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Let the Shape Speak - Discriminative Face Alignment using Conjugate Priors

Pedro Martins, Rui Caseiro, João Henriques, Jorge Batista
2012 Procedings of the British Machine Vision Conference 2012  
This means that we estimate not only the mean and the covariance but also the probability distribution of the mean and the covariance (using conjugate priors).  ...  This work presents a novel Bayesian formulation for aligning faces in unseen images.  ...  The Prior Term Faces are nonrigid structures described by continuous dynamic transitions. In the Bayesian paradigm the prior term can be used to encode the underlying dynamic of the shape.  ... 
doi:10.5244/c.26.130 dblp:conf/bmvc/MartinsCHB12 fatcat:xaylnnhnonc7lf6s7ukepdhxmu

Facial Feature Point Detection: A Comprehensive Survey [article]

Nannan Wang, Xinbo Gao, Dacheng Tao, Xuelong Li
2014 arXiv   pre-print
Besides the above three major categories of methods, there are also minor categories of methods which we classify into other methods: graphical model-based methods, joint face alignment methods, independent  ...  AAM-based methods fit a shape model to an image by minimizing texture synthesis errors.  ...  To distinguish the "good" alignments from the "bad" ones among all these initial estimations, a discriminative face alignment evaluation metric is designed by virtue of cascaded AdaBoost framework (Viola  ... 
arXiv:1410.1037v1 fatcat:ye2nza4tabdehpk6rr62cvwute

Robust Face Frontalization For Visual Speech Recognition*

Zhiqi Kang, Radu Horaud, Mostafa Sadeghi
2021 2021 IEEE/CVF International Conference on Computer Vision Workshops (ICCVW)  
parameterized by a deformable shape model.  ...  We propose to use the zero-mean normalized cross-correlation (ZNCC) score to evaluate the ability to preserve facial expressions.  ...  Notice that using the conjugate prior property, the posterior distribution of w is also a gamma distribution, namely the posterior gamma distribution: P (w|e; Σ, µ, ν) = N (e; 0, w −1 Σ)G(w, µ, 1) = G(  ... 
doi:10.1109/iccvw54120.2021.00281 fatcat:pi3uyqtv2nfgnj2zz5eig43bjq

Unsupervised Performance Analysis of 3D Face Alignment [article]

Mostafa Sadeghi, Sylvain Guy, Adrien Raison, Xavier Alameda-Pineda, Radu Horaud
2021 arXiv   pre-print
We address the problem of analyzing the performance of 3D face alignment (3DFA) algorithms. Traditionally, performance analysis relies on carefully annotated datasets.  ...  We empirically show that the proposed pipeline is neither method-biased nor data-biased, and that it can be used to assess both the performance of 3DFA algorithms and the accuracy of annotations of face  ...  This work has been funded by the EU H2020 project #871245 SPRING and by the Multidisciplinary Institute in Artificial Intelligence (MIAI) # ANR-19-P3IA-0003.  ... 
arXiv:2004.06550v5 fatcat:kcuzggtobfhwno53sw76pdncou

Statistical Approach to Shape from Shading: Reconstruction of Three-Dimensional Face Surfaces from Single Two-Dimensional Images

Joseph J. Atick, Paul A. Griffin, A. Norman Redlich
1996 Neural Computation  
We suggest that the brain, through evolution or prior experience, has discovered that objects can be classified into lower-dimensional objectclasses as to their shape.  ...  An algorithm for solving shape-from-shading using this representation is presented.  ...  his assistance in aligning the database, a n d Christina Nargolwala for useful comments on the manuscript.  ... 
doi:10.1162/neco.1996.8.6.1321 pmid:8768397 fatcat:vsy6bnasjvdifepdd5b636v6hm

A penalized likelihood approach to image warping

C. A. Glasbey, K. V. Mardia
2001 Journal of The Royal Statistical Society Series B-statistical Methodology  
The method is motivated by, and used to solve, three applied problems: to register a remotely sensed image with a map, to align microscope images obtained by using different optics and to discriminate  ...  A conjugate gradient algorithm is used to estimate the warping function, which is numerically approximated by a piecewise bilinear function.  ...  We also thank Nick Martin and Norval Strachan for permission to use the microscopy and ®sh images respectively.  ... 
doi:10.1111/1467-9868.00295 fatcat:t7nswwlnlrf3div7z5wcklgzgm

Projective alignment with regions

R. Basri, D.W. Jacobs
2001 IEEE Transactions on Pattern Analysis and Machine Intelligence  
AbstractÐWe have recently proposed an approach to recognition that uses regions to determine the pose of objects while allowing for partial occlusion of the regions.  ...  The region-based approach also uses image information directly, without the construction of intermediate representations, such as algebraic descriptions, which may be difficult to reliably compute.  ...  Aligning the two views with the one-way constraints using three regions. The figure shows an overlay of the two images. The green regions represent the regions used for alignment.  ... 
doi:10.1109/34.922709 fatcat:t4fp5mhz7nhq3bny7ndplvzaqq

