AHD CCTV cameras, also known as Analog HD CCTV cameras, are capable of capturing video surveillance 720p high definition resolution (1280 x 720 pixels). 1080p resolution. AHD security cameras must be used with a AHD compatible DVR. Hawkseye CCTV Camera provides hybrid AHD / CCTV DVRs that work with both AHD and traditional analog CCTV cameras so that users can mix and match a combinations of both camera types.
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.
How High Definition Works
High definition video on IP cameras is often referred to as either 720p or 1080p. 1080p, or full HD resolution, records images that measure 1920 x 1080 pixels; 720p HD images measure 1280 x 720 pixels. The “p” in 720p and 1080p stands for “progressive scan,” which helps minimize blur caused by movement.
Older-style analog CCTV cameras measure image resolution in horizontal lines, called TVL. The higher the number of lines in an image, the higher the resolution. New IP cameras use different technology, and measure resolution through pixels. IP cameras can fit more pixels into an image than CCTV cameras can fit horizontal lines, giving you a higher quality image. HD IP cameras use even more pixels than non-HD cameras, giving you the best image quality available.
To use an HD camera for facial recognition, the face often needs to measure a certain pixel size. You will also need to consider the lighting and the angle the person is at while facing the camera—bad lighting or too sharp of an angle can make it hard to identify people. For more information on pixel count and facial recognition, speak with our surveillance experts for specific recommendations for your project.
HD cameras record images in a widescreen aspect ratio of 16:9, which means the image is larger and wider than a non-HD camera. This wider image is what allows you to potentially monitor the same area with fewer HD cameras, also allowing you to save money on and time on installation. Non-HD IP cameras often have an aspect ratio of 4:3
By recording video with more pixels in a wider aspect ratio, high definition cameras give you detailed images not available with CCTV analog or non-HD IP cameras.