人脸检测方法的研究

目前人脸识别技术已广泛应用于政府、军队、银行、杜会福利保障、电子商务、安全防务等领域,而人脸检测是人脸识别系统中需要解决的一个关键问题,由于人脸模式的多样性和复杂性,导致大量不同的人脸检测方法,总结了人脸检测中遇到的关键问题与难点,并对各种人脸检测方法进行整理归纳,从基于特征的方法和基于图像的方法两个角度介绍了相关算法...     

基于深度学习的煤矿井下低光照人脸检测方法

煤矿井下光线昏暗、人工光源干扰等造成监控系统采集到的人脸图像对比度低、人脸特征模糊,传统人脸检测算法应用于煤矿井下时会出现误检、漏检。针对上述问题,提出了一种基于深度学习的煤矿井下低光照人脸检测方法。采用基于无监督学习的生成对抗网络（GAN）对煤矿井下低光照图像进行对比度增强,使用自调整注意力引导的U-Net作为生成器,利用双判别器对全局和局部信息进行引导,并使用自特征保留损失函数来指导训练过程和维护图像中人脸的纹理结构,强化人脸特征,避免出现曝光、人脸细节信息丢失等现象,得到较为清晰的人脸图像;利用RetinaFace人脸检测框架对增强后的人脸特征进行检测,其采用特征金字塔结构和单阶段检测模式对人脸图像进行检测,在基本不增加计算量的同时,提高对小尺度人脸检测的能力。在公开低光照人脸数据集DARK FACE和自建煤矿井下人脸数据集上的实验结果表明,该方法提高了图像对比度,清晰地恢复了图像中的人脸特征,在准确率、召回率、平均精度方面均表现较好,有效提高了煤矿井下人脸检测精度。     

基于嵌入式Linux的复杂光照人脸实时检测研究

为了满足嵌入式设备在复杂光照条件下的人脸检测需求,提出了一种基于光照不变特征的人脸检测方法。该方法先基于Retinex理论提取光照不变分量,再以MB-LBP特征进行Ada Boost人脸检测。结合该方法,实现了一种基于嵌入式Linux的人脸实时检测系统。实验与实际使用结果表明,该人脸检测系统具有较高的人脸检出率,且满足实时性要求。     

基于深度学习的人脸颜值评估系统

针对人脸颜值评估系统正确率和实时性低的问题,提出了一种基于深度学习的人脸颜值评估系统.该系统利用基于HOG特征的方法进行人脸检测,采用FaceNet预训练模型提取人脸特征值,提出基于Softmax分类层和ReLU回归层的双层决策模型,并结合人脸局部特征量化值进行人脸颜值评估.在SCUT-FBP5500数据集上进行实验,...     

人脸检测方法综述*

人脸图像处理包括人脸检测、人脸识别、人脸跟踪、姿态估计和表情识别等。为了构造自动处理人脸图像的信息系统,首先需要鲁棒、有效的人脸检测算法。分析了有关人脸检测问题的研究方法,并对其进行了分类和评价。从基于知识的方法、特征不变方法、模板匹配方法和基于外观的方法等四个方面介绍了相关的算法和理论,分析了各种方法的优缺点,并提出了关于人脸检测问题的进一步研究方向。     

基于外观的人脸检测方法*

系统地分析了基于外观的人脸检测方法,并对其进行了分类和评价,从特征脸方法、基于分布的方法、神经元网络、隐Markov模型和支持向量机等方面介绍了人脸检测方法的优缺点和适用领域。最后提出了人脸检测方法未来的研究方向。     

基于C＋＋和OpenCV的人脸识别系统的设计与实现

人脸识别是通过对人的脸部特征信息进行身份识别的一种生物识别技术.研究现实基于人脸识别的身份验证系统具有重要意义.提出一种基于C＋＋和OpenCV的人脸识别系统的设计与实现方法.系统实现的功能模块包括人脸图像采集、图像预处理、人脸检测与定位、人脸特征提取与识别、人脸数据库管理等.系统中人脸检测采用基于Haar-like特征的Haar 分类器,人脸识别采用Eigenfacae算法.系统经过运行测试,结果表明该系统能够满足一般的基于人脸识别的身份验证需求.     

