Face spoofing

  • 文章类型: Journal Article
    近年来,疫情迫使教育系统从传统教学转向在线教学或混合学习。有效监视远程在线考试的能力是限制教育系统中这一阶段在线评估的可扩展性的因素。人类学习是最常用的方法,可以要求学习者在考试中心参加考试,或者通过视觉监控要求学习者打开相机。然而,这些方法需要大量的劳动力,努力,基础设施,和硬件。本文通过捕获考生的实时视频,提出了一种基于AI的自动化监考系统-“考勤系统”,用于在线评估。我们的细心系统包括四个组件来估计错误,如人脸检测,多人检测,脸欺骗,和头部姿势估计。注意网络检测面并绘制边界框以及置信度。注意网还使用仿射变换的旋转矩阵检查面的对齐。将人脸网算法与Attentive-Net相结合来提取地标和面部特征。通过使用浅CNN活跃度网仅针对对齐的面部启动用于识别欺骗面部的过程。使用SolvePnp方程估计考官的头部姿势,检查他/她是否在寻求他人的帮助。犯罪调查和预防实验室(CIPL)数据集和具有各种类型的不当行为的定制数据集用于评估我们提出的系统。大量的实验结果表明,我们的方法更准确,可靠和健壮的监督系统,可以在实时环境中实际实现为自动监督系统。作者报告了改进的准确度为0.87,结合了注意网,活体网和头部姿势估计。
    In recent years, the pandemic situation has forced the education system to shift from traditional teaching to online teaching or blended learning. The ability to monitor remote online examinations efficiently is a limiting factor to the scalability of this stage of online evaluation in the education system. Human Proctoring is the most used common approach by either asking learners to take a test in the examination centers or by monitoring visually asking learners to switch on their camera. However, these methods require huge labor, effort, infrastructure, and hardware. This paper presents an automated AI-based proctoring system- \'Attentive system\' for online evaluation by capturing the live video of the examinee. Our Attentive system includes four components to estimate the malpractices such as face detection, multiple person detection, face spoofing, and head pose estimation. Attentive Net detects the faces and draws bounding boxes along with confidences. Attentive Net also checks the alignment of the face using the rotation matrix of Affine Transformation. The face net algorithm is combined with Attentive-Net to extract landmarks and facial features. The process for identifying spoofed faces is initiated only for aligned faces by using a shallow CNN Liveness net. The head pose of the examiner is estimated by using the SolvePnp equation, to check if he/she is seeking help from others. Crime Investigation and Prevention Lab (CIPL) datasets and customized datasets with various types of malpractices are used to evaluate our proposed system. Extensive Experimental results demonstrate that our method is more accurate, reliable and robust for proctoring system that can be practically implemented in real time environment as Automated proctoring System. An improved accuracy of 0.87 is reported by authors with the combination of Attentive Net, Liveness net and head pose estimation.
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  • 文章类型: Journal Article
    如今,由于手机等电子产品的大量使用,对基于生物特征的软设备的需求正在迅速增加,日常生活中的笔记本电脑和电子产品。最近,医疗保健部门也出现了软生物识别技术,即,面部生物识别技术,因为整个数据,即,(性别,年龄,患者的面部表情和欺骗),医院的医生和其他工作人员通过数字系统管理和转发,以减少文书工作。这个概念使病人和医生之间的关系更友好,使获得医疗报告和治疗更容易,生活中的任何地方和任何时刻。在本文中,我们提出了一种新的基于软生物识别的方法,用于安全的生物识别系统,因为医疗信息在我们的生活中起着至关重要的作用。在提出的模型中,5层基于U-Net的架构用于面部检测,基于Alex-Net的架构用于面部信息的分类,即年龄,性别,面部表情和面部欺骗,等。所提出的模型优于其他现有技术方法。所提出的方法在六个基准数据集上进行了评估和验证,即,NUAA照片冒名顶替者数据库,卡西亚,Adience,组数据集(IOG)的图像,扩展Cohn-Kanade数据集CK+和日本女性面部表情(JAFFE)数据集。所提出的模型实现了94.17%的欺骗精度,83.26%的年龄,性别占95.31%,面部表情占96.9%。总的来说,在提出的模型中进行的修改给出了更好的结果,它将在未来很长的路要走,以支持基于软生物特征的应用。
    Nowadays, the demand for soft-biometric-based devices is increasing rapidly because of the huge use of electronics items such as mobiles, laptops and electronic gadgets in daily life. Recently, the healthcare department also emerged with soft-biometric technology, i.e., face biometrics, because the entire data, i.e., (gender, age, face expression and spoofing) of patients, doctors and other staff in hospitals is managed and forwarded through digital systems to reduce paperwork. This concept makes the relation friendlier between the patient and doctors and makes access to medical reports and treatments easier, anywhere and at any moment of life. In this paper, we proposed a new soft-biometric-based methodology for a secure biometric system because medical information plays an essential role in our life. In the proposed model, 5-layer U-Net-based architecture is used for face detection and Alex-Net-based architecture is used for classification of facial information i.e., age, gender, facial expression and face spoofing, etc. The proposed model outperforms the other state of art methodologies. The proposed methodology is evaluated and verified on six benchmark datasets i.e., NUAA Photograph Imposter Database, CASIA, Adience, The Images of Groups Dataset (IOG), The Extended Cohn-Kanade Dataset CK+ and The Japanese Female Facial Expression (JAFFE) Dataset. The proposed model achieved an accuracy of 94.17% for spoofing, 83.26% for age, 95.31% for gender and 96.9% for facial expression. Overall, the modification made in the proposed model has given better results and it will go a long way in the future to support soft-biometric based applications.
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