基于小波分析与KFisher的人脸与虹膜融合和识别

小波变换将样本图像分解为低频分量和高频分量,去除其高频分量,用低频分量来做人脸识别能有效削弱光照的影响;核方法可以将非线性可分的低维样本空间变换为线性可分的高维空间;人脸与虹膜融合包含更多有用的鉴别信息。因此,先用离散小波变换（DWT）分别获取人脸与虹膜的低频分量;然后,核Fisher辨别分析（KFDA）提取人脸与虹膜融合后的KFDA特征;最后,采用最小距离分类器（KNN）完成识别。基于ORL人脸数据库与CASIA虹膜数据库的实验结果表明,该方法实现了人脸与虹膜的特征融合识别,有效地提高了识别率,克服了Fisher算法的＂小样本＂效应,为多生物特征身份识别提供了一种新途径。     

基于二维Fisher线性判别的人脸耳组合识别

针对人脸易受到年龄、表情等影响,提出了脸和耳相结合的组合识别方法。利用二维Fisher线性判别(2DFLD)方法分别进行了脸、耳图像层和特征层的组合识别。在北京科技大学人耳库和ORL人脸库上进行实验,结果表明,图像层组合和特征层组合的识别率分别为97.5%、95.0%,分别比人脸识别提高了12.5%和10.0%,比人耳识别提高了5.0%和2.5%;与同样应用于组合识别的主成分分析(PCA)、二维PCA(2DPCA)比较,也取得了较好识别效果。这说明,多生物特征组合识别是一种有效的识别方法。     

一种基于二代Curvelet和2D Log-Gabor滤波器的多模特征层融合识别方法

针对单模生物特征识别在实际应用中易受干扰、识别率低且无法达到零错误识别的问题,提出一种基于二代Curvelet和2DLog-Gabor滤波器的人脸与虹膜特征层融合识别算法.该方法利用二代曲波变换提取人脸特征,用2DLog-Gabor幅值法提取虹膜特征,通过PCA降维单模特征向量,在特征层进行融合,通过SVM分类识别融合特征向量.在ORL人脸库和CISIA虹膜库构成的多模生物特征库上进行测试.实验结果表明:该算法正确识别率能达到100%,较单模人脸、单模虹膜识别方法的识别率均提高3.33%,为多模生物特征识别提供了一种有效模型.     

基于块双向Fisher线性判别分析人脸识别

为解决二维Fisher线性判别(2DFLD)分析需要较多系数用以表示图像的特征阵、只考虑了图像的列间相关性从而忽略行间相关性以及作为全局特征提取方法可能会失去一些重要的局部特征等问题,提出一种基于块双向二维Fisher线性判别分析(B2DFLD)算法。首先利用块图像获取保持重要局部信息;然后基于行列双向投影,获取提取特征信息;最后计算特征阵的Frobenius距离,并进行分类。在ORL、YALE与FERET人脸数据库上进行了实验,并同传统的8种人脸识别方法比较。实验结果表明,在确定图像块大小、改变训练样本数以及特征维数的前提下,本文方法的最好识别率都高于93.08,平均误识率高于0.15,明显优于其他方法,表明本文方法对有光照、表情以及遮挡的人脸图像识别具有较高的鲁棒性。     

基于机器视觉的人脸生物特征改进识别技术

传统识别方法主要通过谱回归和矩阵完整性约束,从带噪声的原始数据中得到干净的输入数据,达到提高识别人脸生物特征的目的,但忽略了低秩投影矩阵对识别带来的干扰,导致识别精度低、效率差的问题,故提出基于机器视觉的人脸生物特征改进识别技术。通过摄像机代替机器视觉对人脸图像进行采集,构建人脸图像双色反射模型,对人脸图像进行预处理,并以机器视觉为基础,结合局部差分二值模型(LDBP),实现对人脸生物特征识别的改进。实验结果表明,相比于传统识别技术,采用改进识别技术在进行人脸生物特征识别方面的识别精度较高,实用性较强,具有一定的优势。     

