Multimodal: The performance of any unimodal biometric system is often got restricted by variable and uncontrolled environmental conditions, sensor precision and reliability. Several trait specific challenges such as pose, expression, aging, etc. for face recognition degrades the system performance. Hence they can only provide low or middle level security. Fusing more than one biometric traits in pursuit of superior performance can be a very useful idea, termed as multi-modal [10] systems. Any such system makes use of multiple biometric traits to enhance system׳s performance especially when a huge number of subjects are enrolled. The false acceptance rate grows rapidly with the database size [4]; hence multiple trait data can be utilized to achieve better performance.
Knuckleprint: The horizontal and the vertical pattern formation in finger knuckleprint images (as shown in Fig. 1(b)) are believed to be very discriminative [47]. The knuckleprint texture is developed very early and lasts very long primarily because they are on the outer side of the hand, hence safely preserved. Its failure to enroll rate (FTE) is observed to be lower as compared to fingerprint and can be acquired easily using an inexpensive setup with lesser user cooperation. The user acceptance favors knuckleprint as unlike fingerprint they are never being associated to any criminal investigations. A comparative study between palmprint and knuckleprint based over the biometric properties is presented in Table 1.
Multimodal: The performance of any unimodal biometric system is often got restricted by variable and uncontrolled environmental conditions, sensor precision and reliability. Several trait specific challenges such as pose, expression, aging, etc. for face recognition degrades the system performance. Hence they can only provide low or middle level security. Fusing more than one biometric traits in pursuit of superior performance can be a very useful idea, termed as multi-modal [10] systems. Any such system makes use of multiple biometric traits to enhance system׳s performance especially when a huge number of subjects are enrolled. The false acceptance rate grows rapidly with the database size [4]; hence multiple trait data can be utilized to achieve better performance.Knuckleprint: The horizontal and the vertical pattern formation in finger knuckleprint images (as shown in Fig. 1(b)) are believed to be very discriminative [47]. The knuckleprint texture is developed very early and lasts very long primarily because they are on the outer side of the hand, hence safely preserved. Its failure to enroll rate (FTE) is observed to be lower as compared to fingerprint and can be acquired easily using an inexpensive setup with lesser user cooperation. The user acceptance favors knuckleprint as unlike fingerprint they are never being associated to any criminal investigations. A comparative study between palmprint and knuckleprint based over the biometric properties is presented in Table 1.
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