Zoekresultaat: 2 artikelen

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Tijdschrift Tijdschrift voor Veiligheid x Jaar 2014 x
Artikel

Automatische gedragsanalyse voor effectiever cameratoezicht in de openbare ruimte

Tijdschrift Tijdschrift voor Veiligheid, Aflevering 4 2014
Trefwoorden Behavior analysis, Threat detection, Action recognition, Tracking, Re-identification
Auteurs Dr. Henri Bouma, Drs. Jeroen van Rest, Dr. ir Gertjan Burghouts e.a.
SamenvattingAuteursinformatie

    To improve security in crowded environments, such as airports, shopping malls and railway stations, the number of surveillance cameras (CCTV) is rapidly increasing. However, the number of human operators remains limited and only a selection of the video streams can be observed. This makes it hard for an operator to be proactive. This paper gives an overview of novel developments that may lead to more efficient camera surveillance and a more proactive role for camera operators. It focuses on three main steps in this process of video content analysis: pedestrian tracking, action recognition and behavior analysis. Tracking and re-identification (i.e. recognizing a person in another camera) was initially only evaluated on off-line benchmark datasets, though recently it has gained in maturity with live demonstrations in realistic crowded environments and measured improved operator efficiency. For action recognition and automatic behavior recognition, we observe that the simple patterns, such as loitering detection, are emerging in many applications. Human action recognition obtains very high performance values in controlled environments and it is progressing towards more realistic environments. More advanced approaches, such as pickpocket recognition in a shopping mall and the detection of threats to trucks on a parking lot have been developed and the first systems have been presented in live demonstrations. Our main contribution is that we structure the recent advances and the emerging applications of video analysis for security applications, explain and interpret the results, and identify opportunities for the near future.


Dr. Henri Bouma
Dr. Henri Bouma is research scientist bij TNO.

Drs. Jeroen van Rest
Drs. Jeroen van Rest is consultant bij TNO.

Dr. ir Gertjan Burghouts
Dr. ir. Gertjan Burghouts is research scientist bij TNO.

Dr. Klamer Schutte
Dr. Klamer Schutte is research scientist bij TNO.

Ir. Jan Baan
Ir. Jan Baan is research scientist bij TNO.
Artikel

Weet wat je tweet

Het gebruik van Twitter door de wijkagent en het vertrouwen in de politie

Tijdschrift Tijdschrift voor Veiligheid, Aflevering 3 2014
Trefwoorden social media, Twitter, police, confidence, trust, community policing
Auteurs Dick Roodenburg en Hans Boutellier
SamenvattingAuteursinformatie

    Community policing is a common strategy in the Dutch police organization: working in a geographically bounded area, in close proximity and engagement with the local population. The use of Twitter by local police-officers is an increasingly popular way of communicating in this context. Prior research has indicated that there is a positive relation between the use of Twitter by the local police officer and citizens’ confidence in the police. But what factors determine this confidence and how can it be strengthened by using Twitter? This article examines the nature of police tweets and shows how tweets can contribute to improving the degree of confidence between citizens and the police. To determine what factors influence confidence we made use of the model of trust and confidence by Jackson and Bradford. This model differentiates between ‘effectiveness’, ‘fairness’, and ‘engagement’. These three factors are used to explore the way tweets might influence confidence in policing. The empirical research included interviews with three police officers who twitter actively, as well as interviews with 30 ‘followers’ living in the neighbourhood where the police officer works. Also an analyses has been carried out of the tweets made by the police officers in one year, 3.506 tweets in total, by categorizing the tweets according to the model of Jackson and Bradford. We conclude that the model of Jackson and Bradford is useful to explore the possible relationship between the use of Twitter and citizens confidence in the police. Using Twitter by the local police officers seems to make a possible contribution to the degree of confidence in the police. Our categorization of Twittermessages allowed us to give practical recommendations to local police officers how to use Twitter in order to improve confidence among citizens. The data also suggest that followers appreciate the fact that local police officers show their knowledge of current affairs in the neighbourhood.


Dick Roodenburg
Dick Roodenburg is beleidsadviseur en coördinator integrale veiligheid bij de gemeente De Ronde Venen (Utrecht).

Hans Boutellier
Hans Boutellier is bijzonder hoogleraar Veiligheid en Burgerschap aan de Vrije Universiteit Amsterdam en lid van de raad van bestuur van het Verwey-Jonker Instituut.
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