H12-511: HCIA-Intelligent Vision

Intelligent video surveillance supports video-analytics functions such as people counting and abnormal-behavior detection, and it can associate detected events with alarm actions and automatically report alarm events.

Optical fiber provides very low signal attenuation and high bandwidth, allowing video and control signals to travel dozens of kilometers without a repeater in typical installations.

DVR camera capacity and NVR camera capacity depend on the recorder model and its specifications. DVR systems conventionally use analog cameras and convert the incoming analog footage to digital form for recording and storage. NVR systems use IP cameras, which encode video at the camera; the NVR receives, records, and stores that digital footage. Thus, both types store video, but only the DVR must encode the analog input for storage.

Long-focus lenses generally produce a smaller, shallower depth of field, whereas wide-angle lenses generally produce a larger, deeper depth of field under comparable shooting conditions.

A larger CMOS image sensor has more area to collect incoming light, generally improving light sensitivity and low-light imaging performance when comparable technology and conditions are used.