An Approach to Speech and Iris based Multimodal Biometric System

Int. Journal of Electrical & Electronics Engg.

Vol. 2, Spl. Issue 1 (2015)

e-ISSN: 1694-2310 | p-ISSN: 1694-2426

An Approach to Speech and Iris based Multimodal Biometric System 1

SakshiSahore, 2TanviSood

1

M.Tech Student, 2Assistant Professor ECE Department, Chandigarh Engineering College, Ladran, Mohali

1,2

1

sakshisahore@gmail.com, 2cecm.ece.ts@gmail.com

Abstract—Biometrics is the science and technology of human identification and verification through the use of feature set extracted from the biological data of the individual to be recognized. Unimodal and Multimodal systems are the two modal systems which have been developed so far. Unimodal biometric systems use a single biometric trait but they face limitations in the system performance due to the presence of noise in data, interclass variations and spoof attacks. These problems can be resolved by using multimodal biometrics which rely on more than one biometric information to produce better recognition results. This paper presents an overview of the multimodal biometrics, various fusion levels used in them and suggests the use of iris and speech using score level fusion for a multimodal biometric system.

Keywords—Biometric, unimodal, recognition, score level fusion

the feature variations are captured and stored in a database.

During authentication mode, the features from the subject to be identified are computed and then compared with the stored template in the database. If the features match, the subject is recognized. Figure 1 shows a typical biometric system.

multimodal,

I. INTRODUCTION With the recent advancement in technology and development of electrically interconnected society, there is an essential requirement of accurate personal authentication system to handle various person authentication issues in daily life. There are several authentication systems that we use on daily basis such as personal identification number (PIN), smartcards and passwords. These systems are possession based and knowledge based and can easily be misplaced, forgotten or forged [1]. To overcome these difficulties, biometric systems for authentication are introduced. Biometrics is a robustious approach for the recognition of a person [2].

Biometrics verify the identity of the subject based on a feature set extracted from the subject’s biological characteristics.Biometric characteristics are of two types:

Biometric based person recognition system [3]

II. MODAL SYSTEM A. Unimodal Biometrics A unimodal biometric system uses a single source of biometric information to generate the recognition result.

Most of the deployed real world applications in biometrics are unimodal, that is, they use a single biometric trait for authentication such as a biometric system based on fingerprints [4]. While unimodal biometric systems have successfully been installed in various applications, but unimodal biometrics is still not fully solved problem [5].

These systems a variety of issues like 



Physiological: The characteristics related to the body of a person are called physiological characteristics.

Fingerprints, face, iris, palm geometry, DNA are the examples of the physiological characteristics. These characteristics do not change over time.  Behavioral: The characteristics related to the behavior of a person are called behavioral characteristic. Voice, gait, signature and keystroke are the examples of behavioral characteristics. These are variant in nature.

A biometric system consists of two modes that are enrollment mode and authentication mode. In enrollment mode, the biometric data of the subject is taken and processed for feature extraction. These features are used for the generation of template of that subject in which all NITTTR, Chandigarh

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





Noisy data – The input biometric data might be noisy or the biometric sensors might be susceptible to noise which may lead to inaccurate matching and hence false rejection.

Intra-class variations – This occurs when the biometric data acquired from an individual during verification is not identical to the data stored in the template during enrollment. This occurs due to incorrect interaction of the individual with the sensor.

Non-universality – Sometimes it is possible that certain individuals may not provide a particular biometric causing failure to enroll (FTE).

Spoof attack –Unimodal biometrics are susceptible to spoof attacks where an imposter may attempt to fake 176

Int. Journal of Electrical & Electronics Engg.

Vol. 2, Spl. Issue 1 (2015)

e-ISSN: 1694-2310 | p-ISSN: 1694-2426

the biometric trait of an enrolled user in order to bypass the system.

The problems imposed in the unimodal biometrics limit the accuracy and system performance.

BIOMETRIC FUSION

B. Multimodal Biometrics A multimodal biometric system uses more than one source of biological data to generate the recognition result, for example a multimodal biometric system using iris and ear [6]. Multimodal biometrics overcome the shortcomings of unimodal biometrics [7] and is more reliable because of the use of more than one biometric trait and hence more pieces of information.

Multimodal scenarios: A multimodal biometric system can be designed to work in one of the following scnarios.  Multiple sensors: Highlight all author and affiliation lines.The informationof the same biometric can be acquiredby different sensors [8].The different samples are thenprocessed by the same algorithm and the resultsare fused to get the resultant algorithm.  Multiple instances: The biometric information is extracted from the multiple instances of the same biometric [9].  Multiple algorithms: More than one approach/algorithm is used for feature extraction or classification of the same biometric to improve the system performance [10].  Multiple biometric:Evidence from the multiple biometric characteristics is taken [11].  Multiple samples:Multiple samples are acquired from the same biometric by a single sensor and processed by the same algorithm to obtain the recognition results [12].

