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Online signature verification: Improving performance through pre-classification based on global features

Online signature verification: Improving performance through...

引用

17th International Conference on Image Analysis and processing, ICIAP 2013

作者： Parodi, Marianela Gómez, Juan Carlos Lab. for System Dynamics and Signal Processing FCEIA Universidad Nacional de Rosario Argentina

ISBN: (纸本)9783642411892

In this paper, a pre-classification stage based on global features is incorporated to an online signature verification system for the purposes of improving its performance. The pre-classifier makes use of the discriminative power of some global features to discard (by declaring them as forgeries) those signatures for which the associated global feature is far away from its respective mean. For the remaining signatures, features based on a wavelet approximation of the time functions associated with the signing process, are extracted, and a Random Forest based classification is performed. The experimental results show that the proposed pre-classification approach, when based on the apppropriate global feature, is capable of getting error rate improvements with respect to the case where no pre-classification is performed. The approach also has the advantages of simplifying and speeding up the verification process. © 2013 Springer-Verlag.

关键词： Classification (of information)

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Gradient-based motion vector estimation using variable block shape 11

Gradient-based motion vector estimation using variable block...

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11th European signal processing Conference, EUSIPCO 2002

作者： Hino, Masatoshi Hamada, Nozomu Signal Processing Lab. Dep. of System Design Engineering Keio University Japan

Motion vector estimation of image seqence is one of the important process in image coding, robot vision etc. A useful method of motion vector estimation in the gradient-based method which uses the relationship between the spatial intensity gradient of image and the intensity difference between frames. We propose two block gradient-based methods using variable block shape and size in order to realize accurate estimation of motion vector. The first one uses variable block shape, and estimation is performed at every pixels. The second method uses square block with variable size, and estimation is done for each block. Simulation results show that both algorithms give more accurate estimation than conventional block gradient-based method. © 2002 EUSIPCO.

关键词： Motion estimation

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Voice activity detection with array signal processing in the wavelet domain 11

Voice activity detection with array signal processing in the...

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11th European signal processing Conference, EUSIPCO 2002

作者： Hioka, Yusuke Hamada, Nozomu Signal Processing Lab. Department of System Design Engineering Keio Univ. Japan

In many conventional voice activity detection (VAD) methods, speech signal is assumed to be acquired in high quality. However, human-machine interface based on speech is usually employed in indoor environment where various interferences exist, therefore, the VAD performance is seriously deteriorated. In this paper, we propose a novel VAD method with array signal processing on wavelet domain, in which we utilize the time, frequency and space information in the speech signal to separate interferences. In the proposed method, speech signal acquired by microphone array is at first decomposed into appropriate subbands with wavelet packet, and then array signal processing is executed on each subbands to realize VAD system for speech signal arriving from particular direction. © 2002 EUSIPCO.

关键词： Speech recognition

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Optimal Parameter Estimation Algorithms from Quantized Outputs 9

Optimal Parameter Estimation Algorithms from Quantized Outpu...

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9th International Conference on Control, Decision and Information Technologies, CoDIT 2023

作者： Gómez, Juan Carlos Sad, Gonzalo Daniel Fceia Universidad Nacional de Rosario Cifasis Lab. for Systems Dynamics and Signal Processing Rosario Argentina

ISBN: (纸本)9798350311402

Recursive identification algorithms for the parameter estimation of linear systems from multilevel quantized outputs are introduced in this paper. The proposed algorithms are proved to be optimal in the sense that they minimize the a posteriori parameter estimation error covariance matrix. Numerical simulations are carried out to illustrate their performance for different quantization steps and signal-to-Noise Ratios, as well as their capability to track time varying parameters. © 2023 IEEE.

关键词： Linear systems

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Both direction and time of arrival estimation by using beamforming and MUSIC algorithm for stepped FM array radar

Both direction and time of arrival estimation by using beamf...

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The 2004 47th Midwest Symposium on Circuits and systems - Conference Proceedings

作者： Fujita, Atsushi Fukue, Tosihiko Hamada, Nozomu Signal Processing Lab. Dept. of System Design Engineering Keio University Yokohama-shi 223-8522 Japan

In this research, we propose a method to estimate both direction of arrival (DOA) and time of arrival (TOA) using stepped FM radar system. The method uses beamformer and MUSIC algorithm with respect to time and space. The multiple target fs directions and distances are estimated accurately, and they are combined to represent the parameter of each target. Some simulations are performed and they show the validity of our method.

关键词： Radar

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Selective parallel interference cancellation for uplink cyclic-prefix CDMA

Selective parallel interference cancellation for uplink cycl...

引用

2005 IEEE 16th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2005

作者： Kan, Zheng Wenbo, Wang Decarreau, Guillaume Wireless Signal Processing Lab. Beijing University of Posts and Telecomms Beijing China Wireless System Lab. France Telecom R and D Center Beijing China

ISBN: (纸本)3800729091

Code division multiplex access with cyclic prefix (CP-CDMA) is regarded as one of the best candidates for the broadband wireless communication systems in the uplink. This paper proposes a selective parallel interference cancellation (S-PIC) for uplink CP-CDMA. With less complexity and good resistance to near-far effect, the S-PIC can achieve better bit error rate(BER) performance than the conventional interference cancellation. Computer simulation demonstrates its effectiveness and conclusion is followed. © 2005 IEEE.

