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Wyszukujesz frazę "Doroz, R." wg kryterium: Autor


Tytuł:
An accurate fingerprint reference point determination method based on curvature estimation of separated ridges
Autorzy:
Doroz, R.
Wrobel, K.
Porwik, P.
Powiązania:
https://bibliotekanauki.pl/articles/331403.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
biometrics
image processing
fingerprint recognition
Kolmogorov–Smirnov statistical test
reference point
biometria
przetwarzanie obrazu
rozpoznawanie linii papilarnych
test statystyczny
punkt odniesienia
Opis:
This paper presents an effective method for the detection of a fingerprint’s reference point by analyzing fingerprint ridges’ curvatures. The proposed approach is a multi-stage system. The first step extracts the fingerprint ridges from an image and transforms them into chains of discrete points. In the second step, the obtained chains of points are processed by a dedicated algorithm to detect corners and other points of highest curvature on their planar surface. In a series of experiments we demonstrate that the proposed method based on this algorithm allows effective determination of fingerprint reference points. Furthermore, the proposed method is relatively simple and achieves better results when compared with the approaches known from the literature. The reference point detection experiments were conducted using publicly available fingerprint databases FVC2000, FVC2002, FVC2004 and NIST.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2018, 28, 1; 209-225
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biometric recognition system based on the motion of the human body gravity centre analysis
Autorzy:
Porwik, P.
Zyguła, J.
Doroz, R.
Proksa, R.
Powiązania:
https://bibliotekanauki.pl/articles/333932.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
dane biometryczne
środek ciężkości
podpis
rozpoznawanie
biometrics
centre of gravity
signature
recognition
Opis:
In this paper we present a novel approach that enables the determination and measurement of important features associated with the human body movement. This information can be used in the construction of a biometric personal identification system. Biometrics is, essentially, a pattern recognition system based on measurements of unique physiological or behavioural features as acquired from an individual. The domain of biometric techniques is currently placed within recently developed disciplines of science. Biometry or biometrics is simply defined as automatically recognizing a person using distinguishing traits and is widely used in various security systems. Biometry can be defined as a method of personal identification based on individuals' physical and behavioural features. Physiological biometrics covers data coming directly from a measurement of part of a human body, for example a fingerprint, the shape of the face, or from the retina. Behavioural biometrics analyses data obtained on the basis of an activity performed by a given person, for example speech and the handwritten signature. The system of biometrics defined above can now be expanded, and a new biometrics system can be considered. In our approach, human foot pressure on a surface is measured and the pressure data retrieved. The pressure parameters are collected without the necessity of any movements of the feet.
Źródło:
Journal of Medical Informatics & Technologies; 2010, 15; 61-69
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determining valuable ranges of handwritten signature using fuzzy approach and window method
Autorzy:
Kudłacik, P.
Doroz, R.
Powiązania:
https://bibliotekanauki.pl/articles/333527.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
signature recognition
window method
fuzzy sets
rozpoznawanie podpisu
zbiory rozmyte
Opis:
The paper proposes possible improvements in signature recognition approach based on window method. The analysis focuses on a stage of window preprocessing using fuzzy sets in order to choose significant ranges of each signature. Proposed extension allows the solution to improve in two areas. First of all minimizing a number of processed windows significantly reduces computation time. Secondly, filtered signatures with valuable information about significant ranges allow the system to recognize signatures of a poor or good quality. Developed method of signature quality assessment can be used in any signature recognition system, regardless of used method of analysis. Merging the information about signature quality and choosing only important signature ranges should also improve the overall detection results, however, more examinations are needed to confirm this statement.
Źródło:
Journal of Medical Informatics & Technologies; 2015, 24; 23-30
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hybrid verification method based on finger-knuckle analysis and keystroke dynamics
Autorzy:
Wesolowski, T. E.
Safaverdi, H.
Doroz, R.
Wrobel, K.
Powiązania:
https://bibliotekanauki.pl/articles/333719.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
user verification
keystroke dynamics
finger-knuckle analysis
weryfikacja użytkownika
dynamika pisania na klawiaturze
analiza palców
Opis:
The increasing number of personal data leaks becomes one of the most important security issues hence the need to develop modern computer user verification methods. In the article, a potential of biometric methods fusion for continuous user verification was assessed. A hybrid approach for user verification based on fusion of keystroke dynamics and knuckle images analysis was presented. Verification is performed by a classification module where an ensemble classifier was used to verify the identity of a user. A proposed classifier works on a database which comprises of knuckle images and keyboard events for keystroke dynamics. The proposed approach was tested experimentally. The obtained results confirm that the proposed hybrid approach performs better than methods based on single biometric feature hence the introduced method can be used for increasing a protection level of computer resources against forgers and impostors. The paper presents results of preliminary research conducted to assess the potential of biometric methods fusion.