人脸识别系统的活体检测综述

人脸识别系统的快速发展对人脸活体检测技术提出了新要求,包括检测实时性、面对复杂环境的泛化性、对多种攻击类型的鲁棒性以及用户体验的友好性等.主要阐述了人脸活体检测的必要性,对方法进行了分类、整理和总结,根据所提特征的不同,将活体检测分为基于手工特征的方法和基于深度学习的方法,并将近期针对算法泛化性的研究进展归纳为基于辅助监督信号方法、基于域适应域泛化的方法、基于特征解耦的方法、基于噪声建模的方法、基于异常检测的方法,对每类方法的代表性算法进行了分析介绍,详细总结了每类方法的基本思想和优缺点.从各方面系统地概括了人脸活体检测问题,包括不同类型的呈现攻击、先进的人脸活体检测方法、常用公共数据库、标准化评价指标、测试方法等的介绍.此外,还讨论了该领域的难点与挑战,总结了未来的研究方向扣发展趋势.     

基于统计的人脸检测方法研究

基于统计理论的人脸检测是利用统计分析与机器学习的方法寻找出人脸样本与非脸样本各自的统计特征,再使用各自的特征构建分类器,使用分类器完成人脸检测。介绍了基于统计理论的人脸检测的主要方法,并对各种方法进行了比较。     

人脸检测中的眼睛定位算法研究

眼睛是一个在人脸检测中极为重要的人脸特征,因此一种快速可靠的精确定位眼睛的算法对许多实际的应用是十分重要的。本文分析了几种常用的眼睛定位算法,并提出了一种基于肤色信息、人脸面部几何特征和人眼灰度信息的算法。算法采用由粗到细的检测策略,先对AnilK.Jain的Cb、Cr椭圆聚类方法进行了改进,用改进的算法进行肤色提取,经过肤色区域的分析,对人脸区域进行预检测,然后结合人眼几何特征进行初步定位,再利用人眼的灰度信息进行精确定位。该算法定位效率高,并对背景、尺寸等细节具有很好的适应性,在人脸实时检测系统中具有很好的应用价值。     

A robust real-time facial alignment system with facial landmarks detection and rectification for multimedia applications

Face detection often plays the first step in various visual applications. Large variants of facial deformations due to head movements and facial expression make it difficult to identify appropriate face region. In this paper, a robust real-time face alignment system, including facial landmarks detection and face rectification, is proposed. A facial landmarks detection model based on regression tree is utilized in the proposed system. In face rectification framework, 2-D geometrical analysis based on pitch, yaw and roll movements is designed to solve the misalignment problem in face detection. The experiments on the two datasets verify the performance significantly improved by the proposed method in the facial recognition task and outperform than those obtained by other alignment methods. Furthermore, the proposed method can achieve robust recognition results even if the amount of training images is not large.

     

Hybrid-boost learning for multi-pose face detection and facial expression recognition

This paper proposes a hybrid-boost learning algorithm for multi-pose face detection and facial expression recognition. To speed-up the detection process, the system searches the entire frame for the potential face regions by using skin color detection and segmentation. Then it scans the skin color segments of the image and applies the weak classifiers along with the strong classifier for face detection and expression classification. This system detects human face in different scales, various poses, different expressions, partial-occlusion, and defocus. Our major contribution is proposing the weak hybrid classifiers selection based on the Harr-like (local) features and Gabor (global) features. The multi-pose face detection algorithm can also be modified for facial expression recognition. The experimental results show that our face detection system and facial expression recognition system have better performance than the other classifiers.     

E-learning系统中情感识别的研究

传统E-learning系统存在一个最大缺点是感情缺失,为弥补这一不足,需要在其中加入面部表情识别模块.表情识别模块分为3个阶段:人脸检测,图像标准化以及情感分类.其中人脸检测作为第一个阶段,是情感识别的前提.在众多人脸检测方法中,肤色分割是一种简单快捷的方法.以肤色分割为基础,提出了一种比较简单的人脸检测算法.实验结果表明,这种方法能够有效地识别出人脸及其器官(包括眼睛和嘴巴)的位置.     

