WHAT IS IP, CVI, AHD AND TVI
IP HD CAMERAS?
An Internet protocol camera, or IP camera, is a type of digital video camera commonly employed for surveillance, and which, unlike analogue closed circuit television (CCTV) cameras, can send and receive data via a computer network and the Internet.
IP Cameras are the most commonly used Cameras in the Electronic Security Industry today, they are reliable and practical in terms of installation and all round functionality. Even more interesting is that they are becoming extremely affordable.
HD-CVI (High Definition Composite Video Interface)
In 2012, Dahua announced that they were in the process of developing their own HD CCTV standard and as a result, HD-CVI was born. So what is HD-CVI?
HD-CVI Is a very powerful technology that allows the end user to easily upgrade their old analogue system to an HD system without spending additional money, imagine the possibilities, there are billions of old analogue systems in the world, all waiting to be upgraded to HD quality at affordable pricing.
HD-CVI is for high definition analogue solutions with megapixel resolution and zero latency over longer distance video transmissions. According to Dahua, the name has to do with its baseband and quadrature amplitude modulation technology, which is able to avoid CVBS cross talk and separate the brightness and hue signals that further enhance the video quality. Their technology allows an extremely low signal distortion over long distance transmission with its patented Auto Signal Compensation (ASC) feature.
In short, the positive side is high quality megapixel images in both 720p and 1080p formats. The negative is that it is not compatible with other HD offerings.
HD-TVI (High Definition Transport Interface)
This also began development in 2012 through Techpoint and finally being acquired by Hikvision and a few other Chinese manufacturers for their offering in the HD CCTV market. HD-TVI also based on distance transmission using coax cabling, it converts digital signals to analogue ones and offering both 1080p and 720p resolutions. HD-TVI also offers zero latency allowing for real-time preview without delays. HD-TVI, due to its open source framework, is able to work with other manufacturers and therefore not restricted to one brand.
In short, the positive is its compatibility to work with other manufacturers and its affordable pricing, similar to 960H.
What is AHD CCTV? 960H vs AHD CCTV Camera
AHD CCTV is an analog high definition closed-circuit television video surveillance standard that uses coax cable to transmit HD video from security cameras to DVRs. AHD supports 720p and 1080p HD video resolutions. You can find different styles of AHD CCTV cameras here.
What type of cable do AHD cameras use?
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 RG59 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.
AHD vs 960H Video Resolution
The below images compare a video surveillance photo capture by a 960H CCTV camera with 720p and 1080p AHD CCTV cameras. The first two cameras where connected to an iDVR-E8 hybrid analog / AHD CCTV DVR to capture the images. The 1080p camera was connected to an iDVR-PRO AHD / HD-TVI / anlog CCTV hybrid DVR. When I first wrote this article, 1080p AHD cameras were not yet available. As of September 2015, I have access to 1080p cameras and the latest iDVR-PRO recorders work with analog, 720p and 1080p cameras (AHD and HD-TVI).
The analog and 720p AHD camera were both displayed full screen at 720p resolution when the image was captured. The 1080p AHD camera was displayed at 1080p resolution. Please click on the images to see a full size view.
960H Resolution Image
AHD Resolution Image (720p AHD)
1080p AHD Camera Resolution
NUMBER PLATE CAPTURE IN SEVERE CONDITIONS:
Illustration as below of number plate camera capture with Peak White Inversion Technology, or otherwise known as HLC -( High Light Compensation) Note: This was captured on an old Analogue camera, we will be posting an Illustration of an IP HD camera with HLC soon.