Źródło:
Journal of Medical Informatics & Technologies; 2017, 26; 26-36
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Method for identification of fragments of lip prints images on the basis of the generalized hough transform
Autorzy:
Wrobel, K.
Doroz, R.
Powiązania:
https://bibliotekanauki.pl/articles/333845.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
lip print recognition
Generalized Hough Transform
similarity measure
ozpoznawanie wydruku warg
podobieństwo miary
Opis:
The paper presents a new method for identification of fragments of lip print images on the basis of the Generalized Hough Transform (GHT). The effectiveness of this method was verified in practice. The maximum value obtained from the accumulator array after the Hough transform has been assumed as the measure of similarity between a lip print image and a reference object. The advantage of this method is the possibility of use in forensic science to identify persons who left lip prints at crime scenes.
Źródło:
Journal of Medical Informatics & Technologies; 2013, 22; 189-193
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Method of signature recognition with the use of the complex features
Autorzy:
Doroz, R.
Pałys, M.
Orczyk, T.
Safaverdi, H.
Powiązania:
https://bibliotekanauki.pl/articles/333247.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
biometrics
signature recognition
complex features
biometria
rozpoznawanie podpisu
funkcje złożone
Opis:
In this paper a new method of handwritten signatures verification has been proposed. This method, for each signature, creates complex features which are describing this signature. These features are based on dependencies analysis between dynamic features registered by tablets. These complex features are then used to create vectors describing the signature. Elements of these vectors are calculated using measures proposed in this work. The similarity between signatures is assessed by determining the similarity of vectors in the compared signatures. Research, whose results will be presented in the further part of this work, have shown a high efficiency of verification using proposed method.
Źródło:
Journal of Medical Informatics & Technologies; 2014, 23; 155-162
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New method for finding a reference point in fingerprint images with the use of the IPAN99 algorithm
Autorzy:
Wróbel, K.
Doroz, R.
Powiązania:
https://bibliotekanauki.pl/articles/333037.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
odcisk
punkt odniesienia
IPAN99
fingerprint
reference point
Opis:
This study presents a new method for finding a reference point in fingerprint images. The proposed method is based on the IPAN99 algorithm, which detects high curvature points on a contour of a graphical object. This algorithm was adjusted in the study to detect high curvature points on friction ridges. It allows locating a reference point on a fingerprint image. Since the IPAN99 algorithm requires that the thickness of an analysed contour should be of one pixel, each fingerprint image was adequately prepared before submitting to the analysis with the IPAN99 algorithm. Evaluation of the efficiency of the method consisted in comparing the distances between coordinates of reference points determined with the use of the proposed method and indicated by an expert. The developed method was compared with other algorithms used for determining a reference point.
Źródło:
Journal of Medical Informatics & Technologies; 2009, 13; 59-63
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New methods to determine similarity of signatures based on local extremes
Autorzy:
Doroz, R.
Mitas, M.
Powiązania:
https://bibliotekanauki.pl/articles/332892.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
podpis własnoręczny
dynamiczne cechy podpisu
metody regresji liniowej
dynamiczny czas wypaczania
handwritten signatures
dynamic signature features
linear regression method
dynamic time warping
Opis:
Authentication based on handwritten signature is one of the most accepted authentication systems based on biometry. In this paper a method for the automatic verification of on-line handwritten signatures using three similarity measures is described. The proposed approach, is based on extreme values and dynamic features of the signature. In investigations proposed coefficients together with the factor [R2] were connected and new signature recognition quality has been achieved.
Źródło:
Journal of Medical Informatics & Technologies; 2008, 12; 63-67
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New signature similarity measure based on average differences
Autorzy:
Wróbel, K.
Doroz, R.
Powiązania:
https://bibliotekanauki.pl/articles/332878.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
rozpoznawanie podpisu
podobieństwo miary
średnia różnic
signature recognition
similarity measure
average differences
Opis:
This paper presents a new method of recognizing handwritten signatures. Signature was treated as a collection of features of specific values. As features the values of x, y coordinates of signature points and the pressure p in its consecutive points have been used. Additionally, before comparing them, the signatures were properly prepared. The method discussed in the paper is a modification of the method based on average differences. This modification consists in dividing signatures into windows of the preset size and measuring the value of similarity between the windows according to their position in the signature. The paper shows the construction of a new similarity measure taking into consideration the modifications introduced and the results of the research obtained by means of this similarity measure.
Źródło:
Journal of Medical Informatics & Technologies; 2008, 12; 51-56
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On some optimalization of signature recognition
Autorzy:
Doroz, R.
Bargielski, M.J.
