加权自适应CS-LBP与局部判别映射相结合的掌纹识别方法

提取掌纹的最佳低维分类特征一直是掌纹识别研究领域的一个重要方向。针对掌纹图像具有丰富的纹理特征特点,提出一种基于加权自适应中心对称局部二值模式(WACS-LBP)与局部判别映射(LDP)相结合的掌纹识别方法。首先将掌纹感兴趣(ROI)图像分成大小均匀的小区域,利用自适应中心对称局部二值模式(ACS-LBP)算法获取不同区域的纹理特征直方图和权值,经过加权连接得到ROI的加权纹理特征直方图向量;再利用LDP算法对得到的特征向量进行维数约简;最后利用K-最近邻分类器进行掌纹识别。在掌纹公开数据库上进行实验,正确识别率高达97%以上。实验结果表明,该方法不仅是有效、可行的,而且研究思路比较明确。     

基于改进的局部敏感判别分析的步态识别方法

相对于人脸和指纹等广泛使用的生物特征识别手段而言,步态识别是一种相对新的非接触式的身份识别方法。提出了一种基于改进的局部敏感判别分析的步态识别方法。在真实的步态数据库上的实验结果表明,提出的步态识别方法是有效可行的。     

基于核二维主成分分析算法的步态识别

步态识别是一种新的生物认证技术,它是通过人的行走方式来识别人类身份的方法。为了更加快速有效地对人体步态特征进行提取和识别,采用了基于核二维主成分分析（Kernel two Dimensional Principal Component Analyses,K2DPCA）的方法进行步态特征提取,运用支持向量机（SVM）进行步态识别。根据人体步态下肢摆动距离统计出步态周期,得到步态能量图（GEI）,对生成的GEI采用核二维主成分分析方法进行步态特征向量提取,采用SVM分类器进行分类识别。实验结果表明该方法具有很好的识别效果。     

Improved gait recognition through gait energy image partitioning

Recently, human gait pattern has turned into an essential biometric feature to recognize an individual remotely. Gait as a feature becomes challenging owing to variation in appearance under different covariate conditions (eg, shoe, surface, haul, viewpoint and attire). The covariates may alter few fragment of gait while other fragment stay unaltered, leading to lower the probability of correct identification. To overcome such variation, an improved gait recognition strategy is proposed in this article by gait energy image partitioning and selection processing. Our method involves pre-processing of raw video for silhouette extraction, gait cycle detection, segmentation into different regions, and histogram of gradients feature extraction from selected segments. In this way, the specific features across complete gait cycles are extracted precisely. Finally, recognition is done by using K-NN. The proposed strategy has been assessed using the CASIA B gait database. Our outcomes shows a particular proposed strategy accomplishes high recognition rate and outperforms the advanced gait recognition mechanism.     

A study on gait entropy image analysis for clothing invariant human identification

A simple and common human gait may be viewed as a strong biometric cue to solve human identification problem through understanding the intrinsic patterns of gait biometrics. An individual’s gait pattern appears to be different in gallery and probe gait sequences due to wearing dissimilar clothing types. The gait dataset captures the possible changes found in silhouette shape image which provides the difficulty in distinguishing among individuals. In this paper, a robust feature selection technique has been addressed through Gait Entropy Image (GEnI) analysis. The GEnI has the capacity to accumulate most significant motion information. The width of GEnI, along the horizontal axis is taken as discriminative feature which produces a small intra-class variance. This information is studied as an evidence of feature invariance. The standard statistical tests such as pair-wise clothing correlation and intra-clothing variance are performed on gait dataset to evaluate the reliability of feature. Experimental results demonstrate the efficiency of proposed feature selection method using k-nearest neighbor (k-NN), minimum distance classifier (MDC), and support vector machine (SVM) algorithms. The performance analysis of recognition system has been evaluated on OU-ISIR Treadmill B gait database with different error metrics after performing N-fold cross validation method.     

