共查询到10条相似文献,搜索用时 62 毫秒
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Ángel Serrano Isaac Martín de DiegoCristina Conde Enrique Cabello 《Pattern recognition letters》2011,32(15):1998-2008
Gabor filter banks constitute a very robust tool to extract discriminant information from a visual scene. After the now “classical” bank with 5 frequencies and 8 orientations proposed by Lades et al. and Wiskott et al., many other parametrizations of a Gabor filter bank have appeared. In order to find the optimal parametrization for a face recognition experiment, we have performed a 6-way analysis of variance of Gabor parameters using FERET, FRAV2D, FRAV3D, FRGC and XM2VTS face databases, including frontal and turned poses, facial expressions, occlusions and changes of illumination. Considering independent criteria to find the optimal Gabor filter bank, the bank with the highest recognition rate was found to have 6 frequencies and narrower Gaussian widths in the space domain. These results were obtained with Mahalanobis distance for a k-NN classifier, with analytical and holistic Gabor feature vectors. Moreover about 20% of the banks studied here obtained in average a better performance than the classical bank. For most of the databases considered, the highest recognition rates have been achieved with analytical representations (frontal images, images with turns or occlusions), with a holistic preponderance for images with gestures or changes of illumination. The inferiority found for holistic Gabor representations versus their analytical counterparts can be explained for the intrinsic redundancy and the size of the feature vectors of this kind of representation. 相似文献
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Berk Gökberk Author Vitae M. Okan ?rfano?lu Author Vitae Author Vitae Ethem Alpayd?n Author Vitae 《Pattern recognition》2007,40(5):1520-1532
We propose a novel, local feature-based face representation method based on two-stage subset selection where the first stage finds the informative regions and the second stage finds the discriminative features in those locations. The key motivation is to learn the most discriminative regions of a human face and the features in there for person identification, instead of assuming a priori any regions of saliency. We use the subset selection-based formulation and compare three variants of feature selection and genetic algorithms for this purpose. Experiments on frontal face images taken from the FERET dataset confirm the advantage of the proposed approach in terms of high accuracy and significantly reduced dimensionality. 相似文献
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A novel face recognition algorithm based on Gabor texture information is proposed in this paper. Two kinds of strategies to capture it are introduced: Gabor magnitude-based texture representation (GMTR) and Gabor phase-based texture representation (GPTR). Specifically, GMTR is characterized by using the Gamma density (Γ D) to model the Gabor magnitude distribution, while GPTR is characterized by using the generalized Gaussian density (GGD) to model the Gabor phase distribution. The estimated model parameters serve as texture representation. Experiments are performed on Yale, ORL and FERET databases to validate the feasibility of the proposed method. The results show that the proposed GMTR-based and GPTR-based NLDA both significantly outperform the widely used Gabor features-based NLDA and other existing subspace methods. In addition, the feature level fusion of these two kinds of texture representations performs better than them individually. 相似文献
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Claudio A. Perez Author Vitae Leonardo A. Cament Author VitaeAuthor Vitae 《Pattern recognition》2011,44(4):951-963
Face recognition has a wide range of possible applications in surveillance, human computer interfaces and marketing and advertising goods for selected customers according to age and gender. Because of the high classification rate and reduced computational time, one of the best methods for face recognition is based on Gabor jet feature extraction and Borda count classification. In this paper, we propose methodological improvements to increase face recognition rate by selection of Gabor jets using entropy and genetic algorithms. This selection of jets additionally allows faster processing for real-time face recognition. We also propose improvements in the Borda count classification through a weighted Borda count and a threshold to eliminate low score jets from the voting process to increase the face recognition rate. Combinations of Gabor jet selection and Borda count improvements are also proposed. We compare our results with those published in the literature to date and find significant improvements. Our best results on the FERET database are 99.8%, 99.5%, 89.2% and 86.8% recognition rates on the subsets Fb, Fc, Dup1 and Dup2, respectively. Compared to the best results published in the literature, the total number of recognition errors decreased from 163 to 112 (31%). We also tested the proposed method under illumination changes, occlusions with sunglasses and scarves and for small pose variations. Results on two different face databases (AR and Extended Yale B) with significant illumination changes showed over 90% recognition rate. The combination EJS-BTH-BIP reached 98% and 99% recognition rate in images with sunglasses and scarves from the AR database, respectively. The proposed method reached 93.5% recognition on faces with small pose variation of 25° rotation and 98.5% with 15% rotation in the FERET database. 相似文献
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对贝叶斯分类中最大似然(ML)公式进行了简化,给出了一种实用的快速计算相似度的方法,在此基础上设计了基于分块Gabor特征提取的贝叶斯人脸识别算法。该算法从原始数字图像出发,先对图像矩阵进行分块,然后对分块子图像进行多分辨率的Gabor特征提取,对每一个特征块设计一个贝叶斯分类器,通过将这些分类器加权平均,得到最后的决策。在FERET人脸数据库的实验结果验证了该方法的有效性。 相似文献
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基于Gabor滤波器的快速人脸识别算法 总被引:1,自引:0,他引:1
针对传统人脸识别方法中所提取特征维数高、计算量大等缺点,提出一种新的正面人脸识别算法。新算法融合了半边人脸识别方法、Gabor滤波器、基于互信息判据的Gabor特征筛选来进行人脸识别。新算法将人脸图像分为左右两个部分,计算并比较人脸图像左右半边脸的熵,选取熵值较大的半边人脸图像进行Gabor特征提取。利用二值分类器判别单个Gabor特征的分类能力,选取分类能力较强的特征(最具判决力的特征)。再利用互信息判据对Gabor特征进行第二次筛选,以减小特征之间的冗余度。最后利用最近邻判别器来进行人脸识别。实验结果表明,新算法的识别率优于传统半边脸识别方法,识别速度也优于传统的利用Gabor滤波器进行特征提取的方法。 相似文献
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徐东华 《计算机工程与应用》2011,47(23):194-196
为提高Gabor对人脸结构特征和内容信息的保留能力,解决人脸识别中对表情等抗噪性差的缺点,提出一种基于改进Gabor加权分析的人脸识别算法。该方法通过对归一化的人脸进行多尺度Gabor分析,并依据相同滤波窗口参数进行归类合并,最后对该信号进行加权比对得到识别结果。实验证明,该方法很好地兼顾人脸结构特征和内容信息,具有良好的抗噪性和识别率。 相似文献