Cameras design and procurement guide

This Guide can help monitor the implementation of projects. According to all solutions based on the parameters of cameras, the application environment and the place, it will help you to choose the best cameras, to meet different needs of security monitoring project solutions.

Security Monitoring

With the widely use of the monitoring system,the kinds of camera (brands,types and models) are growingly diversified. As a monitory design and installation projector,its system designers and procurement managers,determines their minds to do something facing so many cameras. How to choose the right camera to ensure the best system and the lowest cost?These questions plague many design engineers and procurement managers.

Perhaps this article is helpful for the engineers facing problems. In order to make good on this issue,let us start with some basic knowledge for the CCD camera:

• 1.Classified according to color of the image
• 1.1 Color Camera: Applicable to the detailed features,such as clothing or color of the things
• 1.2 Black-and-white camera: Applicable to the dim areas and areas lighting equipment cannot be installed in. Just watch the location or movement of the scenery,they can choose black-and-white cameras.
• 2. In accordance with Resolution
• Imaging sensitivity less 380,000 pixels is general type,especially 250,000 pixels (512*492),400-line resolution of this kind of cameras are the most common products. Pixel images more than 38 million pixels is the high-resolution type.
• 3. Divided by the camera shapes
• The shapes of the camera are: box cameras,pinhole cameras,and Doom cameras.
• 4.According to the surface size of CCD
• 1 inch--the size of the surface of CCD: width 12.7*high 9.6mm,16mm diagonal.
• 2/3 inch -- the size of the surface of CCD: wide f/3.2*6.6mm ,11mm diagonal.
• 1/2 inches -- the size of the surface of the CCD:width mm*4.8mm ,8mm diagonal.
• 1/3 inch -- the size of the surface of the CCD:width 4.8mm and 3.6mm*,6mm diagonal.
• 1/4 inch -- the size of the surface of the CCD:width 3.2mm*2.4mm,diagonal 4mm
• 5.Divided by scanning system PAL. NTSC system.
• 6.Divided by power source
• 220VAC,PAL system.
• 24VAC.
• 12VDC,Most of the domestic cameras belong to this kind 7,by synchronous mode
• Internal synchronization: the internal synchronization signal circuit's synchronous signal operates. External synchronization: external synchronization signal generator sends synchronized signal into the camera external synchronization input. Power synchronization (lock line): AC power completes vertical synchronization. Synchronous outside VD: Make VD synchronous pulse of the camera signal cable input to complete VD synchronization.
• 2,CCD color camera's basic knowledge, The main technical specifications:
• a. CCD size,the camera's surface: Now 1/3 inches have been universal,and 1/4 inches has been commercialized.
• Bathe more pixels,the higher the image resolution,the more clear. Now more than 25 million and 380,000 pixels is the limit,more than 380,000 pixels are the high-definition cameras.
• c.Horizontal resolution. The typical resolutions of the Color Camera are 320 between 500 TV lines,currently,420 TVL resolutions and 480TVL dominate the market.
• d.The minimum illumination,also known as sensitivity. Moon and Star high-sensitivity cameras can work in dark conditions,but for the general cameras,2 ~ 3lux is the lowest illumination. Now 1lux ordinary cameras are more widely available and the most commonly used.
• Scanning system: PAL. NTSC system.
• Power source: alternative 220V、110V、24V,direct 12V or 9V.
• 1. Signal-to-noise ratio. Typical S/N ratio is 46 db,if it is 50 db,images has a small amount of blots,but good image quality,If 60 db. Image quality is excellent.
• 2.Video output. Most of them are 1 Up-p,75 Ω,and adopted BNC connector.
• 3.The camera installation. C and CS,the differences between them is photosensitivity.
• 3.Camera selection tips
• In the Application of monitoring system,the camera selection is crucial;it directly defines the whole monitoring system images. Now,we talk about the selection of camera in different occasions,for your reference.
• Cameras chosen are based on two main elements: One is the environment (applications). Another is camera specifications.
• Camera applications -- the selection of the camera
• Currently,cameras are more various,and applications also varied. Application occasions decided the type of cameras,to choose the right camera,we must understand the installed places,and determine the installation type. Currently,cameras installed applications are: office buildings,hotels,factories,banks,prisons and so on. Cameras are also generally divided into indoor and outdoor use. We take installing the monitors in hotel as an example to explain it. Under current practice,their front-end camera installation locations are: lobby,elevators,stairways corridors,car parks.

The specifications:

After selecting cameras' type,we also should considerate the application environment to determine the specific of the camera,and then select camera's models. Generally,the main camera specifications are: clarity,the lowest light,and the other specifications

Clarity: at present,330 TVL --- 480TVL cameras are the majority in the market. Under the current application of the camera,420TVL are most prevalent,and 480TVL high-definition cameras take second.

Lowest light: the lowest light is the minimum light required by camera working condition. It is also a choice of camera parameters.

Take the hotel as the sample:

The applications for various cameras

List some most suitable places for some cameras: