Common Misunderstandings about IP Surveillance System
Grace Liu
www.mvteamcctv.com
2016-11-08 16:06:41
People who know less about surveillance products often have below misunderstanding about IP surveillance system.The common misunderstandings maybe misguide you to choose a improper system.Here will list the three common misundersandings for your reference.
Table 1:Resolution and recommended corresponding code stream
Misundersanding 2:All ONVIF IP Cameras and NVRs are compatible
In the era of pursuiting personalization,some consumers want to combine different brands surveillance products according to their own preferences.They think as long as the products supports ONVIF, then can achieve interoperability, compatible use and unified management.However, not entirely correct, if the front-end cameras and back-end NVRs belong to different brands, although most of the functions can be achieved thru ONVIF protocol, but due to the limitations of public agreement, the back-end part will can not operate some functions of cameras.For example: IP address changes, parameter settings, alarm linkageetc., need professionals staff do the settings thru CMS or IE browser.
Misundersanding 3:The bigger focal length of lens, the better
People often want to buy the cameras which can see far, wide, and also must be clear.However, different lens only can achieve the best results within a certain range.For example, focal length of home surveillance cameras are usually divided into 3.6mm, 4mm, 6mm, 8mm, 12mm etc., 3.6mm lens is a wide-angle lens with wider monitoring range fit for a small space,But in open space,wide-angle lens maybe even can not see faces clearly; If want to see the faces, need select the bigger focal length lens which fit for corridors ; Of course, the choice of how much focal length of the lens mostly are decided by the monitor distance.If the monitoring area is with longer distance and wider range, then it's better to increase the number of cameras.
Misundersanding 1:The higher the resolution, the better
Do not blind pursuit of high resolution, high resolution requires high code stream support to be achieved(refer to table 1). The higher the resolution, the larger the code stream, the more hard disk occupied per unit time.Some manufacturers advertise the "high-resolution, low stream" to attract people's attention, but if frames is not enough,image will delay longer time,then high resolution is no use.Secondly, the resolution determines the night vision image quality? actually not, night vision effect is mainly determined by the sensitivity of CMOS chips.
Do not blind pursuit of high resolution, high resolution requires high code stream support to be achieved(refer to table 1). The higher the resolution, the larger the code stream, the more hard disk occupied per unit time.Some manufacturers advertise the "high-resolution, low stream" to attract people's attention, but if frames is not enough,image will delay longer time,then high resolution is no use.Secondly, the resolution determines the night vision image quality? actually not, night vision effect is mainly determined by the sensitivity of CMOS chips.
| Format | Resolution | Pixels | Recommend Bandwidth |
| 720P | 1280*720 | 1MP | 2M |
| 1024P | 1280*1024 | 1.3MP | 3M |
| 1080P | 1920*1080 | 2MP | 4-5M |
| 1536P | 2048*1536 | 3MP | 5M |
| 4K | 3840*2160 | 8MP | More than 8M |
Misundersanding 2:All ONVIF IP Cameras and NVRs are compatible
In the era of pursuiting personalization,some consumers want to combine different brands surveillance products according to their own preferences.They think as long as the products supports ONVIF, then can achieve interoperability, compatible use and unified management.However, not entirely correct, if the front-end cameras and back-end NVRs belong to different brands, although most of the functions can be achieved thru ONVIF protocol, but due to the limitations of public agreement, the back-end part will can not operate some functions of cameras.For example: IP address changes, parameter settings, alarm linkageetc., need professionals staff do the settings thru CMS or IE browser.
In addition, there maybe ONVIF docking problem between different brands products and some uncertainties factors still there. Therefore, considering compatibility issues, it is best to buy the same brand products, because the private protocol docking is the best choice.
Misundersanding 3:The bigger focal length of lens, the better
People often want to buy the cameras which can see far, wide, and also must be clear.However, different lens only can achieve the best results within a certain range.For example, focal length of home surveillance cameras are usually divided into 3.6mm, 4mm, 6mm, 8mm, 12mm etc., 3.6mm lens is a wide-angle lens with wider monitoring range fit for a small space,But in open space,wide-angle lens maybe even can not see faces clearly; If want to see the faces, need select the bigger focal length lens which fit for corridors ; Of course, the choice of how much focal length of the lens mostly are decided by the monitor distance.If the monitoring area is with longer distance and wider range, then it's better to increase the number of cameras.
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