快速人脸检测与特征定位

人脸检测与特征定位是人脸分析技术的一个重要组成部分,其目标是在图像中搜索人脸特征(如眼、鼻、嘴、耳等)的位置。虽然人们可以毫不费力地完成这些工作,但对于机器来说,这依然是一件极其困难的任务。近几年来该项技术已有了长足的发展,已成功地应用于诸如人脸识别、姿态识别、表情识别、脸部动画等诸多领域。本文利用David Cristinace和Tim Cootes提出的一个多阶段人脸特征检测方法实现了一个实时人脸特征定位系统。同时也对原算法本身作了一些改进,在对精度影响极小的情况下,大大提高了原算法的速度。     

基于肤色模型和中线定位的人脸检测算法

由于外貌、肤色、表情等不同,会导致较高的人脸检测漏检率和误检率。为此,提出一种基于肤色模型和中线定位的多姿态人脸检测算法。利用肤色特征快速排除大部分背景区域,根据人脸的显性特征分割出人脸候选区域,并对边缘检测后的图像进行投影,使用中线定位法实现多姿态人脸的检测与定位。实验结果表明,该算法能实现多姿态人脸的快速检测,黑发单个人脸检测的检测率达93.3%,鲁棒性较强。     

An effective method for detecting facial features and face in human-robot interaction

In this paper, an effective method of facial features detection is proposed for human-robot interaction (HRI). Considering the mobility of mobile robot, it is inevitable that any vision system for a mobile robot is bound to be faced with various imaging conditions such as pose variations, illumination changes, and cluttered backgrounds. To detecting face correctly under such difficult conditions, we focus on the local intensity pattern of the facial features. The characteristics of relatively dark and directionally different pattern can provide robust clues for detecting facial features. Based on this observation, we suggest a new directional template for detecting the major facial features, namely the two eyes and the mouth. By applying this template to a facial image, we can make a new convolved image, which we refer to as the edge-like blob map. One distinctive characteristic of this map image is that it provides the local and directional convolution values for each image pixel, which makes it easier to construct the candidate blobs of the major facial features without the information of facial boundary. Then, these candidates are filtered using the conditions associated with the spatial relationship of the two eyes and the mouth, and the face detection process is completed by applying appearance-based facial templates to the refined facial features. The overall detection results obtained with various color images and gray-level face database images demonstrate the usefulness of the proposed method in HRI applications.     

基于人脸识别技术的智能系统研究与开发

本文针对单人正面人脸图像的定位、特征提取以及识别的方法进行了研究,提出了结合人脸模板和人脸特征进行人脸检测的方法.利用已经定位的人脸图像,确定其眼睛、鼻部及嘴部的几何特征参数,并对实验人脸库进行监督下的分类和统计.在此基础上,实现了一个智能识别系统.     

A coupled encoder–decoder network for joint face detection and landmark localization

Face detection and landmark localization have been extensively investigated and are the prerequisite for many face related applications, such as face recognition and 3D face reconstruction. Most existing methods address only one of the two problems. In this paper, we propose a coupled encoder–decoder network to jointly detect faces and localize facial key points. The encoder and decoder generate response maps for facial landmark localization. Moreover, we observe that the intermediate feature maps from the encoder and decoder represent facial regions, which motivates us to build a unified framework for multi-scale cascaded face detection by coupling the feature maps. Experiments on face detection using two public benchmarks show improved results compared to the existing methods. They also demonstrate that face detection as a pre-processing step leads to increased robustness in face recognition. Finally, our experiments show that the landmark localization accuracy is consistently better than the state-of-the-art on three face-in-the-wild databases.     

人脸识别的方法研究

人脸识别系统主要包括:人脸检测定位,人脸识别两环节。本文简要回顾了人脸自动识别技术的研究背景,重点对近年来人脸自动识别方法的研究进展进行综述,并对各种方法加以评价。总结了现在存在的研究困难,提出了今后的发展方向。     

A comparison of face and facial feature detectors based on the Viola�CJones general object detection framework

The human face provides useful information during interaction; therefore, any system integrating Vision-Based Human Computer Interaction requires fast and reliable face and facial feature detection. Different approaches have focused on this ability but only open source implementations have been extensively used by researchers. A good example is the Viola–Jones object detection framework that particularly in the context of facial processing has been frequently used. The OpenCV community shares a collection of public domain classifiers for the face detection scenario. However, these classifiers have been trained in different conditions and with different data but rarely tested on the same datasets. In this paper, we try to fill that gap by analyzing the individual performance of all those public classifiers presenting their pros and cons with the aim of defining a baseline for other approaches. Solid comparisons will also help researchers to choose a specific classifier for their particular scenario. The experimental setup also describes some heuristics to increase the facial feature detection rate while reducing the face false detection rate.