“Not the Usual Suspects”: A Study of Factors Reducing the Effectiveness of CCTV

Keval, Hina; Sasse, M. Angela

doi:10.1057/sj.2008.2

Cited by 10 publications

(19 citation statements)

References 7 publications

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“…1,2 A common task for a surveillance operator in a video surveillance system is to detect critical events, which involves scanning multiple video streams to search for suspicious activities such as loitering or intrusions. 3–5 Studies, however, have found that human capability for this task is limited. 4,6…”

Section: Introductionmentioning

confidence: 99%

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Hotspot: Making computer vision more effective for human video surveillance

Nguyen

Feng

Liu

2016

Information Visualization

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Studies have shown that the human capability of monitoring multiple surveillance videos is limited. Computer vision techniques have been developed to detect abnormal events to support human video surveillance; however, their results are often unreliable, thus distracting surveillance operators and making them miss important events. This article presents Hotspot as a surveillance video visualization system that can effectively leverage noisy computer vision techniques to support human video surveillance. Hotspot consists of two views: a designated focus view to summarize videos with detected events and a video-bank view surrounding the focus view to display source surveillance videos. The focus view allows an operator to quickly dismiss false alarms and focus on true alarms. The video-bank view allows for extended human video analysis after an important event is detected. Hotspot further provides visual links to assist quick attention switch from the focus view to the video-bank view. Our experiments show that Hotspot can effectively integrate noisy, automatic computer vision detection results and better support human video surveillance tasks than the baseline video surveillance with no or only basic computer vision support.

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Section: Introductionmentioning

confidence: 99%

“…A comprehensive survey on video surveillance system design and evaluation is beyond the scope of this article. Please refer to Keval and Sasse 5,18 and Stedmon 19 for a good discussion. Our article is also relevant to the research on video visualization.…”

Section: Introductionmentioning

confidence: 99%

Hotspot: Making computer vision more effective for human video surveillance

Nguyen

Feng

Liu

2016

Information Visualization

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“…2019 ) and, crucially, online monitoring of public spaces. Online monitoring with CCTV can be proactive or reactive (Keval and Sasse 2010 ). Proactive surveillance involves active monitoring of the CCTV array by operators in order to detect crime.…”

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confidence: 99%

“…Reactive surveillance involves operators responding to requests from other individuals within the control room or elsewhere. For example, police radio the CCTV control room to request information about a suspect, location or developing incident (Keval and Sasse 2010 ). Both proactive and reactive surveillance can aid early detection of crimes and, thus, avoid minor incidents escalating by allowing rapid and effective deployment of police resources (Levesley and Martin 2005 ; Piza et al.…”

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confidence: 99%

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Searching in CCTV: effects of organisation in the multiplex

Tatler

2021

Cogn. Research

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CCTV plays a prominent role in public security, health and safety. Monitoring large arrays of CCTV camera feeds is a visually and cognitively demanding task. Arranging the scenes by geographical proximity in the surveilled environment has been recommended to reduce this demand, but empirical tests of this method have failed to find any benefit. The present study tests an alternative method for arranging scenes, based on psychological principles from literature on visual search and scene perception: grouping scenes by semantic similarity. Searching for a particular scene in the array—a common task in reactive and proactive surveillance—was faster when scenes were arranged by semantic category. This effect was found only when scenes were separated by gaps for participants who were not made aware that scenes in the multiplex were grouped by semantics (Experiment 1), but irrespective of whether scenes were separated by gaps or not for participants who were made aware of this grouping (Experiment 2). When target frequency varied between scene categories—mirroring unequal distributions of crime over space—the benefit of organising scenes by semantic category was enhanced for scenes in the most frequently searched-for category, without any statistical evidence for a cost when searching for rarely searched-for categories (Experiment 3). The findings extend current understanding of the role of within-scene semantics in visual search, to encompass between-scene semantic relationships. Furthermore, the findings suggest that arranging scenes in the CCTV control room by semantic category is likely to assist operators in finding specific scenes during surveillance.

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Who can best find Waldo? Exploring individual differences that bolster performance in a security surveillance microworld

Marois

Hodgetts

Chamberland

et al. 2021

Applied Cognitive Psychology

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Closed-circuit television (CCTV) surveillance units largely rely on the support of surveillance operators. Although this job is cognitively challenging, few studies have investigated the main human factors improving the ability to detect critical incidents in this context. This study aimed to explore the contribution of individual characteristics and cognitive abilities to performance in a realistic CCTV monitoring simulation.Non-expert participants took part in a surveillance simulation and were screened on several measures of individual differences. Improved detection abilities and quicker speed of detection were related to lower age and to better knowledge of the area, cognitive flexibility, working memory, and visual/threat detection abilities. Moreover, more false alarms were associated with higher goal commitment but with lower working memory, visual/threat detection abilities, and cognitive flexibility. Results highlight the potential to screen for a series of cognitive and non-cognitive skills as part of personnel selection procedures for CCTV centers.

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“Not the Usual Suspects”: A Study of Factors Reducing the Effectiveness of CCTV

Cited by 10 publications

References 7 publications

Hotspot: Making computer vision more effective for human video surveillance

Hotspot: Making computer vision more effective for human video surveillance

Searching in CCTV: effects of organisation in the multiplex

Who can best find Waldo? Exploring individual differences that bolster performance in a security surveillance microworld

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