What is the Difference Between TVI camera Vs AHD camera…. ??
TVI or AHD. This is a common question asked by CCTV Camera Pros customers. TVI and AHD are two different HD CCTV camera technologies that support 1080p resolution over standard coax cable (RG59 or RG6). This is the same type of coax cable that is used in traditional analog CCTV camera installations.
ANALOG SURVEILLANCE SYSTEMS
Analog systems are what began the surveillance industry and are still around today. They feature a low cost, low resolution, easy alternative to IP but with mixed results. Analog cameras are usually listed with an X number of TV Lines. You’ll often see 600, 700, 800 TVL and occasionally 960H with the higher the number generally being the better choice. With the higher number being better you are ultimately limited to a maximum pixel count of 960×480 (960H) which is not high definition by any means. Analog DVRs and cameras are mostly interchangeable meaning you can mix and match cameras and DVRs from different manufacturers.
However, this easy setup-low cost alternative comes with a few downfalls when compared to newer technology. Low limited resolutions provide a mediocre image which can often be pixelated and grainy. A maximum resolution of 960H is the highest possible or 960×480 to be exact. Think of a high definition 1080p TV with a resolution of 1920×1080, when comparing the two, 960H provides much less detail and quality. This often results in less arrests and convictions due to specific features not being distinguishable on captured video.
AHD CCTV camera
AHD CCTV cameras are connected to DVRs using the same type of coaxial cable as traditional analog CCTV cameras, typically RG59 or RG6 coax cable. One of the advantages of AHD over HD-SDI cameras (another HD over coax security camera standard), is that RG59 coax cable can be run long distances without video loss. So far in our experience, installers can reliably use RG69 coax cable up to a max distance of 800 feet for AHD cameras. AHD cameras can also use UTP cable with video baluns to run cable up to 320 Meters / 960 feet with CAT5 cable.
Results / Opinion
The TVI camera is slightly sharper than the AHD in my opinion – both in daytime and infrared night vision mode. It is really close though. However, I like the color brightness of the AHD camera better than the TVI.
Something important to note is that the angle of view of the TVI camera is slightly more narrow / zoomed in than the AHD. If you compare the right edge of the images, you will notice that the AHD camera’s view extends a few feet past the end of the warehouse shelf. The TVI camera cuts off the edge of the shelf slightly. This is interesting because both have a 2.8-12mm lens, and I adjusted both to the widest setting – 2.8mm.
This may be why the video from the TVI camera is slightly more clear. Also, I may not have perfectly focused the AHD camera. It is hard to get the focus perfect on any camera. Maybe the AHD camera was just off a touch.
So, for this test, I give a very slight edge to the TVI camera on clarity, but like the colors better on the AHD.
Both TVI and AHD cameras provide an amazing value for 1080p resolution over coax type cameras (HD CCTV). CCTV Camera Pros will continue supplying and recommending both camera types. It is honestly too close to call.