This Cctv Buyers Guide provides a farranging summary of deploying a prosperous video watch camera theory in your business or residence. This guide contains facts to help in the build of your video watch system, take the products that best fit your Cctv theory requirements, and help make key premise decisions that will save you time and money.The facts was derived from deploying 100's of Cctv systems and gathered from Cctv call centers who rejoinder questions from commercial and residential customers. This guide combines the data from past Ctv projects and gives the reader a head-start in the prosperous Cctv project
There are many details to reconsider when specifying the definite Cctv Camera System. Pro Video watch is not a cheap effort and a budget should be outlined and the best inherent theory should be considered. This guide will help the novice Cctv buyer in reviewing camera and recording theory for their Cctv and Video watch requirements.
Optical Encoder Circuit
The first task in a prosperous Cctv scheme is to frame the key Cctv objectives.
o How many cameras are required?
o What are the key FoV (Field of View(s))?
o What are the recording requirements?
o What are the lighting conditions of each camera location?
o Where do I need live video monitoring or a second video monitor?
o How long do you need to support the video files?
Cameras There are definite cameras that need to be prime based on the FoV, lighting conditions, and the mounting location of the camera. There is no such thing as a one-size fits all in the prosperous Cctv project. It is foremost to note each camera location and take the camera best great for that location.
Answer these questions:
o Indoor or Outdoor?
o Lighting conditions (during day and night)?
o Mounting locations?
Indoor Dome Camera
The indoor dome camera is used in 90% of general indoor applications. It comes in a variety of configurations including approved color, Day/Night, and Infrared versions. It can be mounted on a horizontal or vertical face but is typically ceiling mounted. Lens options on dome camera may restrict their use in positive applications such as requiring more than a 20mm video lens. Dome cameras are a customary option in indoor camera locations.
Box Camera
A box camera is a approved camera that can be mounted alone or in an enclosure. The box camera uses a isolate lens that screws on to the front face and provides flexibility for different FoV requirements and is sold without a lens. An auto-iris lens will have a small cable that connects to the camera for iris operate in assorted lighting conditions.
Outdoor Dome Cameras
Outdoor Dome Cameras are typically hard shell vandal-roof casings that offer the same versatility in a variety of lens options. Day/Night outdoor dome cameras are coarse in applications that have entry and exit points with wee lighting while the night.
Day/Night Camera
The Day/Night camera is the best option for low-light conditions. The cameras are approved color while daylight conditions, the Day/Night camera switches either digitally of mechanically to a low-lux B/W mode.
Infrared Camera
During No-Light conditions, Infrared cameras supply infrared illumination of the FoF allowing monitoring of areas with no light available. Te Ir Leds are automatically illuminated and the camera switched to the B/W low-lux mode contribution camera views in total darkness.
Ptz Camera
Pan-Tilt-Zoom camera offer the quality to view in all directions and optically zoom in as required. Ptz cameras also contain approved color, Day/Night modes, and a few Ir Ptz cameras have been introduced recently. The Cctv operator can set the Ptz cameras to automatically rotate to different FoVs. Options contain Auto-tracking applications that dynamically track objects in defined areas.
About the Camera technology
Sony Ccds are the predominate video element in protection cameras today. Sony makes few cameras, but they own the Ccd market. Do not think that Sony makes the camera touted as " Sony 1/3" Super Had Camera" as many vendors advertise their cameras. The camera has a Sony Ccd, however the camera is not from Sony and could be roughly any brand camera out there. foremost factors of lens quality, vari-focal and auto-iris ability, quality of camera housing or enclosure, and lens optics are the disagreement in a Pro Cctv camera.
Facts about Cameras:
o If you buy an camera, you will get an view.
o 480 Tvl should be a minimum requirement in any Pro Cctv project.
o Location of the camera and the definite lens are keys to quality video capture
o Cameras love light and thieves hate the light! Add lighting wherever possible
Camera Enclosure
Box cameras can be mounted in a variety of enclosures. Outdoor enclosures in cold climates should contain a heater/blower that keeps frost and condensation from forming on the lens and camera. Heater/Blower are generally 24Vac and should be thought about when choosing the Cctv power supply system.
Camera Location
Camera mounting location is principal to the success of the Cctv project. Cameras should be mounted as close inherent to the field of view required, and the closer the camera to the branch the great the identification of the branch will be. Allowable lens option relative to the camera location and the FoV required is principal to a quality picture.
Digital Video Recorders
Dvrs are an foremost part of any prosperous Cctv project. Video resolution is getting larger, recording speeds are getting faster, and video data compression is reducing the video data file size. TeraByte warehouse capacity is becoming coarse in many Cctv applications. Network or remote monitoring of Cctv video is approved in all Pro Dvrs on the shop in 2007 and video distribution over Lans, Wans, and the Web have given the Dvr a new shop face of video protection known as business Systems Monitoring that allows administration to monitor specified key business areas 24 hours a day. No longer just a protection video recorder, the Dvr has become a business tool for administration with remote monitoring applications.
In order to choose the definite Dvr for any application, the following questions need to be answered.
o How many channels (cameras)?
o What speed of recording is required?
o How long to support video files (Hard Drive Size)?
o What features are foremost to the application?
o Where will Dvr theory be located?
o Remote monitoring requirements?