基于局部分块特征的快速虹膜身份鉴别算法

提出一种新的虹膜身份鉴别算法.首先将灰度虹膜图像等分为若干个子图像,再将每个子图像等分为若干个子区域,将各点梯度之和最大的子区域中心点坐标作为各子图像的特征,各子图像的特征构成了该虹膜图像的特征矩阵,最后通过特征矩阵在空间上直接对准的方法进行匹配识别.给出了子图像和子区域大小的选择方法,同时给出了在人眼自然张开状态下不受遮挡干扰的可用虹膜区域大小对识别效果的影响.克服了之前人为规定子图像和子区域大小和选取固定可用虹膜区域大小提取局部纹理特征所带来的局限性.实验表明:1)人眼自然张开状态下,在虹膜区域超过50%不受遮挡时即可完成识别;2)算法运行速度快且对采集图像时左右各7°以内的旋转失真具有很强的容错能力.     

视觉传感网络中身份特征自适应识别算法改进

在对视觉传感网络中身份特征进行识别时,容易受到人脸表情、光照条件及遮挡等干扰,降低了身份特征识别精度.提出了一种基于改进最小灰度差树的身份特征自适应识别算法.对待识别图像进行灰度处理后,利用最小灰度差数增强待识别图像的质量;定义基于灰度的代价函数,获取待识别人脸图像和指定人脸图像对应的各灰度对的匹配代价,建立最小灰度差树模型,计算两幅图像相似度后,直接采用最近邻匹配算法获取和视觉传感网络注册图库中最小匹配代价对应的图像身份,将其看作待识别身份,实现视觉传感网络中身份特征自适应识别.仿真实验结果表明,所提算法具有很高的身份识别精度.     

基于分数层融合的多生物特征融合识别

针对多生物信息识别分类问题,提出了一种基于分数层融合的掌纹和虹膜融合识别模型。首先使用1D LogGabor滤波及最小汉明距离匹配实现了虹膜的特征提取和识别匹配,识别准确度达到98.9%;其次利用优化后的SqueezeNet网络模型实现了掌纹的分类识别,其分类准确效率可达99%;最后采用分数层融合方案按掌纹与虹膜比为4:6的权重比进行多生物融合识别,最终实现识别分类准确度为99.75。此外,设定评价指标对掌纹、虹膜以及融合后的识别性能进行了评估,得到该三个识别系统的AUC值分别为0.994875、0.985471、0.999599。实验结果表明,多模态生物特征融合识别有效地提高了系统识别的性能,使其具有更高的识别效率和准确度,在安全性、可靠性和鲁棒性等方面都有所增强。     

基于心电与光电容积脉搏波特征层融合的身份识别方法

针对单模态的心电信号(ECG)或光电容积脉搏波信号(PPG)识别技术中存在的精度不高,未考虑类内相关性等问题,该文提出基于判别相关分析法(DCA)对ECG与PPG组合特征矩阵进行特征层融合以及对K-最近邻(KNN)和支持向量机(SVM)分类器在决策层融合的识别方法.实验结果表明,使用融合特征(ECG-PPG)与融合分类器(KNN-SVM)的方法对23名受试者进行分类识别的准确率可以达到98.2％,识别精度在常规环境下优于单模态识别.为多模生物特征身份识别提供了一种有效模型.     

基于心电与光电容积脉搏波特征层融合的身份识别方法

针对单模态的心电信号(ECG)或光电容积脉搏波信号(PPG)识别技术中存在的精度不高,未考虑类内相关性等问题,该文提出基于判别相关分析法(DCA)对ECG与PPG组合特征矩阵进行特征层融合以及对K-最近邻(KNN)和支持向量机(SVM)分类器在决策层融合的识别方法。实验结果表明,使用融合特征(ECG-PPG)与融合分类器(KNN-SVM)的方法对23名受试者进行分类识别的准确率可以达到98.2%,识别精度在常规环境下优于单模态识别。为多模生物特征身份识别提供了一种有效模型。     

Appearance-based periocular features in the context of face and non-ideal iris recognition