BEFORE MATCHIG

SCORE LEVEL

FEATURE LEVEL

AFTER MATCHING

SCORE LEVEL

DECISIO N LEVEL

Fusion Levels in Multimodal Biometrics

 Sensor level fusion:Highlight all author and affiliation lines. Sensor level fusion is done in a system system using multiple sensors or in a system using a single sensor at multiple instances. In this, the biometric data obtained by the sensor is combined.  Feature level fusion:Feature level fusion is done by extracting the features of different biometric sources individually and then combining those features into a single feature vector [14].  Score level fusion:Score level fusion is performed by individually processing (sensing and extracting features) different biometric sources and finding their match scores. These scores are then combined to make classification [15].  Decision level fusion:After each biometric source is processed and recognition decision is made for each biometric data, fusion is executed at the decision level [16].

III. SCORE LEVEL FUSION Score level fusion is the most popular and common approach in the multimodal biometrics system due its simple procedure. Matching scores contain rich information about the input pattern. Each classifiers provides a matching scores and scores of different classifiers are combined to produce the final score.

A. Fusion algorithms

Multimodal Biometric System [13]

Fusion Levels in Multimodal Biometrics: While designing a multimodal system, different fusion strategies can be used to integrate the biometric data.

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When different matching scores of different biometrics are acquired, their fusion is done. For the fusion of the matching scores, different algorithms can be applied.

These algorithms include product rule, sum rule, max rule and min rule.

Consider ( ⃗) as the output of individual classifiers, as a feature vector to ith classifier, R as the number of different classifiers and be the output. The different rules can be applied as

NITTTR, Chandigarh

EDIT-2015

Int. Journal of Electrical & Electronics Engg.

Vol. 2, Spl. Issue 1 (2015)

e-ISSN: 1694-2310 | p-ISSN: 1694-2426

Min max normalization: SENSOR DATA

TEMPLA TE

SENSO R DATA

=

FEATURE EXTRACTI ON

FEATURE EXTRACTI ON

FEATURE VECTOR

FEATURE VECTOR

MATCHIN G

MATCHIN G

MATCH SCORE

MATCH SCORE

( )

µ( )

( )

Where max(s) = maximum value of raw score and min(s) = minimum value of raw score Z-score normalization

=

TEMPLA TE

µ( )

( )

Where µ(s) = mean deviation of set of score vectors and σ(s) = standard deviation of the set of score vectors Median-MAD normalization =

FUSION

Where MAD = median (| TOTAL SCORE

Tanh normalization

DECISI ON

Score Level Fusion in Multimodal Biometric System

Product rule:Different biometric traits of an individual (such as iris, fingerprints and ear) are mutually independent and the product rule is applied based on this. =

( ⃗)

Sum rule: The sum rule takes the scores of the individual classifiers to simply calculate their sum. =

( ⃗)

Max rule:The max rule approximates the output by the maximum value of the scores. = max ( ⃗)

Min rule:The max rule approximates the output by the minimum value of the scores. = min ( ⃗)

B. Normalization Normalization is done after determining the matching scores from different biometrics. Score normalization is essential because the matching scores of different biometrics are obtained from different algorithms and hence may not have the same underlying properties, that is, they may be of different nature and scale. Normalization changes the scale of the different scores and brings them to a common domain. After normalization, the scores are combined. The most common normalization algorithms used are If S = ( , , ,… ,……. ) is a vector of M scores, then the normalization score, will be NITTTR, Chandigarh

EDIT -2015

= 0.5

ℎ 0.01

−

|) − µ( ) +1 ( )

Where µ( )= mean deviation calculated from scores and ( ) = standard deviation calculated from scores.

IV. MULIIMODAL BIOMETRIC USING IRIS AND SPEECH As mentioned earlier, there are two types of biometric characteristics in human beings, physiological characteristics and behavioral characteristics. With the selection of appropriate modals and fusion scheme, optimal results can be achieved. There are several inspirations to choose iris and speech for a multimodal biometric system. Iris is a physiological trait while speech is a behavioral trait. These two biometrics can be combined to form an effective multimodal biometric system. Iris recognition requires small high quality cameras for operating and processes the output in 1 to 2 seconds. Iris patterns carry astonishing amount of information and remain unchanged throughout the individual’s lifetime. Iris recognition suffers no problem with eyeglasses and contact lenses. It is hence, one of the most stable and precise personal identification biometric which gives excellent recognition performance [13] [17].

Voice recognition system is an emerging biometric technology. Voice is usually considered as a behavioral characteristic but it is actually a combination of both physiological and behavioral characteristics. The physiological part of the voice remains invariant while the behavioral part changes over time depending on the age, medication and emotional state of an individual [18].

Voice recognition biometric system is typically cheap with the requirement of a microphone. It has high user preference and the processing speed of 5 seconds with high efficiency [18].

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Int. Journal of Electrical & Electronics Engg.

Vol. 2, Spl. Issue 1 (2015)

V. CONCLUSION AND FUTURE SCOPE The performance of the unimodal biometric recognition systems suffer from several limitations that can be overcome by the use of multimodal biometrics.

Multimodal biometrics combine the information obtained from the different sources through the use of an effective fusion scheme. Multimodal biometric systems work in different scenarios and different fusion levels. The performance of a multimodal biometric system can be improved through the selection of appropriate fusion scheme. In this paper, the modality of iris and speechare suggested with their score level fusion due to its simple procedure and rich information.

[15]

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