基于加权区域特征的快速步态识别

为提高步态识别率根据不同肢体部位对识别贡献程度的不同,提出一种基于加权区域面积特征的步态识别新算法,将人体轮廓侧影划分为多个可变区域,分别提取每个区域的面积作为步态特征,计算特征向量各元素的贡献度,然后对特征向量进行加权处理,并改进最近邻分类器进行分类,最后在UCSD和CASIA步态数据库上进行充足的实验,实验结果表明了该方法具有较高的识别率。     

基于GVF Snake模型的步态识别轮廓提取

步态识别作为一种新的生物识别技术,通过人走路的姿势实现对个人身份的识别和认证。步态特征提取是步态识别的关键步骤。采用背景消减法与对称差分法相结合对运动人体分割,采用改进的GVF Snake模型对人体运动步态轮廓进行边缘提取。实验结果表明该方法能准确高效地提取边缘特征作为步态识别的特征。     

对步态空时数据的连续特征子空间分析

提出一种基于空时特征提取的人体步态识别算法。连续的特征子空间学习依次提取出步态的时间与空间特征：第一次特征子空间学习对步态的频域数据进行主成分分析,步态数据被转化为周期特征矢量;第二次特征子空间学习对步态数据的周期特征矢量形式进行主成分分析加线性判别分析的联合分析,步态数据被进一步转化为步态特征矢量。步态特征矢量同时包含运动的周期特征以及人体的形态特征,具有很强的识别能力。在USF步态数据库上的实验结果显示,该算法识别率较其他同类算法有明显提升。     

Gait recognition based on joint distribution of motion angles

Gait as a biometric trait has the ability to be recognized in remote monitoring. In this article, a method based on joint distribution of motion angles is proposed for gait recognition. The new feature of the motion angles of lower limbs is defined and extracted from either 2D video database or 3D motion capture database, and the corresponding angles of right leg and left leg are joined together to work out the joint distribution spectrums. Based on the joint distribution of these angles, we build a feature histogram individually. In the stage of distance measurement, three types of distance vector are defined and utilized to measure the similarity between the histograms, and then a classifier is built to implement the classification. Experiments has been carried out both on CASIA Gait Database and CMU motion capture database, which show that our method can achieve a good recognition performance.     

基于智能手机运动传感器的步态特征身份识别方法

利用行为特征进行身份验证是生物识别的前沿技术。为优化基于步态特征的身份识别研究中对数据的处理并改进识别的方式，提出利用智能手机运动传感器数据提取步态特征用于身份识别的方法。首先，应用空间转换算法解决传感器坐标系漂移问题，使数据可以完整准确地刻画行为特征；然后，利用支持向量机（SVM）算法对用户切换所导致的步态特征变化进行分类识别。实验结果表明，经过欧拉角法处理后，所提方法识别准确率达到95.5%，在有效识别用户变换的同时降低了空间开销和实现难度。     

基于HMM的步态身份识别

随着生物识别悄然兴起,生物识别技术逐渐成为新的身份识别技术。步态识别是生物特征识别技术的一个新兴子领域。文章就是将隐马尔可夫模型(HMM,HiddenMarkovModel)方法运用在步态身份识别中,并进行了其识别性能的研究。该文给出了一个基于HMM的步态身份识别方案,并进行了图像预处理,HMM参数训练和识别的研究,得出了一些有意义的结论。同时在中国科学院自动化研究所提供的CASIA步态数据库上进行了步态身份识别实验,实验结果表明:在侧面视角下采用此方法,具有较好的识别率。     

煤矿入井人员唯一性检测技术研究

通过分析掌纹、指纹、虹膜、人脸、步态、声纹等生物特征识别技术的特点以及煤矿现场对入井人员生物特征的影响,指出虹膜识别、人脸识别、步态识别、声纹识别适用于煤矿入井人员唯一性检测;提出了一种基于人员定位和生物特征识别的煤矿入井人员唯一性检测技术方案,将生物特征识别技术嵌入人员定位系统,利用人员定位识别卡实现识别卡数量及人员身份的唯一性检测;指出煤矿入井人员唯一性检测技术的研究关键点是严重污染人脸的识别算法、对设备遮挡情况下人员步态图像的采集及对混入人员语音信号的煤矿现场噪声消除算法。     

