Wyniki wyszukiwania - Biblioteka Nauki

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Real-Time Object Tracking using Gradient Vector Flow

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Azadi S. , Pourjam E. , Nikkerdar A. , Sharifi M.

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tom R. 89, nr 1a

280--283

EN

In this paper an object tracking system with utilizing optical flow technique, and Gradient Vector Flow (GVF) active contours is presented. Optical flow technique is less sensitive to background structure and does not need to build a model for the background of image so it would need less time to process the image. GVF active snakes have good precision for image segmentation. However, due to the high computational cost, they are not usually applicable. Since precision is one of the important factors in the image segmentation, several methods have been developed to overcome the computational speed. In this paper, we, first, recognize the moving object. Then, the object fame with some pixels surrounding to it, was created. Then, this new frame is sent to the GVF filed calculation procedure. Contour initialization is obtained based on the selected pixels. This approach increases the calculation speed, and therefore makes it possible to use the contour for the tracking. The system was built, and tested with a microcomputer. The results show a speed of 10 to 12 frames per second which is considerably suitable for object tracking approaches.

PL

W artykule przedstawiono system śledzenia obiektu z wykorzystaniem techniki Optic Flow oraz Gradiend Vector Flow. Wykrywanie ruchomego obiektu stanowi pierwszy etap działania, następnie ramka zawierająca obiekt przesyłana jest do algorytmu GVF, gdzie określany jest zarys obiektu. Dzięki temu podejściu możliwe jest wykorzystanie, wymagającego obliczeniowo GVF w śledzeniu obiektów. Przedstawiono wyniki eksperymentalne.

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Potential of oyster mushrooms for the biocontrol of sugar beet nematode [Heterodera schachtii]

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Palizi P. , Goltapeh E. M. , Pourjam E. , Safaie N.

Journal of Plant Protection Research

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2009

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tom 49

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nr 1

27-33

EN

The potential of oyster mushrooms to attack and kill sugar beet cyst nematode (Heterodera schachtii) was studied. The ability of Pleurotus ostreatus, P. sajor-caju, P. florida, P. flabellatus, P. ostreatus (sporeless), P. eryngii and Hypsizygus ulmarius to prey on the cyst nematode was confirmed. Nematodes were inoculated on water agar plates on which a single sparse fungal colony of one of the above mentioned fungi was grown. Nematodes were quickly immobilized after inoculation the plates with each Pleurotus species, with mortality of about 96%, 72%, 55%, 52%, 20%, 23% and 62%, respectively. Nematicidal activities of culture filtrates of Pleurotus species and H. ulmarius against H. schachtii were also studied in vitro. Extracts of P. ostreatus could paralyse 90% of nematodes whereas P. eryngii could paralyse only 50% of nematodes. The efficacy of old mushroom compost from cultures of P. ostreatus and P. sajor-caju in controlling cysts on sugar beet (Beta vulgaris ICI) were studied under greenhouse conditions. The results showed that 100 and 200 grams of mushroom compost per 3 kilogram/pot could significantly control cysts, reducing more than 85% cysts in soil. Presence of cysts on the roots and larvae inside roots were compared with the control treatment.

PL

Badano potencjał grzybów ostrygowych do atakowania i zabijania mątwika burakowego (Heterodera schachtii). Potwierdzono zdolność pasożytowania Pleurotus ostreatus, P. sajor-caju, P. florida, P. flabellatus, P. ostreatus (niezarodnikujący), P. eryngii i Hypsizygus ulmarius na mątwiku burakowym. Płytki z agarem wodnym, na którym rosły rzadkie kolonie tych grzybów zaszczepiono mątwikiem burakowym. Po inokulacji nicienie były szybko unieruchomione na płytkach z każdym gatunkiem Pleurotus, a śmiertelność nicieni wynosiła odpowiednio 96%, 72%, 55%, 52%, 20%, 23% and 62%. Badano także aktywność nicieniobójczą in vitro filtratów kultur gatunków Pleurotus i H. ulmarius przeciwko mątwikowi burakowemu. Wyciągi z P. ostreatus sparaliżowały 90% nicieni, podczas gdy P. erynii sparaliżował tylko 50% nicieni. Efektywność starego kompostu z kultur P. ostreatus i P. sasor-caju w zwalczaniu cyst mątwika buraka (Beta vulgaris ICI) badano w warunkach szklarniowych. Wyniki wykazały, że 100 i 200 gramów kompostu z grzybów na 3-kilogramowy wazon mogły istotnie zwalczyć cysty, zmniejszając ich ilość w ziemi o ponad 85%. Ilość cyst i larw w korzeniach porównano z kombinacja kontrolną.

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Ektaphelenchoides sylvestris sp. nov. (Nematoda: Ektaphelenchinae) from Iran

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Pedram M. , Pourjam E. , Atighi M. R. , Ye W. , Houshmand A.

Annales Zoologici

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2012

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tom 62

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nr 2

EN

Ektaphelenchoides sylvestris sp. nov. is described and illustrated. The new species was recovered from the galleries of bark beetles from a dead Pinus sylvestris L. tree and characterized by females with 644-843 µm long body, lip region 7.5-9.0 µm wide, separated from the rest body with a shallow constriction, stylet 18-23 µm long, excretory pore 72-85 µm far from anterior end, postuterine sac short, 5-11 µm long and male absence. By having a short postuterine sac, the new species comes close to four known species of genus namely E. attenuata, E. musae, E. pini and E. winteri.