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105
Information fusion in biometrics
- Pattern Recognition Letters
, 2003
"... User verification systems that use a single biometric indicator often have to contend with noisy sensor data, restricted degrees of freedom, non-universality of the biometric trait and unacceptable error rates. Attempting to improve the performance of individual matchers in such situations may not p ..."
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Cited by 292 (17 self)
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User verification systems that use a single biometric indicator often have to contend with noisy sensor data, restricted degrees of freedom, non-universality of the biometric trait and unacceptable error rates. Attempting to improve the performance of individual matchers in such situations may not prove to be effective because of these inherent problems. Multibiometric systems seek to alleviate some of these drawbacks by providing multiple evidences of the same identity. These systems help achieve an increase in performance that may not be possible using a single biometric indicator. Further, multibiometric systems provide anti-spoofing measures by making it difficult for an intruder to spoof multiple biometric traits simultaneously. However, an effective fusion scheme is necessary to combine the information presented by multiple domain experts. This paper addresses the problem of information fusion in biometric verification systems by combining information at the matching score level. Experimental results on combining three biometric modalities (face, fingerprint and hand geometry) are presented.
Learning User-Specific Parameters In A Multibiometric System
, 2002
"... Biometric systems that use a single biometric trait have to contend with noisy data, restricted degrees of freedom, failureto -enroll problems, spoof attacks, and unacceptable error rates. Multibiometric systems that use multiple traits of an individual for authentication, alleviate some of these pr ..."
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Cited by 104 (14 self)
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Biometric systems that use a single biometric trait have to contend with noisy data, restricted degrees of freedom, failureto -enroll problems, spoof attacks, and unacceptable error rates. Multibiometric systems that use multiple traits of an individual for authentication, alleviate some of these problems while improving verification performance. We demonstrate that the performance of multibiometric systems can be further improved by learning user-specific parameters. Two types of parameters are considered here. (i) Thresholds that are used to decide if a matching score indicates a genuine user or an impostor, and (ii) weights that are used to indicate the importance of matching scores output by each biometric trait. User-specific thresholds are computed using the cumulative histogram of impostor matching scores corresponding to each user. The user-specific weights associated with each biometric are estimated by searching for that set of weights which minimizes the total verification error. The tests were conducted on a database of 50 users who provided fingerprint, face and hand geometry data, with 10 of these users providing data over a period of two months. We observed that user-specific thresholds improved system performance by 2%, while user-specific weights improved performance by 3%.
A biometric identification system based on eigenpalm and eigenfinger features
- IEEE Transactions on Pattern Analysis and Machine Intelligence
, 2005
"... Abstract—This paper presents a multimodal biometric identification system based on the features of the human hand. We describe a new biometric approach to personal identification using eigenfinger and eigenpalm features, with fusion applied at the matching-score level. The identification process can ..."
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Cited by 49 (4 self)
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Abstract—This paper presents a multimodal biometric identification system based on the features of the human hand. We describe a new biometric approach to personal identification using eigenfinger and eigenpalm features, with fusion applied at the matching-score level. The identification process can be divided into the following phases: capturing the image; preprocessing; extracting and normalizing the palm and strip-like finger subimages; extracting the eigenpalm and eigenfinger features based on the K-L transform; matching and fusion; and, finally, a decision based on the (k, l)-NN classifier and thresholding. The system was tested on a database of 237 people (1,820 hand images). The experimental results showed the effectiveness of the system in terms of the recognition rate (100 percent), the equal error rate (EER = 0.58 percent), and the total error rate (TER = 0.72 percent). Index Terms—Biometrics, multimodal systems, hand-based identification, K-L transform, eigenpalms, eigenfingers. æ
A principled approach to score level fusion in multimodal biometric systems
, 2005
"... Abstract. A multimodal biometric system integrates information from multiple biometric sources to compensate for the limitations in performance of each individual biometric system. We propose an optimal framework for combining the matching scores from multiple modalities using the likelihood ratio s ..."
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Cited by 39 (6 self)
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Abstract. A multimodal biometric system integrates information from multiple biometric sources to compensate for the limitations in performance of each individual biometric system. We propose an optimal framework for combining the matching scores from multiple modalities using the likelihood ratio statistic computed using the generalized densities estimated from the genuine and impostor matching scores. The motivation for using generalized densities is that some parts of the score distributions can be discrete in nature; thus, estimating the distribution using continuous densities may be inappropriate. We present two approaches for combining evidence based on generalized densities: (i) the product rule, which assumes independence between the individual modalities, and (ii) copula models, which consider the dependence between the matching scores of multiple modalities. Experiments on the MSU and NIST multimodal databases show that both fusion rules achieve consistently high performance without adjusting for optimal weights for fusion and score normalization on a case-by-case basis.
Combining implicit polynomials and geometric features for hand recognition”,
- in Pattern Recognition letters,
, 2003
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Personal recognition using hand shape and texture
- IEEE Trans. Image Process
, 2006
"... Abstract—This paper proposes a new bimodal biometric system using feature-level fusion of hand shape and palm texture. The proposed combination is of significance since both the palmprint and hand-shape images are proposed to be extracted from the single hand image acquired from a digital camera. Se ..."
