Publications by Weifeng Li | EPFL Graph Search

Related publications (9)

Identification of Aging Faces using A-stack Classification Model

The problem of time validity of biometric models has received only a marginal attention from researchers. In this paper, we investigate the aging influence on the classifier scores of genuine client. Our studies show that as age progresses the classifier s ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2009

Beamforming with a Maximum Negentropy Criterion

Philip Neil Garner, Weifeng Li

In this paper, we address a beamforming application based on the capture of far-field speech data from a single speaker in a real meeting room. After the position of the speaker is estimated by a speaker tracking system, we construct a subband-domain beamf ...

2009

Verification of Aging Faces Using Local Ternary Patterns and Q-Stack Classifier

Weifeng Li, Andrzej Drygajlo

This paper deals with the influence of age progression on the performance of face verification systems. This is a challenging and largely open research problem that deserves more and more attention. Aging affects both the shape of the face and its texture, ...

Springer2009

Client-specific A-stack model for adult face verification across aging

Andrzej Drygajlo, Weifeng Li

The problem of time validity of biometricmodels has received only a marginal attention from researchers. In this paper, we propose to manage the aging influence on the adult face verification system by an A-stack age modeling technique, which uses the age ...

2011

Keyword Detection for Spontaneous Speech

Hervé Bourlard, Aude Billard, Weifeng Li

This paper presents a system for keyword detection in spontaneous speech. Keywords are predefined through a set of acoustic examples provided by the users. Keyword detection proceeds in two steps: keyword searching and verification. To address the problem ...

2009

Robust Log-Energy Estimation and its Dynamic Change Enhancement for In-car Speech Recognition

Hervé Bourlard, Weifeng Li

The log-energy parameter, typically derived from a full-band spectrum, is a critical feature commonly used in automatic speech recognition (ASR) systems. However, log-energy is difficult to estimate reliably in the presence of background noise. In this pap ...

Ieee-Inst Electrical Electronics Engineers Inc2013

Gaze quality assisted automatic recognition of social contexts in collaborative Tetris

Patrick Jermann, Marc-Antoine Nüssli, Weifeng Li

The use of dual eye-tracking is investigated in a collabora- tive game setting. Social context influences individual gaze and action during a collaborative Tetris game: results show that experts as well as novices adapt their playing style when interacting ...

2010

Using dual eye-tracking to unveil coordination and expertise in collaborative Tetris

Patrick Jermann, Marc-Antoine Nüssli, Weifeng Li

The use of dual eye-tracking is investigated in a collabora- tive game setting. The automatic collection of information about partner’s gaze will eventually serve to build adaptive interfaces. Following this agenda, and in order to identify stable gaze pat ...

2010

Exploring personnal aspects using eye-tracking modality in Tetris-playing

Patrick Jermann, Marc-Antoine Nüssli, Weifeng Li

2011