Simulated multiplexed CCTV: The effects of screen layout and task complexity on user performance and strategies
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Successful closed circuit television (CCTV) surveillance relies on the skill and competence of operators performing complex visual tasks. Techniques can be employed during the design of control rooms that facilitate performance by increasing the probability of operators noticing an incident, maximising viewing comfort and reducing workload. This article describes an exploratory study in which two experiments were developed to simulate a multiplexed CCTV security monitoring task of a specific area. The experiments investigated the effectiveness of techniques for facilitating operator performance: mapping the images presented on CCTV according to the layout and logical viewing process of multiple images. The findings suggested that manipulating the layout of images improved task efficiency and provided novel insights into strategies and behaviours that participants adopted. Further consideration was given to suspicious activities within the context of a university campus and raised interesting questions regarding the generalisation of suspicious acts across different locations.
Keywordsclosed circuit television surveillance suspicious behaviour control room design operator performance human factors
Work funded through the EPSRC Rail Research UK, with the cooperation of Network Rail. The authors are indebted to the anonymous reviewers of this article who offered valuable and constructive feedback.
- Byers, J.C., Bittner, A.C. and Hill, S.G. (1989) Traditional and raw task load index (TLX) correlations: Are paired comparisons necessary? In: A. Mital (ed.) Advances in Industrial Ergonomics and Safety I. London: Taylor and Francis, pp. 481–485.Google Scholar
- Donald, C. (1998) Ergonomic considerations in CCTV viewing. Hi-Tech Security Systems Publication 4 (3), http://www.leaderware.com/Hitech/ergonomic%20monitoring.htm.
- Grimes, J.J. (1996) On the failure to detect changes in scenes across saccades. In: A.A. Kathleen (ed.) Vancouver Studies in Cognitive Science, Perception, Vol 5. New York: Oxford University Press.Google Scholar
- Itti, L., Koch, C. and Niebur, E. (1998) Model of saliency-based visual attention for rapid scene analysis. IEEE Transactions on Pattern Analysis and Machine Intelligence 20 (11), doi: 10.1109/34.730558.Google Scholar
- Keval, H.U. and Sasse, M.A. (2006) Man or a gorilla? Performance issues with CCTV technology in security control rooms. In: R.N. Pikaar, E.A.P. Koningsveld and P.J.M. Settels (eds.) Proceedings of IEA 2006 Congress, International Ergonomics Association 16th Triennial Congress; 9–14 July, Maastricht, The Netherlands. Elsevier, CD-ROM.Google Scholar
- Mery, D. (2005) Suspicious behaviour on the tube. The Guardian, 22 September.Google Scholar
- Parasuraman, R. et al (2009) Detecting threat-related intentional actions of others: Effects of image quality, response mode and target cuing on vigilance. Journal of Experimental Psychology: Applied 15 (4): 275–290.Google Scholar
- Pethick, A.J. and Wood, J. (1989) Closed circuit television and user needs. In: E. Megaw (ed.) Contemporary Ergonomics 1989. London: Taylor and Francis.Google Scholar
- Stedmon, A.W., Harris, S., Carse, A., Sharples, S.C. and Wilson, J.R. (2008) Tracking a suspicious person using CCTV: But what do we mean by suspicious behaviour? In: P. Bust (ed.) Contemporary Ergonomics 2008. London: Taylor and Francis.Google Scholar
- Underwood, G., Foulsham, T., van Loon, E. and Underwood, J. (2005) Visual attention, visual saliency, and eye movements during the inspection of natural scenes. Artificial Intelligence and Knowledge Engineering Applications: A Bioinspired Approach Lecture Notes in Computer Science 3562: 459–468.Google Scholar
- Wallace, E. and Diffley, C. (1998) CCTV: Making it work. CCTV control room ergonomics. Police Scientific Development Branch Publication, 14/98.Google Scholar
- Wallace, E., Diffley, C. and Aldridge, J. (1996) Good Practice for the Use and Management of Town Centre CCTV, Proceedings of IEEE 30th International Carnahan Conference on Security Technology, 2–4 October, Lexington, KY, USA: IEEE, pp. 171–175.Google Scholar
- Wallace, E., Diffley, C., Baines, E. and Aldridge, J. (1997) Ergonomic design considerations for public area CCTV safety and security applications. In: P. Seppälä, T. Luopajärvi, C.H. Nygård and M. Mattila (eds.) Proceedings of IEA 1997 Congress, International Ergonomics Association 13th Triennial Congress; 29 June–4 July, Tampere, Finland: Elsevier.Google Scholar
- Wood, J. (1997) The ergonomics of closed circuit television (CCTV) systems. In: P. Seppälä, T. Luopajärvi, C.H. Nygård and M. Mattila (eds.) Proceedings of IEA 1997 Congress, International Ergonomics Association 13th Triennial Congress, 29 June–4 July, Tampere, Finland: Elsevier.Google Scholar
- Wood, J. and Clarke, T. (2006) Practical guidelines for CCTV ergonomics, In: R.N. Pikaar, E.A.P. Koningsveld and P.J.M. Settels (eds.) Proceedings of IEA 2006 Congress, International Ergonomics Association 16th Triennial Congress; 9–14 July. Maastricht, The Netherlands: Elsevier, CD-ROM.Google Scholar