What is an AHD Camera?
The AHD camera is a new closed-circuit television video surveillance standard that can utilize traditional coaxial cable to transmit HD images from cameras to DVRs. This is similar to the TVI CCTV system but offers higher resolution and supports longer cable lengths.
Unlike HD-CVI and HD-TVI which degrade over long distances, AHD can deliver quality images.
High Definition
High definition cameras are typically 1920p, 720p or 1080p in resolution and deliver superior image quality over standard analog CCTV. They provide sharp and clear images, with more detail in darker areas than standard analog cameras. They also have a wider dynamic range to better handle extremes of light and dark in a scene.
AHD cameras use the same infrastructure as traditional analog CCTV allowing it to be backwards compatible with existing 960H DVR’s. They also work over traditional coaxial cable up to 500 meters with the addition of video baluns and are compatible with ethernet cables for long distance applications.
AHD was developed by Nextchip and seems to have addressed some of the issues holding back the other HD analog technologies. It can work over traditional coaxial cable up to 500m and supports 720p or 1080p resolution depending on the camera type. Most AHD cameras support xvYCC color which claims to produce 1.8 times more reds, greens and blues than standard colors and offers more vibrant images.
However, AHD has some disadvantages as well. It’s not as universally compatible with other manufacturers cameras and DVR’s as CVI and TVI are. It’s also prone to false advertising as some manufacturers claim they are using AHD technology when they are not. It also has some technical limitations such as not supporting ethernet or IP protocol and not working with a traditional matrix system.
Wide Dynamic Range
This feature allows cameras to overcome excessive back lighting from a scene and improve image quality. It does this by adjusting the ahd hd camera amount of light the camera sensor is exposed to during exposure time. In darker areas of the image, the shutter is opened for a longer period of time, and in lighter areas the shutter is closed for shorter periods of time. This results in a compensated image that looks much better than one without WDR.
WDR is important for dash cams because it helps them perform better in low light conditions. This is because the images produced by cameras are very dynamic, and they can have both bright and dark portions. This can cause LCD monitors to not be able to reproduce these dynamic images, but WDR makes this possible.
When looking for an AHD hd camera, make sure it has this feature because it will allow you to see more of the image when using your dashcam at night or in other challenging situations. You can find this information on the product datasheet by looking for the term “WDR” and the dB rating, which is the ratio of the brightest part of the image to the darkest part of the image.
If you’re considering purchasing an AHD hd camera, be sure to check out our selection of HD cameras for sale. We have a wide variety of options to choose from, including weatherproof and dome models. They also have a range of features, such as auto-focus and night vision.
Low Light Performance
AHD cameras are capable of capturing more details even in low light conditions. This is a result of the camera’s lens, sensor and image processing technologies. For the lens, a larger aperture size increases the sensitivity of the lens, enabling it to capture more light and detail. The sensor is designed to reduce noise by utilizing advanced signal processing algorithms.
For example, a camera’s image processor may perform backlight compensation and 3D noise reduction to increase the clarity of the image. Additionally, some cameras are equipped ptz camera supplier with auto-iris technology to automatically adjust the lens aperture based on the amount of ambient light. This allows the camera to provide sharp and clear images in all lighting conditions.
AHD also has the benefit of being compatible with existing analog CCTV systems. Installers can use the same coax cable that is used for analog CCTV, as well as video baluns to extend the distance of the video signal.
Additionally, AHD cameras are capable of achieving up to 500 meters of transmission distance over traditional 75-3 coaxial cables. This enables installers to maximize the efficiency of their existing infrastructure and reduce installation costs.
Flexibility
The main advantage of HD-TVI and HD-CVI cameras over traditional analog CCTV models is that they can use the same BNC cables, RG59, RG6, or RG11. They also offer high-resolution video that can work with the existing infrastructure. Having the ability to upgrade to HD surveillance without having to re-wire could save time and money for security systems integrators.
These HD over coaxial technologies allow for a maximum transmission distance of up to 1000 feet or 300 meters. This can be increased with signal boosters or repeaters. They have the same image quality as analog CCTV cameras with 960H resolution. However, their advanced features and higher resolution may require more technical expertise to install.
Choosing the right HD over coax technology for your surveillance system is a critical decision. Considering the level of detail you need for your video footage, existing infrastructure, and budget constraints will help you select the best solution. By assessing these factors carefully, you can find the right analog HD over coax solution for your security needs. To ensure your video surveillance system is operating properly, we recommend using an AHD test monitor like this one. Click here to learn more about the MON-4HD AHD test monitor that we provide for our customers. It can connect directly to an AHD camera, allowing you to view the live image without a DVR.
