Field of View (FoV) refers to the visible area a camera can capture at any given moment. It is usually measured in degrees and is influenced by the cameraās lens type, sensor size, and mounting position. A wider FoV captures more area but less detail, while a narrower FoV captures a smaller area with more detail.
Why Field of View Matters in Surveillance
In video surveillance, FoV plays a crucial role in system design and camera placement. Selecting the right FoV ensures optimal coverage of the target area without leaving blind spots or sacrificing image clarity.
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Wide FoV (e.g., 90Ā°ā120Ā°): Ideal for monitoring open spaces like parking lots or lobbies.
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Narrow FoV (e.g., 30Ā°ā60Ā°): Best for focusing on specific points like entrances or corridors.
Key Factors That Affect FoV
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Lens Focal Length:
Shorter focal lengths = wider FoV.
Longer focal lengths = narrower, zoomed-in FoV. -
Sensor Size:
Larger sensors increase FoV.
Smaller sensors reduce it. -
Camera Placement:
Height and angle impact how much area is visible and how itās recorded. -
Aspect Ratio:
The image shape (e.g., 16:9 or 4:3) affects how the field is captured.
Use Cases
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Perimeter Monitoring: Wide FoV to cover large boundaries.
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Facial Recognition: Narrow FoV to capture fine details.
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Retail Surveillance: Balanced FoV to monitor both aisles and entrances.