一种基于局部描述符的三维人脸识别方法

提出一种局部描述符进行三维人脸识别。每个采样点的局部特征定义为该点根据其法向量与3个主轴之间的角度自适应选取的邻域点集向人脸主轴平面投影所得的面积。文中提出的三维人脸识别算法首先对人脸进行预处理,归一化到较统一的姿态后,提取与鼻尖等距的轮廓线,并对轮廓线进行重采样以剔除无用点。然后对每个采样点提取局部特征。最后建立人脸之间的点对应关系,将加权融合后的局部特征用于识别。通过实验认证,文中方法识别效果较好,且对遮挡和噪声有较好的鲁棒性。     

Gait recognition using multi-bipolarized contour vector

Gait recognition has recently attracted increasing interest from the biometric community. In this paper, we propose a simple yet powerful new feature called multi-bipolarized contour vector (MBCV) for gait recognition. The proposed MBCV feature consists of four components: (1) the Vertical Positive Contour Vector, (2) the Vertical Negative Contour Vector, (3) the Horizontal Positive Contour Vector, and (4) the Horizontal Negative Contour Vector. We furthermore develop a gait recognition system based on the proposed MBCV feature. The system consists of three steps: image preprocessing including background subtraction and silhouette normalization, extraction of the MBCV feature, and classification. To reduce the dimensionality of MBCV, we use principal component analysis (PCA). To solve the classification problem, we use the Euclidean distance and a nearest neighbor (NN) approach. Finally, we fuse the proposed gait features at all levels to improve recognition performance. The proposed recognition system is applied to the well-known NLPR gait database and its effectiveness is demonstrated via comparison with previous works.     

基于非对称双路识别网络的步态识别方法

步态作为一种人体躯干、关节、上下肢及各肌群的周期性行为模式,是可用于身份识别过程的一种重要生物特征.针对现有的步态识别方法大都是基于步态轮廓图或者步态能量图提取的全局特征,而忽视了对细粒度步态信息的有效利用的问题,提出了一种包括全局通路和局部通路的非对称双路识别网络.其中全局通路采用三元组损失函数,用于提取步态的全局时...     

多特征融合的金属断口图像分类

为了进一步加强金属断口图像特征的鉴别能力,提高断口图像的识别率,提出基于全局与局部纹理特征的多特征融合算法.首先利用Trace变换提取图像全局纹理特征,局部二值模式提取图像局部纹理特征.然后采用动态加权鉴别能量分析对2种特征进行优选和自适应加权融合.最后采用支持向量机进行分类识别.在金属断口图像库上实验表明,文中方法识别率较高,在其它的纹理数据库上具有较好的泛化能力.     

A probabilistic image-weighting scheme for robust silhouette-based gait recognition

Many gait recognition methods use silhouettes as a feature due to their simplicity and effectiveness. However, silhouette-based gait recognition algorithms have the drawback of performance degradation when the silhouette images are corrupted. To solve this problem, this paper proposes a new gait representation method by emphasizing the noise-free silhouettes while suppressing the corrupted ones. The probabilistic support vector machine (PSVM) is employed to weigh the silhouette images according to quality and to construct a new gait representation for robust recognition. Experiments are conducted with the CASIA and SOTON databases, and the proposed method makes silhouette-based gait recognition as reliable biometrics.     

基于连续密度隐马尔可夫模型的人体步态识别*

人体步态识别作为一种远距离和非侵犯性的识别技术在视频监控等领域具有广泛的应用前景.基于此原因,文中提出基于连续密度隐马尔可夫模型(CD-HMM)的人体步态识别算法.首先,提出基于自然步态周期的特征提取算法,并在此基础上构造观测向量集.然后,使用从训练样本集中提取的步态向量集对CD-HMM进行参数估计.最后,提出基于Cox回归分析的渐进自适应算法对训练过的步态模型进行参数自适应和步态识别.实验表明,相比现有的其它步态识别算法,文中算法具有更高的识别率.     

基于深度学习的虹膜人脸多特征融合识别

传统多生物特征融合识别方法中人工设计特征提取存在盲目性和差异性,特征融合存在空间不匹配或维度过高等问题,为此提出一种基于深度学习的多生物特征融合识别方法。通过卷积神经网络(convolutional neural networks,CNN)提取人脸和虹膜特征、参数化t-SNE算法特征降维和支持向量机(support vector machine,SVM)分类组合进行融合识别。实验结果表明,该融合识别方法与单一生物特征识别以及其它融合识别方法相比,鲁棒性增强,识别性能提升明显。