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多姿态人脸检测与表情识别关键技术研究
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摘要
在人工智能技术研究领域,人脸作为一种重要的生物特征,其检测、识别和表情提取是实现机器智能化的前提和关键技术之一,具有广阔的应用前景,逐渐成为一个活跃的研究分支。
     随着图像处理和模式识别技术的进步,人脸信息处理技术获得长足发展,但仍存在很多需要深入研究的问题。例如:姿态、表情、年龄、遮挡、光照等因素依然严重影响人脸检测与识别的效果,表情识别的研究仍处于起步阶段,理论和方法仍有待完善。本文主要是对多姿态人脸检测、人脸表情特征提取与降维、表情分类与表情识别应用等问题进行了深入研究,研究内容与创新性工作主要如下:
     1、提出了融合特征和图像方法,解决多姿态人脸检测这一实际应用中亟待解决的难题。算法首先利用人脸特征快速确定人脸方向,分割出大致正向的人脸候选区域,从而避免增加姿态检测器而增大算法的复杂度,克服了基于图像方法对多姿态人脸检测率低的缺点。分别运用AdaBoost、SVM和RVM三种基于图像的方法对人脸候选区域进行分类检测。实验表明,融合特征和图像方法进行多姿态人脸检测,可明显提高检测速度和检测率。
     2、通过分析RVM的稀疏性和泛化性能等优于SVM,将RVM用于人脸检测作了有益的尝试。在基于人脸特征方法的基础上,分别采用AdaBoost、SVM和RVM进行多姿态人脸检测,对比研究表明,AdaBoost的检测速度比SVM和RVM快,检测率略低,SVM和RVM的光照鲁棒性比AdaBoost强,RVM的检测效果优于SVM,在光照变化较大的环境下,利用RVM进行人脸检测不惜为一种好方法。
     3、针对AdaBoost、SVM、RVM等基于图像的人脸检测方法对样本依赖较强的问题,为了提高样本有效性,取样本长宽比为1.2,重点突出人脸中央纹理较中的部分。特别是在SVM、RVM算法中,提出了采用彩色样本的新方法,并在YC b Cr彩色空间中,有区别地选取各色彩分量的DCT系数作为特征向量,用于分类器的训练。实验表明,该方法增强了样本有效性,这样可提高算法对光照的鲁棒性和检测率。
     4、分析了基于Gabor变换的人脸表情特征提取方法,针对Gabor特征向量维数过高和传统特征降维方法的不足,提出了对主要表情区域进行局部Gabor表情特征提取,根据各表情子区域对表情识别贡献不同,采用非均匀采样,提取出既能反映表情变化,又利于表情分类的表情特征,以达到有效的降维。最后,运用DWT和DCT对表情特征做进一步降维,较好地解决了特征提取与降维的问题。
     5、对多分类SVM和RVM进行了深入的研究,针对传统的一对一、一对余等多分类方法的不足,提出了基于二对二多分类SVM与RVM的表情分类方法。该方法以四类别分类问题为研究基础,根据每个子分类器的输出结果进行判断,以相对较少的子分类器组合实现快速分类,从而减少了分类误差。在决策根节点,采用近似最优方法将多类别样本分成两组,并使其聚类中心距离最大,且每组样本数据分歧最小。根据六种基本表情识别率不同,设计出较为合理的决策方案,减小误差的累积,获取最优的分类性能。实验表明,该方法明显缩减了训练和测试时间,提高了分类性能。另外,RVM分类性能略优于SVM。
     6、研究了基于人脸识别的身份认证系统的活体检测技术,及其在提高系统的防欺骗性能的优缺点。根据当前人脸表情识别在与人相关时识别率高,与人无关时识别率低的特点,提出了通过访问人员能够接受又容易做到的4种基本人脸表情进行识别,在保证系统运行速度和较低的错误接受率的基础上,实现活体检测,有效提高了基于人脸识别身份认证系统的防欺骗性能。
In the field of artificial intelligence research, face is an important biological characteristic. Face detection, face recognition and facial expression recognition, which are the prerequisite of achieving machine intelligence and one of the key technologies of machine intelligence and have broad application prospects, are becoming an active research branch.
