Security Camera Mysteries: What Is Angular Field Of View?
Anybody who’s considering adding a first-rate video surveillance system (consisting of security cameras and some form of monitoring and recording equipment, at minimum) needs to know a few things before committing any money to one. For one, understanding how widely the camera can “see” is important, because buying a camera that can only see in very narrow ranges means one is buying a camera that under-performs.
This is where knowing what the camera’s angular field of view comes in.
In cameras, “field of view” is sometimes abbreviated as FOV and anything outside of the camera’s field of view isn’t able to be recorded as an image by the camera.
In effect, it’s that part of the world that that can be seen through the camera at any given position of the camera and at any orientation (up, down, sideways etc.) in space.
However – and this is important – a camera’s FOV isn’t exactly the same as the camera’s angular field of view, which is normally abbreviated as AOV.
And though the terms are often used in a kind of interchangeable way, the difference is in how each is measured.
For FOV, the standard of measurement involves feet, inches and the like. AOV in degrees of an arc (10 degrees, 20 degrees etc.).
Basically, a security camera’s AOV means the field of view of the camera when it pointed in any direction space and amount of view that’ll be present.
If a camera has a 15 degree down angle – like what one might see in a camera sitting on the top of a corner of a building – it will be able to see certain things that a camera pointed downwards at a 30 degree AOV can’t and vice versa.
Perhaps it’s easier to understand by imaging a horizon line.
A camera pointed at zero degrees of arc will be looking straight-on at the line and will be able to see equal degrees of arc above and below the line.
Point the camera downwards by 5 degrees, though, and less of the field above the line will be seen but more of the field below the line will also be viewable. It’s a kind of trade-off.
Normally, an effective AOV or angular field of view for a security camera depends on the size of the area a camera must keep under surveillance.
This depends on the height of the camera as well. If it’s up high, 15 to 30 downward degrees of arc may be best. If it’s down low but must be able to see a wide area, then an upwards arc of from 15 to 25 degrees might work.
Most people who are working with their system installers should try to get a look at what the camera is imaging and what the area being visualized by the camera looks like at various angles and then make a determination from there.
Always make sure the camera is able to sweep upwards and downwards or that it can see a wide area both above and below the horizon line in order to obtain cameras that can keep under surveillance enough of the area that needs to be secured.
Get the best security cameras online. Visit Chinavasion.com or paste this link into your browser: http://www.chinavasion.com/index.php/cName/surveillance-equipment/
About the Author
Rose Li is the PR Manager for Chinavasion, China’s premier dropshipper for wholesale consumer electronics
How a Local Mom Saved $7724 Shopping Online
|
|
Sunbeam 5891 2-Pound Programmable Breadmaker, White $68.49 2 LB LOAF13-HOUR DELAY BAKE;12 COOKING FUNCTIONSEXPRESSBAKE BREAD MAKER CYCLE BAKES IN UNDER 1 HOURLED DISPLAYEASY-CLEAN TOUCH CONTROL PANELNON-STICK REMOVABLE BAKING PANINCLUDES INSTRUCTION BOOK WITH BREAD RECIPESUPC : 027045651783Shipping Dimensions : 18.30in X 14.00in X 13.40inEstimated Shipping Weight : 20.6812… |
|
|
Hamilton Beach 48464 Brewstation Summit 12-Cup Programmable Coffeemaker $44.99 This BrewStation coffeemaker has stainless steel on its control panel for added style. It also has everything the BrewStation brand is famous for: one-hand dispensing for quick fill-ups and an insulated tank with gentle heater to keep coffee tasting fresh for hours. Your last cup tastes as fresh as the first. Product Specifications: One-hand dispensing – no carafe, no pouring, no spills Us… |
|
|
Farberware Classic Stainless Steel 17-Piece Cookware Set $114.54 Functional and handsome, the 17 pieces in this economical Farberware set provide all the basic necessities for home cooking and baking. Each pot or pan is constructed of gleaming 18/10 stainless steel that encapsulates a thick aluminum core in the base, the “full cap” advantage that allows Farberware Classic to cook evenly without hotspots. Stainless-steel lids and black phenolic handles in tradit… |
|
|
Belkin Pivot-Plug Surge Protectors $26.99 Features a rotating outlet design that gives you much more convenience and flexibility in placing your plugged-in devices than traditional products Belkin Pivot Plug Surge Protectors provide premium power protection for your professional workstations and connected devices. It’s rotating outlet design gives you much more convenience and flexibility in placing your plugged-in devices than traditiona… |
|
|
Wireless IP Pan/Tilt/ Night Vision Internet Surveillance Camera Built-in Microphone With Phone remote monitoring support(Black) $44.68 Specs: Image Compression Format: M-JPEG standard Image Resolution: VGA(640×480) / QVGA(320×240) Sensor: 1/4 inch CMOS, 300,000 Pixels Light frequency: 50Hz, 60Hz or Outdoor Audio compression: ADPCM Data rate: 802.11b: 11Mbps (Max.), 802.11g: 54Mbps (Max.) Ethernet: One 10/100Mbps RJ-45 Viewing angle: 67? Horizontal Rotating Angle: 0~270? Vertical Rotating Angle: 0~120? Alarm Mode: motion detection… |
|
|
Honeywell RCWL300A1006 Premium Portable Wireless Door Chime and Push Button $29.95 The Honeywell RCWL300A P3 Premium Portable Wireless Door Chime and Push Button makes it easy to replace your home’s generic doorbell ring with a chime tune that better fits your individual style. This chime is also compatible with a wide range of optional security accessories that can help you safeguard your home and family, and it comes complete with a pre-programmed bell push button. .caption … |
|
|
The Good Wife: The First Season $16.82 Brand New! Original Factory Sealed… |
|
|
Rear Window (Collector’s Edition) $9.97 Confined to a wheelchair after breaking his leg on an assignment, photojournalist James Stewart’s “hobby” of spying on his neighbors with a telephoto lens leads him and girlfriend Grace Kelly to believe that one of his subjects may be a murderer. One of Hitchcock’s personal favorites, this innovative suspense classic also stars Thelma Ritter, Raymond Burr. 115 min. Widescreen (Enhanced); Soundtrac… |
|
|
9/11 – The Filmmakers’ Commemorative Edition $12.37 Originally broadcast on CBS in March 2002, 9/11 is an extraordinary record of that fateful day in New York City. This one-of-a-kind documentary was originally conceived as a portrait of 21-year-old Tony Benetatos, a firefighter trainee at Manhattan’s Duane Street firehouse, located seven blocks from the World Trade Center. By the time filming was finished, brothers Jules and Gedeon Naudet had capt… |
|
|
AmazonBasics AA NiMH Pre-Charged Rechargeable Batteries BYD 8 Pack AAA NiMH Pre-Charged Rechargeable Batteries Product Features 8-pack 2,000 mAh rechargeable AA batteries for digital cameras, remotes, and more. Pre-charged and ready to use right out of the pack;Extremely slow self-discharge rate maintains 80% of capacity after 1 year of storage at 20â. Greater Power and Better Performance in lower temp than Alkaline.Combines best features o… |