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Face-recognition biometric systems have been shown unreliable under the presence of face-spoofing images, creating the need for automatic spoofing detection. In this paper, the effect of image compression degradation on face-spoofing detection is evaluated, based on an algorithm that searches for Moiré patterns due to the overlap of the digital grids, through peak detection in the frequency domain...
This paper presents an embedded facial image analysis framework based on Convolutional Neural Networks (ConvNets). This robust framework has been proposed by Garcia, Delakis and Duffner on general purpose workstations without any constraints on computational and memory resources. We show that ConvNets, which consist of a pipeline of convolution and subsampling operations followed by a Multi Layer...
Current object detection systems reach high detection rates, at the expense of requiring a large training database. This paper presents a new method for object detection, that gives state-of-the-art results, while using a reduced training database. The proposed system relies on a new local feature extraction approach inspired by Convolutional Neural Networks, Principal Component Analysis and Multilayer...
This study addresses the advantage of adding quality information of the biometric signals into a multimedia-based (video and audio) identity verification system. The quality information of the biometric signals can be used in several ways and stages in the biometric system. In this study, the authors introduce quality-based decisions in two stages: score normalisation and frame selection. Quality-based...
This article presents a method aiming at quantifying the visual similarity between an image and a class model. This kind of problem is recurrent in many applications such as object recognition, image classification, etc. In this paper, we propose to label a self-organizing map (SOM) to measure image similarity. To manage this goal, we feed local signatures associated to the regions of interest into...
Current object detection systems provide good results, at the expense of requiring a large training database. This paper presents an unsupervised iterative object detection system using a selection of previously detected objects in order to perform new object detection. Our experiments show that this method enables face detection with a greatly reduced set of examples and outperforms the detection...
We present a novel approach for face recognition based on salient singularity descriptors. The automatic feature extraction is performed thanks to a salient point detector, and the singularity information selection is performed by a SOM region-based structuring. The spatial singularity distribution is preserved in order to activate specific neuron maps and the local salient signature stimuli reveals...
In this paper, a high-level optimization methodology is applied for the implementation of the well-known convolutional face finder (CFF) algorithm for real-time applications on cellular phone, such as teleconferencing, advanced user interfaces, pictures indexing and security access control. This face detector is based on a feature extraction and classification technique which consists in a pipeline...
A novel method for recognition of frontal views of human faces under roughly constant illumination is presented. The proposed scheme is based on the analysis of a wavelet packet decomposition of the face images. Each face image is first located and then, described by a subset of band filtered images containing wavelet coefficients. From these wavelet coefficients, which characterize the face texture,...
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