Image resolution is an important fact when users plan to setup video surveillance systems. Generally, the higher resolution, the higher image quality, this means captured video can provide detailed information, which can be very useful to identify people face, vehicle plate number, money transaction, etc.
Although IP solution prevails in today's market, many users still decide to choose HD analog solution,because the current AHD/HD-TVI/HD-CVI HD analog products allow users easily setup a HD video surveillance system by simply replacing the existing 960H analog products. Unifore, as the leading video surveillance manufacturer, we are dedicated to providing Full HD 1080p analog cameras that based on AHD/TVI/CVI solutions.
Which is better among AHD, HD-TVI, HD-CVI? this is a frequently asked question from our clients. Actually, these HD analog solutions are quite similar, all of them utilize megapixel CMOS image sensor to deliver high definition image, while transmitting uncompressed video signal over coaxial cable. Compared with HD-TVI and HD-CVI, AHD is open technology to all manufacturers, AHD cameras and DVRs are affordable and popular. To know the difference between these HD-over-coaxial solutions, you can read the article: Analog HD technologies - AHD, HDTVI, HDCVI, ccHDtv, HDMDI
AHD stands for analog high definition, it's a new high definition video surveillance system that combines the simplicity of analog technology with high resolution available in digital IP systems. AHD cameras can deliver uncompressed, high resolution video (720p, 1080p) over coaxial cable. Using the AHD cameras and DVRs allow user to get high definition image quality without replacing the existing coaxial cable. Compared with IP systems, as the video signal is not compressed,the picture is more natural during live viewing in comparison to an equivalent decoded from IP stream. Moreover, AHD can provide no delay real-time video monitoring, and the configuration of such a system is easier.
High Definition Transport Video Interface (HD-TVI) originally comes from Techpoint USA, HD-TVI security cameras support HD video resolution up to full HD 1080p, frame rate up to 30fps, transmission distance up to 500 meters of coaxial cable. According to the chipset supplier Techpoint, HD-TVI chipset has been supplied to many manufacturers including Hikvision, TVT, AVTech, IDIS, etc.
HDCVI ( High Definition Composite Video Interface) is a solution for megapixel high definition applications, featuring non-latent long-distance transmission at a lower cost. The name has to do with its base-band and quadrature amplitude modulation technology, which is able to avoid CVBS cross talk, completely separate brightness and hue signal, and further enhances video quality.
Currently, we have 720p, 960p, 1080p three main different image resolution in AHD/TVI/CVI products. In television broadcasting and video surveillance industry, 720p and 1080p belong to HDTV standard. 1080p means a resolution of 1920x1080, or 2MP (2 Megapixel). 1080p is the highest resolution among them, a full high definition image is two times larger than 720p image. Although 1080p cameras are better in terms of image quality, using 720p cameras can offer you some other benefits. The cost of 720p cameras is lower and the image quality is still impressive. Lower resolution will take up less space and give you longer history.
Motorized Lens— Controlled remotely, easy to refocus! For HD cameras, lens could be easily out of focus due to heavy rain,wind or any other vibrations, which would require installers to refocus the lens every 2-3 months. When using normal lens, installers would have to be on site to adjust the lens, but with Motorized Lens, installers could just re-focus the lens remotely in control room.
4IN1 cameras allow user to choose different video signal formats by pushing the joystick. Pushing the Joystick to the selected direction and hold for 5 seconds; e.g. Push the Joystick to "H" and hold for 5 seconds, the video signal will be switched to AHD mode.
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