Powiązania:
https://bibliotekanauki.pl/articles/333444.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
rozpoznawanie podpisu
IPAN99
metody optymalnych poszukiwań
signature recognition
optimum seeking methods
Opis:
Signature recognition is one of the important problems nowadays. In paper we present known method of pattern (curves) recognition, i.e. algorithm IPAN99 and researches over its optimization; there are many control parameters which influence on recognition results. We present some quasi-optimal set of control parameter. Our next aim is to automatically find proper parameters. Thus some optimum seeking method for unimodale and multimodale function is proposed.
Źródło:
Journal of Medical Informatics & Technologies; 2008, 12; 201-206
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Person verification based on keystroke dynamics
Autorzy:
Doroz, R.
Porwik, P.
Safaverdi, H.
Powiązania:
https://bibliotekanauki.pl/articles/334042.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
keystroke dynamics
ensemble of classifiers
biometrics
dynamika pisania na klawiaturze
zespół klasyfikatorów
biometria
Opis:
This paper presents a new multilayer ensemble of classifiers for users verification who use computer keyboard. The special keyboard extracts the key pressure and latency between keyboard keys pressed during password entered. When user is typing password the system creates a pattern based on time and key pressure. For users verification group of classifiers have been proposed. It allows to obtain the higher accuracy level compared to alternative techniques. The efficiency of the proposed method has been confirmed in the experiments carried out.
Źródło:
Journal of Medical Informatics & Technologies; 2015, 24; 39-44
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Personal identity verification method based on lips photographs
Autorzy:
Wrobel, K.
Doroz, R.
Porwik, P.
Naruniec, J.
Kowalski, M.
Powiązania:
https://bibliotekanauki.pl/articles/333548.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
biometrics
lip features
data classification
biometria
cechy wargi
klasyfikacja danych
Opis:
The paper presents a personal identification method based on lips photographs. This method uses a new approach to the extraction and classification of characteristic features of the mouth from photographs. It eliminates the drawbacks that occur during the acquisition of lip print images with the use of the forensic method that requires special tools. Geometrical dimensions of the entire mouth as well as of the upper and lower lips were adopted as the features, on the basis of which the verification is performed. An ensemble classifier was used for the classification of the features obtained. The effectiveness of the classifier has been verified experimentally.
Źródło:
Journal of Medical Informatics & Technologies; 2015, 24; 59-65
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Signature characteristic points determination by means of the IPAN99 algorithm
Autorzy:
Doroz, R.
Widuch, S.
Powiązania:
https://bibliotekanauki.pl/articles/333847.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
IPAN99
metoda DTW
regresja liniowa
DTW method
linear regression method
Opis:
The handwritten signature is often used for the identity confirmation. From the specialized graphic tablet, we receive the information in form of time strings. In this paper, the research results are presented which refer to the effect of applying the method of point detection of the highest curvature. Signatures are normalized by means of a DTW method, where two time strings representing the signature features are matched.
Źródło:
Journal of Medical Informatics & Technologies; 2007, 11; 105-113
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Signatures recognition method by using the normalized Levenshtein distances
Autorzy:
Doroz, R.
Wróbel, K.
Porwik, P.
Powiązania:
https://bibliotekanauki.pl/articles/333029.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
rozpoznawanie podpisu
właściwości dynamiczne
odległość Levenshteina
signature recognition
dynamic features
Levenshtein distance
Opis:
This study examines the effectiveness of normalized Levenshtein metrics in the process of recognition of handwritten signatures. Three methods of normalization of the Levenshtein metric were taken into consideration. In addition, it was determined, which signature features are most important during their comparisons with the use of the aforementioned metric. The following signature features were examined: coordinates of signature points, pen pressure in successive points, and different types of pen speed. The influence of individual parameters of the Levenshtein algorithm on the obtained results was also determined, and the best method of normalization was selected.
Źródło:
Journal of Medical Informatics & Technologies; 2009, 13; 73-77
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The method for determining the characteristic points of signatures based on IPAN99 algorithm
Autorzy:
Doroz, R.
Kostorz, I.
Powiązania:
https://bibliotekanauki.pl/articles/333911.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
charakterystyczne punkty
rozpoznawanie podpisu
IPAN99
characteristic points
signature recognition
Opis:
The paper puts forward a new method of determination of signatures' characteristic points. The method is based on seeking points of the highest curvature using the IPAN99 algorithm. The way of IPAN99 algorithm parameters' automatic selection for a particular signature has been fully described. Moreover, the way of determination of additional characteristic points, important for a signatures analysis, has been shown. The presented results of carried out experiments confirm that the proposed method is useful for signature recognition and verification.
Źródło:
Journal of Medical Informatics & Technologies; 2010, 15; 41-46
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł

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