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基于图像重构和特征融合的人脸识别方法研究
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摘要
人脸所反映的视觉信息在人与人的交流中有着重要的作用和意义,计算机人脸识别技术就是利用计算机分析人脸图像,从中提取有效的识别信息,用来辨认身份的一门技术,由于其广泛的应用领域,在近四十年里得到了广泛的关注和研究。
     人脸识别技术主要包括两部分内容:特征提取和分类器设计。本文主要从人脸图像的特征提取算法入手,分别提出了几种新的基于图像重构和基于特征融合的人脸识别方法。实验证明本文提出的人脸识别方法能有效的提高人脸识别的准确率,具有一定的理论价值与实用价值。本文的研究工作主要包括以下几个方面:
     1)基于图像重构的人脸识别方法:传统的基于特征子空间的人脸识别方法产生的子空间通常都是由人脸库中的所有训练样本产生的一个通用的子空间,此子空间包含的更多的是所有人脸样本的共性特征,而忽略了人脸的一些个性特征。本文提出了一种基于子空间和图像重构的人脸识别方法,该方法以单个人的训练样本集获取其人脸特征子空间,并将识别图像向每一个特征子空间中进行映射及重构,获得的图像最小重构误差作为判据实现人脸识别。同时,我们引入支持向量机(SVM)分类识别算法,将图像重构误差序列作为提取的图像特征参数进行分类识别,两种方法都取得了较好的实验结果。
     2)基于多特征融合的人脸识别方法:通过对建立在统计学习理论基础上的SVM的研究,分析了SVM用于人脸识别的可行性,提出了基于多特征融合的人脸识别方法。该方法首先对预处理后的人脸图像进行全局特征及局部分量的提取,分别采用离散余弦变换(DCT)提取包含图像大量信息的低频部分特征和奇异值分解(SVD)抽取图像的代数特征作为图像的全局特征,采用非负矩阵分解(NMF)提取图像的局部分量特征,然后将此二类特征进行串接并以独立成份分析(ICA)提取组合特征的独立特征用于支持向量机进行人脸识别。
     3)基于独立特征融合的人脸识别方法:DCT能有效的将高维的人脸图像转换到低维空间并保留图像可识别的大部分信息,适合于图像全局特征的提取,而Gabor小波变换适合于图像的局部特征及分类特征提取,这两种特征被广泛应用于人脸识别。基于这两种方法,我们引入ICA技术以提取图像的独立Gabor特征和独立DCT特征,然后将两者进行有效融合以获取新的独立特征,使其同时具有Gabor特征的局部信息和DCT特征的全局信息,并有效的降低特征向量的维数,去除冗余特征。最后,融合后的独立特征被用于SVM实现人脸分类识别。
     4)基于HMM-SVM混合模型的人脸识别方法:由于HMM具有良好的时间序列建模能力,以及SVM在有限样本的分类方面的优良性能,本文提出了一种基于HMM-SVM混合模型的人脸识别方法。该方法首先将人脸图像以采样窗从上到下进行采样,分别采用DCT和SVD提取各个采样窗图像的特征参数并串接成一维观察向量,然后将每个人的训练图像的观察向量用于训练每个人的HMM模型,识别图像的观察向量用于求出其对应于每个HMM模型的输出概率,最后将输出概率用于SVM进行分类训练及识别测试。
     5)人脸识别原型系统设计:以本文提出的人脸识别方法为基础,实现了人脸识别系统的关键功能模块,架构出自动人脸识别的原型系统,为今后开发产品级的人脸识别系统提供了可行性分析依据以及相应的技术储备。
The visual information of faces play a very important role in human communication. Face recognition technique tries to make the computer have the ability of identifying person by analyzing and extracting features from the face images. Because of its wide applications, the face recognition has been one of the hot research subjects in near four decades.
     A mature face recognition process can be divided into two steps: feature representation and classification. The extraction of image features is one of the fundamental tasks in image recognition. From features extraction angle of view, we proposed some novel methods for face recognition. The computer simulations illustrate these methods enhance the recognition rate effectively and have theoretical and practical values. The main contributions of this thesis include:
     1) Face recognition based on image reconstruction: Traditional subspace-based Face Recognition methods obtain a universal subspace by using all trained images. The subspace mainly represents the commonness of human faces but there are a few sights of the individuality owned by a single person's face. In this paper, based on subspace methods and image reconstruction, we present some novel methods for face recognition. When applied to face recognition, the fundamental difference between the traditional subspace methods and our methods is that we obtain the basis images by using each person's pictures respectively, while the traditional way uses the whole training images of the database. After the step above, we obtained the features which would be employed to reconstruct the images by mapping the test images to the basis images. And then we use two ways for face recognition, the first way is adopting the minimum reconstruction error and the second is employing support vector machine (SVM) by using the reconstruction error vectors. Finally, experiments based on three different databases illustrate the effectivity of these methods.
     2)Face Recognition Based on Features Fusion: Support vector machine (SVM) is a new machine learning method that is established on the statistics learning theories, and in this paper, we propose a novel algorithm for facial recognition based on features fusion in support vector machine (SVM). First, some local features and global features from pre-processed face images are obtained. The global features are obtained by making use of discrete cosine transform (DCT) and singular value decomposition (SVD). At the same time, the local features by utilizing non-negative matrix factorization (NMF) are also obtained. Furthermore, the feature vectors fused by independent component analysis (ICA) with global and local features are given. Finally, the feature vectors are used to train SVM to realize the face recognition, and the computer simulation illustrates the effectivity of this method on the ORL face database.
     3) Independent Features Fusion for Face Recognition: As a holistic feature extraction method, the DCT converts high-dimensional face images into low-dimensional spaces in which more significant facial features are maintained. On the contrary, the Gabor transformed face images exhibit strong characteristics of spatial locality, scale and orientation selectivity, which produce salient local features which are most suitable for face recognition. So, we use Gabor wavelets for the local features and then integrate Gabor features with DCT coefficients. In addition to, because ICA would reduce redundant features and represent more explicitly the independent features which are most useful for subsequent pattern discrimination and associative recall, ICA has been used for extracting their independent features respectively. And then, the independence property of the independent Gabor features and DCT features leads to the application of the support vector machine (SVM) for classification.
     4) Face Recognition Based on HMM-SVM: Because SVM has excellent ability to classify and HMM has good ability to time sequence modeling, we used a mixed model based on HMM and SVM for face recognizing. In this method, a sequence of overlapping sub-images is extracted from each face image by using discrete cosine transform (DCT) and singular value decomposition (SVD). Afterward, the sequence which is extracted from training images is modeled by using HMM, and then, the output probability of each HMM for the training sequence has been considered as the input vector of SVM for its training. In the end, the output probability of each HMM for the testing sequences has been considered as the input vector of SVM for its testing. The computer simulation illustrates the effectivity of this method on the Olivetti research laboratory (ORL) database.
     5) Face recognition prototype system design: Based on these novel algorithms, we discuss the process of face recognition and introduce the function and implementation modules, and then develope the face recognition prototype system. All these results lay a foundation for a business version in the future.
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