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Cited by 37 (3 self)
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Abstract—This paper proposes a new bimodal biometric system using feature-level fusion of hand shape and palm texture. The proposed combination is of significance since both the palmprint and hand-shape images are proposed to be extracted from the single hand image acquired from a digital camera. Several new hand-shape features that can be used to represent the hand shape and improve the performance are investigated. The new approach for palmprint recognition using discrete cosine transform coeffi-cients, which can be directly obtained from the camera hardware, is demonstrated. None of the prior work on hand-shape or palm-print recognition has given any attention on the critical issue of feature selection. Our experimental results demonstrate that while majority of palmprint or hand-shape features are useful in predicting the subjects identity, only a small subset of these features are necessary in practice for building an accurate model for identification. The comparison and combination of proposed features is evaluated on the diverse classification schemes; naive Bayes (normal, estimated, multinomial), decision trees ( 4 5, LMT),-NN, SVM, and FFN. Although more work remains to be done, our results to date indicate that the combination of se-lected hand-shape and palmprint features constitutes a promising addition to the biometrics-based personal recognition systems. Index Terms—Biometrics, feature level fusion, feature subset selection and combination, hand-shape recognition, palmprint recognition. I.
Deformable Matching Of Hand Shapes For Verification
, 1999
"... We present a method for personal authentication based on deformable matching of hand shapes. Authentication systems are already employed in domains that require some sort of user verification. Unlike previous methods on hand shape-based verification, our method aligns the hand shapes before extract ..."
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Cited by 30 (0 self)
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We present a method for personal authentication based on deformable matching of hand shapes. Authentication systems are already employed in domains that require some sort of user verification. Unlike previous methods on hand shape-based verification, our method aligns the hand shapes before extracting a feature set. We also base the verification decision on the shape distance which is automatically computed during the alignment stage. The shape distance proves to be a more reliable classification criterion than the handcrafted feature sets used by previous systems. Our verification system attained a high level of accuracy: 96:5% genuine accept rate vs. 2% false accept rate. This performance is further improved by learning an enrollment template shape for each user. 1. MOTIVATION Automatic human identification has become an important issue in today's information and network based society. The techniques for automatically identifying an individual based on his physical or behavioral c...
Peg-free hand geometry recognition using hierarchical geometry and shape matching
- IAPR Workshop on Machine Vision Applications
, 2002
"... We propose a feature-based hierarchical framework for hand geometry recognition, based upon matching of geometrical and shape features. Rid of the needs for pegs, the acquisition of the hand images is simplified and more userfriendly. Geometrical significant landmarks are extracted from the segmente ..."
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Cited by 27 (0 self)
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We propose a feature-based hierarchical framework for hand geometry recognition, based upon matching of geometrical and shape features. Rid of the needs for pegs, the acquisition of the hand images is simplified and more userfriendly. Geometrical significant landmarks are extracted from the segmented images, and are used for hand alignment and the construction of recognition features. The recognition process is hierarchical in nature, and it employs a Gaussian Mixture Model for the first group of features, followed by a distance metric classification of the second group of features if necessary. The method has been tested on a medium size dataset of 323 images with promising results of 89 % hit (true acceptance) rate and 2.2 % false acceptance rate. 1
Personal Authentication using Finger Knuckle Surface
"... This paper investigates a new approach for personal authentication using finger back surface imaging. The texture pattern produced by the finger knuckle bending is highly unique and makes the surface a distinctive biometric identifier. The finger geometry features can be simultaneously acquired from ..."
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Cited by 26 (2 self)
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This paper investigates a new approach for personal authentication using finger back surface imaging. The texture pattern produced by the finger knuckle bending is highly unique and makes the surface a distinctive biometric identifier. The finger geometry features can be simultaneously acquired from the same image, at the same time and integrated to further improve the user identification accuracy of such system. The finger back surface images from each of the users are normalized to minimize the scale, translation and rotational variations in the knuckle images. This paper details the development of such an approach using peg-free imaging. The experimental results from the proposed approach are promising and confirm the usefulness of such approach for personal authentication. 1.
Multibiometric systems: Fusion strategies and template security
, 2008
"... Multibiometric systems, which consolidate information from multiple biometric sources, are gaining popularity because they are able to overcome limitations such as non-universality, noisy sensor data, large intra-user variations and susceptibility to spoof attacks that are commonly encountered in un ..."
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Cited by 23 (0 self)
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Multibiometric systems, which consolidate information from multiple biometric sources, are gaining popularity because they are able to overcome limitations such as non-universality, noisy sensor data, large intra-user variations and susceptibility to spoof attacks that are commonly encountered in unibiometric systems. In this thesis, we address two critical issues in the design of a multibiometric system, namely, fusion methodology and template security. First, we propose a fusion methodology based on the Neyman-Pearson theorem for combination of match scores provided by multiple biometric matchers. The likelihood ratio (LR) test used in the Neyman-Pearson theorem directly maximizes the genuine accept rate (GAR) at any desired false accept rate (FAR). The densities of genuine and impostor match scores needed for the LR test are estimated using finite Gaussian mixture models. We also extend the likelihood ratio based fusion scheme to incorporate the quality of the biometric samples. Further, we also show that the LR framework can be used for designing sequential multibiometric systems by constructing a binary decision tree classifier based on the marginal likelihood ratios of the