Liveness Detection: Iris
- PDF / 2,119,755 Bytes
- 70 Pages / 547.087 x 737.008 pts Page_size
- 99 Downloads / 197 Views
Lambertian Law Lamberts cosine law states that the reflected or transmitted luminous intensity in any direction from an element of a perfectly diffusing surface varies as the cosine of the angle between that direction and the normal vector of the surface. ▶ Face Recognition, Near-infrared ▶ Heterogeneous Face Biometrics
Large Scale Biometric Database Based on their size all biometric datasets are classified into three (some sources indicate four) categories: small size, medium size, large scale, and very large scale data bases. The size of datasets is determined by the number of participating users. A small size database can contain biometric data of up to 1,000 users. A medium size database accounts for 10,000–100,000 users. A large (and very large) scale datasets include biometric data of more than 1,000,000 users. Since each user can be represented by two or more classes in a database, some references indicate the size of datasets in classes rather than in users. ▶ Face Databases and Evaluation ▶ Iris Sample Synthesis ▶ Large Scale System Design
Large Scale Biometric System Design ▶ Large Scale System Design
Lambertian Surface Large Scale System Design Lambertian surface is a technique used to light particular surfaces of virtual objects within a scene, which causes all closed polygons to reflect light equally in all directions. This means that the surface brightness to an observer is the same regardless of the observer’s angle of view. ▶ Face Sample Quality ▶ Illumination Compensation #
2009 Springer Science+Business Media, LLC
C HIN -H UNG T ENG 1, W EN -H SING H SU 2 1 Yuan Ze University, Taiwan, ROC 2 National Tsing Hua University, Taiwan, ROC
Synonym Large scale biometric system design
884
L
Large Scale System Design
Definition A large scale biometric system is a system involving the authentication of a huge number of users via the biometric features. A Large Scale ▶ Biometric Database is generally designed for civilian applications and is not merely the increased size of database compared to the personal use system. In the case of a large scale system, there is greater emphasis on the issues of system reliability and flexibility. To meet the requirements of public use, the system must have a high enrollment rate and adapt to environmental variations. Security is another issue in designing such a system due to the large number of users enrolled. A one-to-many matching may sometimes lead to system breakdown, thus other authentication policies may be applied to complement the one-to-many matching to enhance system reliability, such as cross validation of multiple biometric features.
a biometric system is not merely used for preventing terrorist attacks. Many government provision such as welfare disbursement, driver license application, and voter registration can benefit from the construction of a nationwide biometric system. For example, many airports have installed a biometric authentication system to expedite the procedure of visa and passport examination. The United States government has launched
Data Loading...
