HD security cameras, also known as HD CCTV cameras, are capable of capturing high definition video surveillance footage up to 1080p resolution (1920 x 1080 pixels). This page contains two types of HD of coax cable type security cameras: AHD and TVI. CCTV Camera Pros equally recommends both camera types and we have surveillance DVRs that work with AHD, TVI and analog CCTV cameras. However, some other DVRs only work with one or the other type which is why we carry both.