     With the development of image processing and pattern recognition technology, face process technology has got rapid progress. However, there are still many problems for further research. For example, pose, facial expression, age, occlusion, illumination and other factors still heavily influence the effect of face detection and recognition. Facial expression recognition research is still in its infancy, so the theory and method remains to be improved. In this paper, some issues, such as multi-pose face detection, facial expression feature extraction and dimension reduction, facial expression classification and facial expression recognition applications and others have been deeply studied. The main study contents and innovative work are shown as follows:
     1. A method based on combining facial features and image-based method is proposed to solve multi-pose face detection problem which is urgent in practical applications. Firstly, face direction is quickly determined based on facial features, then the approximate frontal face candidates are segmented. Thus reduced the algorithm complexity caused by excessive posture detector. Moreover, overcome the disadvantage of low detection rate of multi-pose face detection in image-based method. Three image-based methods, AdaBoost, SVM and RVM, are used to classify the face candidate regions. The experimental results show that combining facial features and image-based method in multi-pose face detection can significantly improve the detection speed and detection rate.
     2. By analyzing the RVM's sparsity and generalization performance are better than SVM's. The RVM is applied for face detection in this paper and have got some useful experience. Based on facial feature method, the comparative study is made on AdaBoost, SVM and RVM used for multi-pose face detection. Experiments show that AdaBoost is faster than SVM and RVM but slightly lower detection rate. SVM and RVM have strong illumination robust than AdaBoost. RVM used for face detection is regarded as a good method in the large illumination change environment.
     3. For AdaBoost, SVM, RVM and other image-based face detection methods rely stronger on the issue of the sample, the effectiveness of the sample can be improved by the sample aspect ratio of 1.2, which the face center rich texture information is focused. Especially in SVM and RVM algorithm, a new method using color samples is proposed. In the YC b Cr color space, the DCT coefficients of the color component are differently selected and are regarded as the feature vectors for classifier training. Experiments show that the method enhances the effectiveness of the sample, so that it can improve the robustness and the detection rate in different lighting conditions.
     4. By analyzing the facial expression feature extraction methods based on Gabor transformation, as the high dimension of Gabor feature vector and the inadequate of traditional dimensional reduction methods, local Gabor feature extraction method is proposed in major expression regions. For different expression sub-regions have the different contribution to facial expression recognition, inhomogeneous sampling is adopted. the expression changes can be effectively reflected and the expression classification can be easily done by the expression features. And effective dimension reduction can be achieved. Finally, DWT and DCT are used for further dimension reduction, and the feature extraction and dimensionality reduction problem are well resolved.
     5. After an in-depth study of the multi-classification SVM and RVM, the expression classification method based on two-against-two SVM or RVM are proposed for the defects of the traditional classification methods based on one-against-one, one-against-the rest and so on. Based on the research of four-category classification method, the two-against-two classification method judges the results according to output of each classifier. It realizes fast classification with a relatively small sub-classifier combination, reducing the classification error. Using approximately optimal approach, multi-class samples are divided into two groups in the decision root node, and the maximum distance of cluster center and the minimal differences of sample data can gained in the same group data. According to the different recognition rate of six basic facial expressions, a more rational decision scheme is designed to reduce the accumulation of error and obtain the best classification performance. Experiments show that the multi-classification method based on two-against-two can obviously reduce the training and testing time and improve the classification performance. Additionally, RVM classification performance is better than SVM.
     6. A study of the vivo detection technology, which is used in the identification system based face recognition, and the advantages and disadvantages of using it to improve anti-cheat for system, have been done. The existing facial expression recognition rate is high in case of person-dependent and is low in case of person-independent. Based four basic facial expressions which the visitor can accept and easily to do, the expression recognition method is proposed to realize vivo detection. It can ensure the system speed and low false acceptance rate, and improve the anti-cheat performance for the identification system which is based on face recognition.
引文
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