Wyniki 1-4 spośród 4 dla zapytania: authorDesc:"Michał Lech"

Modified dynamic time warping method applied to handwritten signature authenticity verification DOI:10.15199/13.2017.4.4


  A signature verification system based on static features and time -domain functions of signals obtained using a tablet has been presented in the paper. The signature verification method, based mainly on dynamic time warping coupled with some signature image features, has been described. The FRR measures reflecting the method’s efficiency have been evaluated for verification attempts performed directly after obtaining model signatures and for delayed attempts made after two days. The FAR measures have been assessed both: for simple and for skilled forgeries. The dynamic time warping-based verification has been also examined after applying it to the signals obtained using the developed biometric pen. Obtained results are presented and discussed in the paper. Keywords: handwritten signature verification; dynamic time warping; optimal path tracing; biometric pen.I. Introduction There can be distinguished two main approaches to the verification of signature authenticity, namely static (also called off-line or feature-based) and dynamic (also called on-line or function-based) analysis. In the first approach only the signature image or the signature trajectory formed on the basis of samples taken at particular time moments is analyzed considering such features as number of crossings, pixel density or gravity center distance [1]. In the second approach, time-domain functions describing parameters such as velocity, acceleration, pressure or pen inclination are analyzed. The common methods used in this approach are dynamic time warping [2, 3] and Hidden Markov Models [4, 5] with the first one generally outperforming the latter one, although when enough model signatures are available the contrary can be claimed [6]. In some approaches the methods typically associated with on-line verification, such as dynamic time warping, are used in the off-line analysis based on template matching [7]. In the paper, a method based on both static[...]

SYSTEM WERYFIKACJI AUTENTYCZNOŚCI PODPISU ODRĘCZNEGO DOI:10.15199/59.2016.8-9.77


  W referacie przedstawiono system statycznej i dynamicznej weryfikacji autentyczności podpisu odręcznego, składanego piórem biometrycznym, wyposażonym w 2 akcelerometry, 2 żyroskopy i 3 czujniki ścisku, na rezystancyjnej powierzchni dotykowej, łączącym się bezprzewodowo z urządzeniami komputerowymi. We wstępie przedstawiono architekturę sieciową wielomodalnego systemu biometrii. Przedstawiono warstwę sprzętową systemu weryfikacji autentyczności podpisu, przyjętą metodykę weryfikacji oraz wyniki oceny miar FRR i FAR. Abstract: The static and dynamic signature verification method employing a biometric pen equipped with 2 accelerometers, 2 gyroscopes and 3 pressure sensors, used with resistive surface, connecting wireless with computerized devices, has been presented in the paper. In the introduction the network architecture of the multimodal biometric system has been described. The software of the signature verification system and the utilized methodology of verification have been presented along with the results of FRR and FAR measures assessment. Słowa kluczowe: weryfikacja autentyczności podpisu, Bluetooth 4.0, pióro biometryczne, dynamiczne marszczenie czasu. Keywords: signature verification, biometric pen, dynamic time warping. 1. WSTĘP Przeprowadzone badania rynku [1] dowodzą, że użytkownicy systemów informatycznych wyrażają chęć korzystania z nowych metod weryfikacji tożsamości, jeśli umożliwi im to wzrost wygody korzystania z systemów bankowych oraz zwiększy bezpieczeństwo. Najbardziej popularne obecnie metody weryfikacji wymagają od użytkowników wiedzy (pamiętania hasła lub numeru PIN) albo posiadania specjalnych identyfikatorów (kart dostępu czy elektronicznych tokenów). Oba te rozwiązania nie gwarantują zachowania pełni bezpieczeństwa, ponieważ są one wrażliwe na różnego rodzaju ataki, takie jak: wymuszenia podania hasła osobie postronnej (ang. phishing), czy kradzież. Często jest to forma niewygodna dla użytk[...]

Gesture-based computer control system

Czytaj za darmo! »

In the close future, one may easily imagine that a monitor screen presenting information in a public space, requiring interaction to be handled properly, while no buttons or computer mouse are available will be a typical way of humanmachine interaction. As an example of such devices touch screen viewers in photo laboratories can be given, where customers can choose photos to be printed or touch screen information points. An advantage of using such a way of human- machine interaction in such places over using computer mouse is undeniable but frequent screen cleaning remains indispensable. In the paper a system overcoming this drawback, owing to its touchless operating mode, is presented. This article is an extended version of the work originally presented at the SPA conference [...]

Performance Analysis of Developed Multimodal Biometric Identity Verification System DOI:10.15199/13.2018.4.7


  I. Introduction In spite of the rapid development of the methods of biometric identification, seen particularly in recent years, none of the available methods ensure a perfect credibility of identification or verification and a fully satisfying convenience. In the present state of development of biometry banking procedures besides comparing to the previously stored biometric data of a customer it is required often to show identity card or to make verification through the mobile phone. In the meantime, due to variety of procedures and devices which have become widespread and are in use with different effectiveness, it is still impossible to regard the issue of verifying a bank customers’ identity as solved. Banks tend to use traditional methods of clients identification, thus it is difficult to change their approach. At present in the bank environment one can meet the following problems in this domain: usage of traditional handwritten signatures stored in large databases of such signatures existing in bank repositories, the need of customers’ identity verification visiting the bank teller, inconvenience of the application of certain methods of biometric identification in mobile conditions, lack of databases containing the integrated customers’ biometric data, possible customers’ disagreement for their voice or image registration. The problems related to identity verification, in general, result in financial frauds entailing financial losses. In Poland the loss of over twenty million PLN per year (according to data published by the Polish Bank Association) is officially reported [11]. Therefore, it is of importance to find a solution to the problem of developing the concepts and scenarios of identification of the bank customers. This problem includes the development of new methods of acquisition, storing and protecting information relevant to the identity of accounts (or a credit cards) holders as well [...]

 Strona 1