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1.
为了提高掌纹识别中对局部区域特征的提取及掌纹识别率,提出一种基于多级区域局部二值模式(MBLBP)和Gabor小波的掌纹识别算法。通过对光照及感兴趣区域(ROI)等因素进行预处理,经过Gabor小波变换后提取掌纹的多尺度特征,再利用MBLBP算法提取主元,采用欧式距离分类法计算掌纹识别率。经过香港理工大学掌纹库(PolyU)验证,比较不同预处理、不同算法下的掌纹识别率。实验证明,该方法相比于以往的局部二值算法(LBP)在识别率上有较大提升。  相似文献   

2.
用计算机对大鱼际掌纹图像进行处理,首先要从整个手掌图像中截取出大鱼际区域.大鱼际掌纹区域的定位分割是实现大鱼际掌纹客观量化识别的关键步骤,针对所要截取区域的特殊性,提出一套适合提取大鱼际掌纹区域的方法.  相似文献   

3.
掌纹识别是利用人的手掌掌纹图像对其身份进行认证的一种生物特征识别技术,有着巨大的发展潜力。掌纹线中的主线和皱褶是重要的特征,在空间域内掌纹图像中纹理的疏密和深浅,与频域内能量聚集和紧密程度相关。目前的掌纹研究主要集中在就一种掌纹特征的提取算法上如何提高匹配率,而对结合两种以及两种以上的掌纹特征的提取算法,如何提高掌纹识别匹配率的讨论较少。提出了一种有效提高掌纹识别率的方法,即结合点特征的提取和傅立叶变换特征的提取,提高掌纹特征匹配识别率。将该方法与单独使用点特征提取和傅立叶变换提取进行了比较实验,实验结果证明新方法的识别率有明显提高。  相似文献   

4.
掌纹识别一般的预处理过程,是通过图像二值化、边缘检测、子图截取等步骤,获取掌纹感兴趣区域(RIO),截取掌纹子图。给出一种基于最大内切圆的子图截取算法,并对该算法进行优化,通过平移和旋转校正,得到掌纹RIO区域子图。  相似文献   

5.
物体的特征以及图像的细节仅在某一尺度范围内存在。这就需要我们针对不同的物理现象建立不同尺度的模型。在不同的应用背景中,图像的光滑程度是不同的,它们是经过不同程度的图像光滑而得到的。将这些图像光滑变换有机地组合起来,就形成了一个抽象框架——尺度空间。为了更好的进行图像预处理,人们通常将原始图像进行多尺度表达,即将原始图像嵌入一单参数导出的图像族中,此操作也被叫做图像的多尺度分析。  相似文献   

6.
研究了高分辨率掌纹图像的分割方法问题,将均值、标准差作为标准,实现了由纹线组成的掌纹图像的前景分割。对于手指部分的干扰,将其分为孤立的手指部分和与手掌相连的手指部分分别进行处理,利用区域生长法提取最大连通域达到去除孤立手指部分的目的;利用轮廓跟踪法比较CD、PD距离,定位与手掌相连的手指部分的位置,从而实现将其去除的目标。实验结果表明,该方法很好地实现了高分辨率掌纹图像的分割,为后续的特征提取工作奠定了基础。  相似文献   

7.
在掌纹采集过程中,由于受光照噪声的影响,以及手掌的弓形常常给掌纹采集带来噪声.基于此,提出小波变换子带杂交的一种新颖掌纹识别算法.该算法综合考虑小波同层各子带及相邻层子带分解系数的噪声特点,采用基于掌纹图像空间能量加权,再由二维主元分析(Two-dimensional Principle component Analysis,2DPCA)算法降维、去相关,最终由最小距离分类器完成掌纹识别.基于香港理工大学公布的PolyU掌纹数据库的实验,此算法正确识别率达到100%.同2DPCA算法相比,提出的算法不仅正确识别率较高,识别效率也较高.  相似文献   

8.
小波模极大值是在对多尺度小波变换进行不规则抽样的基础上得到的,可以用来描述信号的奇异性.提出了一种小波模极大值结合多尺度不变矩法的图像检索算法,该算法对图像进行小波变换求得多尺度下的模图像,求出所有尺度下的局部极大值及其位置,并对得到的目标边缘进行细化;采用欧氏距离来度量图像的相似性,实现图像的准确检索.同时,设计开发...  相似文献   

9.
在Chen和Chang提出的零水印算法基础上,结合人眼的视觉感知特征与图像综合特征,提出了一种基于图像综合特征的零水印算法。本算法利用均值法得到原图像的低尺度近似图像,根据人眼视觉系统(HVS)的感知特性获取低尺度近似图像的综合特征。通过对比Chen、Chang和本文算法在不同类型信号处理攻击下的性能,得出本文算法在各种信号处理攻击下具有良好的鲁棒性,并通过仿真实验结果验证了本文算法的性能。  相似文献   

10.
提出一种基于NSCT的图像自适应降噪增强算法,对显微镜下获得的离焦图像进行图像恢复预处理.微纳米尺度光学显微镜下采集的离焦图像,通常细节、边缘和轮廓都不清晰,会影响到后续观测任务的精确度.NSCT变换由于多尺度和多方向性,拥有优越的变换功能,可以获得图像更多的纹理和边缘.结合微纳米尺度光学离焦图像的特点,对所有子带进行NSCT逆变换重新构建图像.最后通过对标准500 nm尺度栅格、导电探针和三角探针的实验结果表明,使用本文算法的图像效果更好,有效改善了离焦图像的质量.  相似文献   

11.
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity.  相似文献   

12.
风的曲线     
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.  相似文献   

13.
Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F.  相似文献   

14.
汉字倒说     
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。  相似文献   

15.
《海外英语》2007,(5):44-45
It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,  相似文献   

16.
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language.  相似文献   

17.
钱生钱!     
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了  相似文献   

18.
《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.  相似文献   

19.
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex.  相似文献   

20.
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