profil Twój Profil
Kliknij, aby zalogować »
Jesteś odbiorcą prenumeraty plus
w wersji papierowej?

Oferujemy Ci dostęp do archiwalnych zeszytów prenumerowanych czasopism w wersji elektronicznej
AKTYWACJA DOSTĘPU! »

Twój koszyk
  Twój koszyk jest pusty

Czasowy dostęp?

zegar

To proste!

zobacz szczegóły
r e k l a m a
FAIL (the browser should render some flash content, not this).

ZAMÓW EZEMPLARZ PAPIEROWY!

baza zobacz szczegóły

Wyniki wyszukiwania

Wyniki 1-3 spośród 3 dla zapytania: authorDesc:"Grzegorz Szwoch"

» Projekt COPSIMO - nowe techniki dystrybucji multimediów

Andrzej CZYŻEWSKI  Grzegorz Szwoch  Paweł Żwan  
Celem projektu europejskiego COPSIMO (COnvergent Platform for the Secure dIstribution of Multimedia cOntent) jest stworzenie wspólnego dla krajów Unii Europejskiej systemu dystrybucji zawartości multi[...] więcej»
w zeszycie PRZEGLĄD TELEKOMUNIKACYJNY - WIADOMOŚCI TELEKOMUNIKACYJNE 2005/8-9


 

» Estimation of object size in the calibrated camera image

GRZEGORZ SZWOCH  PIOTR DALKA  ANDRZEJ CZYŻEWSKI  
Video surveillance systems are becoming a common tool for improving the public security. However, the efficiency of these systems is limited by a fact that a human operator has to observe constantly a large number of monitors for detection of events occurring in the images captured by cameras. One method of improving the efficiency of the discussed systems is introduction of the automatic tool that assists the human operator by automatically analysing the camera images and informing the operator about important events that were detected [1]. However, accurate detection of events in the camera images requires that the detected moving objects are assigned to proper classes and this classification requires that the physical size of the tracked object (not the size in image pixels[...] więcej»
w zeszycie ELEKTRONIKA - KONSTRUKCJE, TECHNOLOGIE, ZASTOSOWANIA 2009/3


 

» Resolving conflicts in object tracking for automatic detection of events in video

GRZEGORZ SZWOCH  PIOTR DALKA  ANDRZEJ CZYŻEWSKI  
In modern times, video monitoring systems become increasingly complex, consisting of numerous cameras and monitors. It is not possible that the system operator notices every important event that occurs in the monitored areas. Therefore, an automatic tool that analyses images from all cameras and detects important security threats, would be able to assist the operator, noticing him on the detected events and thus improving the level of public security. Such a system is currently under development by the authors of this paper [1, 5]. Performance of automatic event detection in video from monitoring cameras depends on accuracy of the low-level image analysis algorithms, such as detection and tracking of moving objects. The first low-level procedure is usually related to separation of moving object from the static background in each image frame from the camera. The authors use a method based on background modeling as proposed by Stauffer and Grimson [4], which models statistical properties of the background with a mixture of Gaussian models (GMM). The results of background modeling are processed in order to remove shadow pixels (using color and brightness distortion measures) and finally they are cleaned using morphological operations (removing noise, closing holes, etc.). The next processing stage is related to tracking movement of detected objects in successive camera images. For this task we use an effective approach based on Kalman filters [6], although various alternative methods may be found in the literature. However, none of the tracking algorithms define a method of assigning trackers to objects detected in the frame and resolving ambiguous relations between them. Therefore, a procedure for resolving such tracking conflicts was developed, the algorithm is described in the next sections of the paper. The results of object detection and tracking may be used for automatic event detection. The event detector uses a set of d[...] więcej»
w zeszycie ELEKTRONIKA - KONSTRUKCJE, TECHNOLOGIE, ZASTOSOWANIA 2011/1


 

 Strona 1 
r e k l a m a
FAIL (the browser should render some flash content, not this).