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SYSTEM DESIGN 7 Deadly Surveilla While the average layperson can likely surmise a camera's feld of view, its apparent simplicity can be deceptive. This is particularly true where it comes to designing security surveillance systems. Learn how to avoid common mistakes associated with camera layouts, lighting and pixel dilution. By Eric Olson S ecurity cameras are one of the most important tools in the protection of facilities and critical assets. However, the phrase, "What you see is what you get" applies … literally. Proper setup of surveillance cameras is directly related to the level of efectiveness they will provide. One essential aspect of setting up a security camera is its feld of view (FOV). Webster's would tell you that a camera's feld of view is the angle between two rays passing through the perspective center of a camera lens to the two opposite sides of the format. It can be further defned as having a vertical component (vertical feld of view) and a horizontal component (horizontal feld of view). In layman's terms, that means it's the image you see from the camera in either the live or recorded view. Tat sounds easy enough, but there are several mistakes that you should take care to avoid. Te FOV concept can be deceptively straightforward, such that often not a lot of forethought is put into it. However, as you 140 / SECURITYSALES.COM / SEPTEMBER 2013 take the time to further analyze its relationship to other aspects of the perimeter design, the security objectives and even the camera itself, it quickly becomes evident this is a crucial aspect of the total design and something that needs to be determined early on in the process. Read on to discover mistakes commonly experienced in the feld, and use the information as a guide to avoid these types of issues in future deployments. 1. NOT DOING YOUR HOMEWORK One of the frst things to realize is FOV is not an independent variable. As outlined in "8 Points to a Securer Perimeter" (September 2012 SSI or securitysales.com/channel/systemintegration/articles/2012/09/8-points-to-a-securer-perimeter.aspx), camera layout can be an expensive proposition, and it is even more expensive when done wrong. You need to consider that pole placement, detection scene, blind zones and FOV are dependent variables. Changing one impacts the others. Te existence of the variable focus lens has often caused