Wyniki wyszukiwania - Biblioteka Nauki

1

Examination of the effect of psychophysical factors on the quality of human gait recognition

100%

Derlatka M.

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tom Vol. 8, no. 4

194--198

EN

The paper presents an analysis concerning the influence of selected psychophysical parameters on the quality of human gait recognition. The following factors have been taken into account: body height (BH), body weight (BW), the emotional condition of the respondent, the physical condition of the respondent, previous injuries or dysfunctions of the locomotive system. The study was based on data measuring the ground reaction forces (GRF) among 179 participants (3 315 gait cycles). Based on the classification, some kind of confusion matrix were established. On the basis of the data included in the matrix, it was concluded that the wrong classification was most affected by the similar weight of two confused people. It was also noted, that people of the same gender and similar BH were confused most often. On the other hand, previous body injuries and dysfunctions of the motor system were the factors facilitating the recognition of people. The results obtained will allow for the design of more accurate biometric systems in the future.

2

On-line signature biometric system with employment of single-output multilayer perceptron

63%

Szklarzewski A. , Derlatka M.

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2006

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tom Vol. 26, no. 4

91-102

EN

This paper presents a practical approach to handwritten signature recognition. The biometric system was designed by means of the single-output multilayer perceptrons (MLP). The signatures were acquired using a digitizing tablet which captures information about the signing process, like the pen tip position (x,y), pen tip pressure and pen azimuth, and altitude angles. Both the identification and signature verification problems were considered. The system recognizes forged and original signatures in case of identification and verification problems and, based on it, accepts or denies access for a given user. Working of the designed system allowed to suppose that the presented realization of the signature biometric system can be used in various security systems which have a limited number of registered users.

3

O zastosowaniu czujnika tensometrycznego Penny and Giles w badaniach nad lokomocją dwunożną człowieka

51%

Jaworek K. , Derlatka M. , Dominikowski M.

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tom Z. 20

61-78

PL

W pracy opisano zastosowanie dwubiegunowego czujnika tensometrycznego angielskiej firmy Penny & Giles w badaniach nad lokomocją dwunożną człowieka. Czujnik wchodzi w skład przenośnego elektrogoniometru wyposażonego w cyfrowy rejestrator danych pomiarowych. Uzyskane surowe dane pomiarowe, w postaci względnych przemieszczeń kątowych segmentów kończyny dolnej połączonych stawem, podczas normalnego chodu człowieka, są silnie zakłócone szumem wysokoczęstotliwościowym. Okazało się, że filtracja tych szumów za pośrednictwem filtrów programowych, dostarczonych przez producenta czujnika, jest mało skuteczna. Autorzy pracy opracowali własny filtr cyfrowy wg DWT (ang. Descrete Wavelets Transform) do filtrowania surowych danych pomiarowych. Okazało się, że cyfrowa transformacja falkowa (DWT), falkami z rodziny Daubechies, bardzo dobrze radzi sobie z zakłóceniami pochodzącymi z czujników firmy Penny & Giles i firmowego rejestratora. Uzyskane po filtracji sygnały biomechaniczne można dalej poddawać dalszemu przetwarzaniu, np. różniczkowaniu w celu uzyskania informacji o prędkościach i przyspieszeniach kątowych segmentów kończyny dolnej nogi człowieka podczas chodu po względnie płaskiej i utwardzonej powierzchni.

EN

This paper deals with the experimental measurements, data filtering and theoretical representation of the angular position of a human leg in 3-D space during normal and pathological walking. The angular position of a human leg during walking in sagittal plane was measured by a new electrogoniometer made by a UK company named Penny & Giles. This system is a spatial mechanism made of a group of links which are coupled by proper angular sensor. This instrument enables an indirect evaluation of the angular position of a human leg in the 3-D space from knowledge of the system geometry and from the angular value readings. This instrument is light, small-sized technologically new and is easy to use. However, its dynamics features have not been analyzed in the literature. Therefore we decided to analyze the instrument in order to built a DWT (Discrete Wavelets Transform) filter for filtering data recorded by a electrogoniometer Penny & Giles. We built filter corresponding to Daubechies wavelets, DAUB # 20. The DWT filter is sufficient for filtering high frequency noise which exists during experimental measurement of the angular position of a human leg during normal and pathological gait. Filtering using Daubechies wavelets - DAUB # 20 is more efficient than commercial numerical filtering delivered by Penny & Giles company.

4

Analiza kinematyki i dynamiki chodu osób z porażeniem połowiczym

51%

Ogrodnik J. , Derlatka M. , Piszczatowski S.

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tom z. 8

133--138

PL

Celem pracy była analiza chodu osób z porażeniem połowiczym po udarze mózgu. Dokonano porównania wybranych parametrów lokomocji osób z porażeniem do chodu osób zdrowych, a także kończyny po stronie porażonej i nieporażonej. Analizie poddano 10 osób, w tym 4 kobiety i 6 mężczyzn. Wyniki badań przedstawiono na tle rezultatów chodu z naturalną prędkością młodych, zdrowych osób, stanowiących grupę porównawczą.

EN

The aim of this paper was to analyse the gait of people after stroke with hemiplegia and make comparision with the health people’s walk. Gait parameters obtained for paralyzed limb were compared with those obtainted for health one. Ten people after strokes with hemiplegia, including 4 women and 6 men, were taken into consederation. The results were presented on the background of the walk of the young, health people who were the reference group.