Developing newer approaches to deal with non-ideal scenarios in face and iris biometrics has been a key focus of research in recent years. The same reason motivates the study of the periocular biometrics as its use has a potential of significantly impacting the iris- and face-based recognition. In this paper, we explore the utility of the various appearance features extracted from the periocular region from different perspectives: (i) as an independent biometric modality for human identification, (ii) as a tool that can aid iris recognition in non-ideal situations in the near infra-red (NIR) spectrum, and (iii) as a possible partial face recognition technique in the visible spectrum. We employ a local appearance-based feature representation, where the periocular image is divided into spatially salient patches, appearance features are computed for each patch locally, and the local features are combined to describe the entire image. The images are matched by computing the distance between the corresponding feature representations using various distance metrics. The evaluation of the periocular region-based recognition and comparison to face recognition is performed in the visible spectrum using the FRGC face dataset. For fusion of the periocular and iris modality, we use the MBGC NIR face videos. We demonstrate that in certain non-ideal conditions encountered in our experiments, the periocular biometrics is superior to iris in the NIR spectrum. Furthermore, we also demonstrate that recognition performance of the periocular region images is comparable to that of face in the visible spectrum.     

采用神经网络的多模生物特征人脸及指纹识别

小样本问题是人脸识别系统中的一个常见问题,多模态模型具有很强的泛化能力去解决小样本问题,并且已经成为模式识别中重要的研究领域,但是该模型的低精度及低效率已经成为目前的主要难题。为了解决这个问题,提出了一个高效的基于神经网络的多模生物特征人脸及指纹识别系统,通过选择好的特征提取及识别算法来提供更高效的识别。采用生物特征识别来验证一个人的身份,相对于采用密码或口令大大提高了系统的运行效率和识别精度。     

Markov chain model for multimodal biometric rank fusion

Multimodal biometric aims at increasing reliability of biometric systems through utilizing more than one biometric in decision-making process. An effective fusion scheme is necessary for combining information from various sources. Such information can be integrated at several distinct levels, such as sensor level, feature level, match score level, rank level, and decision level. In this paper, we present a multimodal biometric system utilizing face, iris, and ear biometric features through rank level fusion method using novel Markov chain approach. We first apply fisherimage technique to face and ear image databases for recognition and Hough transform and Hamming distance techniques for iris image recognition. The main contribution is in introducing Markov chain approach for biometric rank aggregation. One of the distinctive features of this method is that it satisfies the Condorcet criterion, which is essential in any fair rank aggregation system. The experimentation shows superiority of the proposed approach to other recently introduced biometric rank aggregation methods. The developed system can be effectively used by security and intelligence services for controlling access to prohibited areas and protecting important national or public information.     

基于最大Gabor相似度的多光谱人脸识别系统

以精准识别不同特征维数以及噪声情况下的多光谱人脸为目标,设计基于最大Gabor相似度的多光谱人脸识别系统.原始可见光光谱图像以及热红外光谱图像分别输入系统的可见光光谱图像处理模块以及热红外光谱图像处理模块,图像处理模块分别提取原始可见光光谱图像以及热红外光谱图像特征并建立特征集,多光谱图像融合模块基于特征集内特征利用双...     

Complex common vector for multimodal biometric recognition

A novel multimodal biometric recognition algorithm based on a complex common vector (CCV) is proposed. The CCV generalises the common vector method for the complex field to perform feature fusion and classification. Theoretical analysis proves that the CCV could produce a unique common vector for every fusion feature in a given class. The iris and the face are used as two distinct biometric modals to test the algorithm. Experimental results show that the proposed algorithm achieves much better performance than other conventional multimodal biometric algorithms.     

Wireless Network Security Based on the Image Address Masking (IAM) Mechanism

A multimodal biometric system is applied to recognize individuals as authentication, identification and verification for claimed identity. Multimodal biometrics increases the security level accuracy, spoof of attacks, noise in collected data, intra-class variations, inter-class variations, non universality etc. In this paper a multi modal biometric algorithm is designed by integrating iris, palm print, face and signature based on encoded discrete wavelet transform for image analysis and authentication. Multi level wavelet based fusion approach is applied, integrated and encoded into single composite image for matching decision. It reduces the memory size, increases the recognition accuracy and ERR using multimodal biometric approach when compared to individual biometric traits. The complexity of fusion and the reconstruction algorithm is suitable for many real time applications.     

Safety in numbers [biometric identification cards and database]

This paper discusses the UK governments plans to build a biometric database of the whole population. It outlines the technology behind biometrics, including face recognition, iris prints, and fingerprints. It explains that biometric representations are soon to be a feature of newly issued passports, perhaps driving licences, and that national ID cards are being put forward as a practical proposition.