关键词： Interference suppression

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Multi-modal speech recognition using correlativity between modality

Multi-modal speech recognition using correlativity between m...

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18th International Symposium on Intelligent signal processing and Communication systems, ISPACS 2010

作者： Sato, Yuki Hamada, Nozomu Signal Processing Lab. Department of System Design Engineering Keio University 3-14-1 Hiyoshi Yokohama 223-8522 Japan

ISBN: (纸本)9781424473717

In recent years, to achieve robust speech recognition against noises, Audio-Visual Speech Recognition (AVSR) system utilizing not only audio but also visual information of lip has been studied. This paper proposes a decision method of the weight called stream exponent representing reliability ratio of audio and visual features. The method focuses on the correlation between audio and visual modality in order to estimate the optimal stream exponent. Furthermore, we modified the stream exponent using periodicity of speech, such as pitch, to handle abrupt noises. An audio-visual database is comprised of specific speaker's lip image sequences and audio sequences. The contents of the utterance are Japanese counting numbers and sound-alike words. Using this database we constructed the AVSR system and performed an evaluation experiment. The obtained results verify the availab.lity of the proposed method under a variety of noisy environment. © 2010 IEEE.

关键词： Acoustic noise

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A feature map approach to pose estimation based on quaternions 7th

A feature map approach to pose estimation based on quaternio...

引用

7th International Conference on Artificial Neural Networks, ICANN 1997

作者： Winkler, S. Wunsch, P. Hirzinger, G. German Aerospace Research Establishment DLR Institute of Robotics and System Dynamics Wessling82230 Germany Signal Processing Lab of the Swiss Federal Institute of Technology in Lausanne Switzerland

ISBN: (纸本)3540636315

This paper proposes a novel solution to the problem of pose estimation of three-dimensional objects using feature maps. Our approach relies on quaternions as the mathematical representation of object orientation. We introduce the rigid map, which is derived from Koho-nen's self-organizing feature map. Its topology is fixed and chosen in accordance with the quaternion representation. The map is trained with computer-generated object views such that it responds to a preprocessed input image with one or more sets of object orientation parameters. Experimental results demonstrate that a pose estimate within the accuracy requirements can be found in more than 90% of all cases. Our current implementation operates at near frame rate on real input images. © Springer-Verlag Berlin Heidelberg 1997.

关键词： Self organizing maps

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Feature combination based on Belief Function Theory for online signature verification

Feature combination based on Belief Function Theory for onli...

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Conferencia Latinoamericana En Informatica (CLEI)

作者： Marianela Parodi Juan C. Gómez Lab. for System Dynamics & Signal Processing Universidad Nacional de Rosario & CIFASIS Rosario Argentina

ISBN: (纸本)9781509016341

One of the most challenging problems in online signature verification is to select the best features to model the signatures. A widely used technique to address this problem is to combine different feature sets selected by different criteria. In this paper, the combination of three different feature sets, viz., an automatically selected feature set, a feature set relevant to Forensic Handwriting Experts (FHEs), and a global feature set, on the basis of a score level fusion scheme, is proposed. In order to address the problem of conflicting results appearing when several classifiers are being used, the proposed combination is performed within the framework of the Belief Function Theory (BFT). Two different models, namely, the Denoeux and the Appriou models, are used to embed the problem within this framework, where the fusion is performed resorting to two well-known combination rules, namely, the Dempster-Shafer (DS) and the Proportional Conflict Redistribution (PCR5) one. Experimental results on a publicly availab.e database, prove that the proposed fusion scheme allows the system to have a very good trade-off between verification results and reliability.

关键词： Decision support systems Radio frequency

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EEG signal analysis based on time-variant coupled network Lattice model

EEG signal analysis based on time-variant coupled network La...

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ICBPE 2006 - 2006 International Conference on Biomedical and Pharmaceutical Engineering

作者： Minfen, Shen Guoliang, Chang Shuwang, Wang Beadle, Patch J. Key Lab. of Digital Signal and Image Processing of Guangdong Province Shantou University Shantou China School of System Engineering Portsmouth University Portsmouth United Kingdom

ISBN: (纸本)8190426249

Brain electrical activity is widely accepted as the typical non-stationary signal. In addition, there exist more evidences that both EEG and ERP signals are chaotic signal produced by the nonlinear dynamics system. To investigate the time-varying nonlinear dynamics of the ERP under specified cognitive tasks, a novel model based on the time-variant coupled map lattice system is proposed for this purpose. The time-variant largest Lyapunov exponent (LLE) is also defined as the quantitative parameters to reveal the global characters of system and discover new information. Several simulations and real ERP signals under different fixed location cue were examined in terms of LLE spectra for studying the signal's dynamic complexity. The experimental results show that the brain chaos changes with time under different attention tasks of the information processing. The influence of the LLE with the scopes size of cues mainly occurs in P2 period. No simple linearly relationship between the scopes of cues and the influence of complexity is found. © 2006 Research Publishing Services.

关键词： dynamics

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