim

Description: 这是一个用来计算一条曲线的分维数的程序。-fractal dimensions
Platform: | Size: 1024 | Author: jty | Hits:

[source in ebooks2

Description: it s to reg the img n rotat it to diff dim
Platform: | Size: 1024 | Author: amy | Hits:

[Fractal program1

Description: 应用matlab和盒计数法计算图形的分形维数-FRACTRAL DIM
Platform: | Size: 4096 | Author: liyang | Hits:

[Special Effectslight_matlab

Description: 简单的matlab程序。提供给一种简单地处理图像中光照不匀的方法。图像的特征为中间偏暗,四周亮。-Simple matlab program. Provided to a simple processing of the image illumination unevenness. The characteristics of the image dim middle, surrounded by light.
Platform: | Size: 848896 | Author: 鲁齐 | Hits:

[OtherACKLEY

Description: BENCHMARK PROBLEM FOR GLOBAL OPTIMIZATION ALGORTIRHMS, IMPLEMENTED IN MATLAB DIM, LOW AND UP LIMITS CAN BE FOUND IN RELATED FILE
Platform: | Size: 2048 | Author: INANKAAN | Hits:

[OtherFNNPSOGSA

Description: GSA ALGORITHM AND SOME BENCHMARK PROBLEM FOR GLOBAL OPTIMIZATION ALGORTIRHMS, IMPLEMENTED IN MATLAB DIM, LOW AND UP LIMITS CAN BE FOUND IN RELATED FILE
Platform: | Size: 359424 | Author: INANKAAN | Hits:

[Otherpsopt20130702

Description: PARTICLE SWARM OPTIMIZER AND SOME BENCHMARK PROBLEM FOR GLOBAL OPTIMIZATION ALGORTIRHMS, IMPLEMENTED IN MATLAB DIM, LOW AND UP LIMITS CAN BE FOUND IN RELATED FILE
Platform: | Size: 43008 | Author: INANKAAN | Hits:

[Graph Recognizelicense-plate-recognition-

Description: 这是一个车牌识别程序课程设计,包含完整的源代码和论文,使用matlab实现。通过对车牌图像的预处理,分割、模板比对,识别出车牌号码,效果不错。-试试带有自动翻译功能的新型浏览器。下载 Google Chrome 浏览器关闭翻译中文英语德语检测语言 英语中文(简体)日语 翻译文字或网页 这是一个车牌识别程序课程设计,包含完整的源代码和论文,使用matlab实现。通过对车牌图像的预处理,分割、模板比对,识别出车牌号码,效果不错。 请键入文字或网站地址,或者上传文档。 取消 Zhè shì yīgè chēpái shìbié chéngxù kèchéng shèjì, bāohán wánzhěng de yuán dàimǎ hé lùnwén, shǐyòng matlab shíxiàn. Tōngguò duì chēpái túxiàng de yù chǔlǐ, fēngē, múbǎn bǐ duì, shìbié chū chēpái hàomǎ, xiàoguǒ bùcuò.This is a license plate recognition program curriculum design, including full source code and papers, the use of matlab. By pretreatment on the license plate image segmentation, template matching, to identify the license plate number, good results.
Platform: | Size: 373760 | Author: huisu | Hits:

[Graph Recognizeaffinity-propagation

Description: 这是两个使用matlab实现的AP(affinity propagation)算法,一个是普通的AP算法matlab源代码,一个是用于稀疏数据处理的AP算法matlab实现源代码。-试试带有自动翻译功能的新型浏览器。下载 Google Chrome 浏览器关闭翻译中文英语德语检测语言 英语中文(简体)日语 翻译文字或网页 这是两个使用matlab实现的AP(affinity propagation)算法,一个是普通的AP算法matlab源代码,一个是用于稀疏数据处理的AP算法matlab实现源代码。 请键入文字或网站地址,或者上传文档。 取消 Zhè shì liǎng gè shǐyòng matlab shíxiàn de AP(affinity propagation) suànfǎ, yīgè shì pǔtōng de AP suànfǎ matlab yuán dàimǎ, yīgè shì yòng yú xīshū shùjù chǔlǐ de AP suànfǎ matlab shíxiàn yuán dàimǎ.This is both the use of matlab AP (affinity propagation) algorithm, an ordinary AP algorithm matlab source code, one for AP sparse data processing algorithm matlab source code.
Platform: | Size: 6144 | Author: huisu | Hits:

[AI-NN-PRESNtools

Description: matlab下ESN的工具This software is intended for research use by experienced Matlab users and includes no warranties or services.-In alphabetical order here is what the routines are doing: analogToUnitCoded: - helper function for coding a 1-dim analog signal into a unit-coded signal (aka "local coding") compute_NRMSE: - computes the normalized mean squared error of the esn, given the output of the esn and the actual teacher. compute_statematrix: - runs the input through the ESN. The reservoir (plus input) states of the units are collected in matrix which is returned by the function
Platform: | Size: 67584 | Author: max | Hits:

[Graph Recognizetarget

Description: 基于红外图像的弱小目标检测与跟踪,matlab源代码,非常适用于初学者-Based on infrared image dim target detection and tracking, matlab source code, very suitable for beginners
Platform: | Size: 4096 | Author: 王旭 | Hits:

[matlabadalca-bezier-v0.9-1-gc78b5c9

Description: A matlab package for handling n-dimentional bezier curves. A bezier curve is parametrized by controlPts - which is [N x dim] for N control points of dimension dim
Platform: | Size: 11264 | Author: md adil | Hits:

[matlabstep-fre-one-dim-imaging

Description: 步进频一维成像算法MATLAB实例,从数据生成到成像全过程完整。-Stepped Frequency-dimensional imaging algorithm MATLAB instance, generated the imaging data to complete the whole process.
Platform: | Size: 1024 | Author: wang | Hits:

[Special Effectstongtailvbo

Description: 基于matlab的数字图像处理,频域上进行高通滤波以实现同态滤波,对灰度图像偏暗的图像进行图像增强。-Matlab-based digital image processing, high-pass filter in the frequency domain in order to achieve homomorphic filtering, dim gray image image image enhancement.
Platform: | Size: 27648 | Author: yang | Hits:

[matlabboxcount

Description: matlab program to calculate fractals dim
Platform: | Size: 2048 | Author: cenas | Hits:
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