Wyniki wyszukiwania - BazTech

1

On site processing of video stream for mapping traffic parameters

Pamuła Wiesław, Kłos Marcin Jacek

Zeszyty Naukowe. Transport / Politechnika Śląska

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2022

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z. 117

175--189

EN

Traffic surveillance provides crucial data for the operation of intelligent transportation systems. The growing number of cameras in the transport system poses a problem for the efficient processing of surveillance data. Processing of video data for extracting traffic parameters is usually done using image processing methods and requires substantial processing resources. An alternative way is to transform the video stream and map the traffic parameters using the obtained transform coefficients. Spatiotemporal wavelet transform of the video stream contents, using filter banks, is proposed for mapping traffic parameters. Performed tests prove good resilience to illumination changes of road scenes. Mapping errors are smaller than in the case of the commonly used video detectors at sites on multilane roads with low to moderate traffic load.

2

Object detection in the police surveillance scenario

Wilkowski Artur, Kasprzak Włodzimierz, Stefańczyk Maciej

Annals of Computer Science and Information Systems

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2019

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Vol. 18

363–-372

EN

Police and various security services use video analysis when investigating criminal activity. One typical scenario is the selection of object in image sequence and search for similar objects in other images. Algorithms supporting this scenario must reconcile several seemingly contradicting factors: training and detection speed, detection reliability and learning from sparse data. In the system that we propose a combined SVM/Cascade detector is used for both speed and detection reliability. In addition, object tracking and background-foreground separation algorithm together with sample synthesis is used to collect rich training data. Experiments show that the system is effective, useful and suitable for selected tasks of police surveillance.

3

Moving cast shadow detection using block nonnegative matrix factorization

Yang X., Liu D., Zhou D., Yang R.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2018

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Vol. 66, nr 2

229--234

EN

In recent years, moving cast shadow detection has become a critical challenge in improving the accuracy of moving object detection in video surveillance. In this paper, we propose two novel moving cast shadow detection methods based on nonnegative matrix factorization (NMF) and block nonnegative matrix factorization (BNMF). First, the algorithm of moving cast shadow detection using NMF is given and the key points such as the determination of moving shadow areas and the choice of discriminant function are specified. Then BNMF are introduced so that the new training samples and new classes can be added constantly with lower computational complexity. Finally, the improved shadow detection method is detailed described according to BNMF. The effectiveness of proposed methods is evaluated in various scenes. Experimental results demonstrate that the method achieves high detection rate and outperforms several state-of-the-art methods.

4

Method for pre-processing of level crossing image

Rybalka R., Honcharov K.

Transport Problems

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2015

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T. 10, z. 1

79--86

EN

Actuality of problem in the improvement of transport safety at level crossings (LC) is caused by increasing the number of vehicles and reducing discipline of vehicle drivers. One of ways for solution of this problem is associated with using the video surveillance systems for monitoring danger area of level crossing. In such systems due to the limited bandwidth of data channel usually the image compression techniques are used. In this paper the pre-processing method for compression of images is presented. Proposed method accounts unequal subjective informational content of different LC image regions (using fuzzy logic and wavelet transform). Comparison of this method with plain set partitioning in hierarchical trees (SPIHT) technique showed that proposed method allows obtaining better result at image compression in terms of reconstruction quality and compression ratio.

RU

Актуальность проблемы повышения безопасности движения на железнодорожных переездах обусловлена увеличением количества автотранспортных средств и снижением дисциплины водителей. Одно из направлений для решения данной проблемы связано с использованием систем видеонаблюдения для мониторинга опасной зоны переезда. С учетом ограниченной полосы пропускания канала передачи данных в таких системах обычно применяется сжатие изображений. В данной работе представлен метод предварительной обработки для сжатия изображений. Предложенный метод учитывает неодинаковое субъективное информационное заполнение различных участков изображения переезда (используя нечеткую логику и вейвлет преобразование). Сравнение данного метода с простым методом пространственно упорядоченных иерархических деревьев (SPIHT) показало, что предложенный метод позволяет получить лучший результат при сжатии изображения с точки зрения качества восстановления и степени сжатия.

5

Wizyjny system nadzoru zajętości parkingu

Stawowy M.

Logistyka

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2012

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nr 3

PL

W pracy zaproponowano metodę detekcji zajętości miejsc parkingowych wykorzystującą alternatywną, do obecnie stosowanych, detekcję obrazów. Wszystkie przedstawione metody opierają się o obrazy uzyskiwane z kamer wideo.

EN

The paper proposes a method for detecting occupancy of parking spaces using an alternative to currently used, detection of images. All the methods are based on images obtained from video cameras.

6

Zastosowanie wizyjnego systemu nadzoru ruchu do sterowania ruchem pojazdów na obszarze kontrolowanym

Stawowy M., Szmigiel A.

Logistyka

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2011

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nr 3

PL

W pracy zaproponowano metodę nadzoru nad obszarem kontrolowanym stosując systemy wizyjne. Poza kontrolą wjazdu i wyjazdu przedstawiona została metoda nadzoru ruchu w obszarze kontrolowanym oraz identyfikacja pojazdów. Wszystkie przedstawione metody opierają się o obrazy uzyskiwane z kamer wideo.

EN

In paper proposed supervision of controlled area using visional systems. Outside inspection of entrance and of trip introduced method of supervision of traffic in controlled area and vehicles identification. All introduced methods support by pictures obtained from video cameras.