Projective alignment with regions

R. Basri, D. Jacobs
1999 Proceedings of the Seventh IEEE International Conference on Computer Vision  
AbstractÐWe have recently proposed an approach to recognition that uses regions to determine the pose of objects while allowing for partial occlusion of the regions.  ...  The region-based approach also uses image information directly, without the construction of intermediate representations, such as algebraic descriptions, which may be difficult to reliably compute.  ...  Aligning the two views with the one-way constraints using three regions. The figure shows an overlay of the two images. The green regions represent the regions used for alignment.  ... 
doi:10.1109/iccv.1999.790411 dblp:conf/iccv/BasriJ99 fatcat:kibih7xc7jbbjbf7qs6yk6laei

An Operant Analysis of Joint Attention Skills

Per Holth
2007 European Journal of Behavior Analysis  
It is argued here, on the one hand, that behavior-analytic work on verbal behavior with children with autism needs to integrate the research body on joint attention.  ...  Joint attention, a synchronizing of the attention of two or more persons, has been an increasing focus of research in cognitive developmental psychology.  ...  This could be investigated by using a conjugate schedule (see Rovee-Collier & Gekoski, 1979) in which the degree of visual orientation towards the child, nodding, and/or smiling of a human face on a  ... 
doi:10.1080/15021149.2007.11434275 fatcat:3kry27bdlveuzatmhzykscn3sq

An operant analysis of joint attention skills

Per Holth
2005 Journal of Early and Intensive Behavior Intervention  
It is argued here, on the one hand, that behavior-analytic work on verbal behavior with children with autism needs to integrate the research body on joint attention.  ...  Joint attention, a synchronizing of the attention of two or more persons, has been an increasing focus of research in cognitive developmental psychology.  ...  This could be investigated by using a conjugate schedule (see Rovee-Collier & Gekoski, 1979) in which the degree of visual orientation towards the child, nodding, and/or smiling of a human face on a  ... 
doi:10.1037/h0100311 fatcat:bxon3zlmvrbrvb2yry4dmbc7sq

EM Algorithms for Weighted-Data Clustering with Application to Audio-Visual Scene Analysis

Israel Dejene Gebru, Xavier Alameda-Pineda, Florence Forbes, Radu Horaud
2016 IEEE Transactions on Pattern Analysis and Machine Intelligence  
We also demonstrate the effectiveness and robustness of the proposed clustering technique in the presence of heterogeneous data, namely audio-visual scene analysis.  ...  We introduce the weighted-data Gaussian mixture and we derive two EM algorithms. The first one considers a fixed weight for each observation.  ...  Since (1) is a Gaussian, a convenient choice for the prior on w, p(w) is the conjugate prior of the precision with known mean, i.e. a gamma distribution.  ... 
doi:10.1109/tpami.2016.2522425 pmid:27824582 fatcat:5sbwwa7hgnggppectm7hskif2u

Probabilistic Slow Features for Behavior Analysis

Lazaros Zafeiriou, Mihalis A. Nicolaou, Stefanos Zafeiriou, Symeon Nikitidis, Maja Pantic
2016 IEEE Transactions on Neural Networks and Learning Systems  
The proposed SFA algorithms were applied for facial behavior analysis, demonstrating their usefulness and appropriateness for this task.  ...  for robust sequence time-alignment.  ...  of the face.  ... 
doi:10.1109/tnnls.2015.2435653 pmid:26068878 fatcat:6hptf7fnwjg6vko5yp53jgob3a

Augmented CycleGANs for Continuous Scale Normal-to-Lombard Speaking Style Conversion

Shreyas Seshadri, Lauri Juvela, Paavo Alku, Okko Räsänen
2019 Interspeech 2019  
We choose the prior distributions over the parameters of the GMMs to be conjugate priors (Bishop, 2006; Murphy, 2012) .  ...  Let us consider the example of an ASR system.  ... 
doi:10.21437/interspeech.2019-1681 dblp:conf/interspeech/SeshadriJAR19 fatcat:tfobvlkjv5dvdeaxvzby3mb2y4

The fine implicative structure of European Portuguese conjugation

Sacha Beniamine, Olivier Bonami, Ana R. Luís
2021 Isogloss  
Recent literature has highlighted the extent to which inflectional paradigms are organisedinto systems of implications allowing speakers to make full use of the inflection systemon the basis of exposure  ...  After outlining the computational methods we use to thateffect, we deploy these methods on a lexicon of about 5000 verbs, and show how the morphological and phonological properties of European Portuguese  ...  Acknowledgements This paper grew out of previous research on Portuguese conjugation by Bonami and Luı ś (2014) and the computational tools for studying implicative structure by Beniamine (2018) .  ... 
doi:10.5565/rev/isogloss.109 fatcat:2i2dpialnjgshlrxiesvv7phzy

A new feature vector using selected bispectra for signal classification with application in radar target recognition

Xian-Da Zhang, Yu Shi, Zheng Bao
2001 IEEE Transactions on Signal Processing  
To avoid these problems, this paper proposes using selected bispectra with the maximum interclass separability as feature vectors of signals.  ...  Radially integrated bispectra (RIB), axially integrated bispectra (AIB), and circularly integrated bispectra (CIB) were used as feature vectors of signals, but many bispectra on integration paths may be  ...  ACKNOWLEDGMENT The authors wish to thank Associate Editor Prof. J.  ... 
doi:10.1109/78.942617 fatcat:ojwiqckxkfck7nsbpanznrpzky
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