In choosing the right Dvr for your Cctv application, ensure that you are determining the quantity of cameras needed now and in the next 24 months. Dvrs come in 4, 8, 9, and 16 channel increments and this option is principal because adding cameras above the Dvr channels available will need an supplementary Dvr, not just supplementary channels. Dvr systems in large installations are segmented into 16 channels units and are monitored and managed straight through a Central administration System.
The speed of recording is principal to many Cctv applications. 30 fps (frames per second) is thought about real-time video, therefore to gain 30 fps for the application, 480 fps for 16 channels and 240fps for 8 channels is required. Many Cctv applications will supply real-time (30 fps) live viewing of video channels and 7-15 fps for recorded files. It is approved to have 7-15 fps for recorded files in many applications, but technology in Dvr systems has pushed real-time video for the masses and 30 fps recording will soon be the approved recording rates over all channels as available today.
Storage of vide files is much easier and cost sufficient in 2007 than ever before. Dvr warehouse at the TeraByte level is coarse and drives have become faster and more reliable. Retention of video data files can be managed by corporate It departments as any business principal data and network drive archiving is common. All of the top Dvr systems have Usb ports for external warehouse devices and Lan-based video servers are common. A principal component of any Dvr theory is the quality to way the video files. The software provided by Dvr manufacturers is rights to the Dvr unit and the quality to retrieve files chronologically or based on positive protection events is vital to the Dvr product.
Pc-Based vs. Standalone Dvrs
Standalone Dvr systems were the majority of video recorders sold in the marketplace up until 2006. Computer-based Dvrs have become increasingly beloved due to the cost and features supply in the most recent generation of Dvr cards on the shop in 2007. The Windows Xp Pc computer is providing the reliability and carrying out in today's Dvr systems that are required for mission principal video protection systems. The open architecture of Pc-based Dvr systems allow easy integration into corporate Lans and technology upgrades are at a component level. Software upgrades and hard drive warehouse additions are far less costly that rights Dvr systems. Standalone Dvrs are imbedded recording systems regularly operating under Linux Os. The standalone Dvrs are widely used in sell protection sites and supply dependable video recording for 4-16 channels. Most Dvrs on the shop offer network remote way and Cd R/W archiving.Computer-based Dvr systems are reliable, fast, and have many advanced applications not found on standalone systems.
Video compression
Mpeg4 and H.264 are the video compression of option in 2007. In summary, Mpeg4 is good and H.264 is better. The key to video compression is the resolution and the size of the video. High resolution video files are monster size files and video compression for warehouse and streaming is principal to any video application. Major advancements in video compression will be seen in 2007 and H.264 will be the codec of option for Dvr manufacturers.
H.264
This uses the most recent innovations in video compression technology to supply high resolution video quality from the smallest amount of video data required. Smaller files will save bandwidth and warehouse costs over former generations of video codecs. H.264 delivers the same quality as Mpeg-2 at a third to half the data rate and up to four times the frame size of Mpeg-4 Part 2 at the same data rate. H.264 is used in the most recent video devices for High Definition video devices, BluRay Dvds and should be thought about for any Pro Cctv project.
Network way and Remote Viewing
Network way is the quality to remotely monitor a video server over the Lan, Wan, or internet. A very foremost application for any Dvr theory is the quality to monitor live and way to recordings straight through remote access. Most Dvrs today have a Lan Rj45 connection that allows the Video Recorder to connect to the Lan just like any other Pc in the office.
Advanced Dvr Features
Many Cctv systems are releasing advanced protection and specialty software for protection enhancements. These include:
o Object counting
o Pos Integration
o Ptz Auto-Tracking
o Face Recognition
o way operate Integration
CctV Cabling and theory Layout
Dvr Location In choosing the optimal location for the Dvr system, reconsider the way of the area for centralized operate and protection of the area. The Dvr is the heart of the Cctv theory and should be protected as principal to ensure it is safe from theft or damage. If the protection breach includes theft of the Dvr component, all evidence is carried off under the arm of the thief. And the thieves know this, so ensure that the Dvr theory is in a lock-box or an approved gain area.
Camera Power supply
Each Pro camera requires either 12Vdc or 24Vac. Both power options are approved and some Cctv installations will need both. Central Power Supplies are available in 4,8,16 and more channels.
Cable Options
Traditional video cable is Rg59 coax cable. Siamese dual cable is generally used that provides Rg59u coax together with a pair of 18 gauge wire for the camera power requirements. The dual cable allows particular cable runs to each camera for both video and power.
Cat-5 Options
Utp (twisted pair) cabling is becoming more beloved with Cat-5e/Cat-6 cabling used in networks. Cat cabling is lighter and less costly than coax cabling and requires balun connectors to match the impedance of the video signal. Coax and Utp connections up to1000' feet are acceptable. A balun is used to match the impedance on Cat-5 connections on the Dvr and camera connections.
The prosperous Video watch Project
o quality Plan
o quality Cameras
o quality Dvr
o quality Installation
Author: Steve McNeal
Ama Security
2/17/2008
Best Practices of Cctv - Implementing flourishing Video safety Systems