What does "field of view" measure in CCTV cameras?

The term "field of view" in the context of CCTV cameras specifically refers to the extent of the observable area that can be seen through the camera lens. This measurement is critical for determining how much of a scene will be captured and viewed in the footage.

A camera with a wide field of view can cover a larger area, which is ideal for monitoring expansive spaces like parking lots and public squares. Conversely, a narrow field of view is more focused and may be used for detailed observation of specific areas, such as entrances or cash registers. Understanding this concept is fundamental for effective surveillance system design, as it influences the placement of cameras and the number needed to ensure complete area coverage.

The other options do not accurately encapsulate what "field of view" means. For instance, sound capture pertains more to microphones rather than cameras. The distance recorded can be influenced by other factors, such as lens type, but isn't a direct definition of field of view. Lastly, the number of cameras required for coverage relates to the layout and design of the surveillance system, which is a separate consideration from the definition of field of view itself.