In this final assignment, the topic of biometric systems is addressed in theoretical and practical terms. The scientific side of biometrics is briefly described at the beginning. Before describing the sole construction of such a system, various errors are described that allow the assessment of the accuracy of authentication and the properties that each biometric system must contain in order to function correctly. Each biometric system is based on a specific fusion model. The application part of the final assignment is made on the fusion model of the decision-making level, which is graphically and textually elaborated, while the others are listed and briefly explained. The complexity is implemented using two biometric features: a fingerprint and a face image, which are described in detail along with selected algorithms for their recognition based on the field of computer vision.