The CCTVDesign Camera Field of View Calculator is a free engineering tool that accurately calculates the field of view, scene width and pixel density of CCTV cameras. It enables designers, consultants, installers and end users to determine how much of a scene will be visible at a given distance and whether the camera can achieve the required level of operational performance.
Unlike simple field of view calculators that rely on basic estimates, the CCTVDesign calculator uses recognised optical equations to determine the horizontal field of view from the camera’s sensor size and focal length. This provides a more accurate representation of real-world camera performance and allows viewing distances to be assessed using the CCTVDesign OODPCVS methodology
Why Field of View Matters
Selecting the correct field of view is one of the most important aspects of CCTV system design.
A camera covering too wide an area may provide excellent situational awareness but insufficient image detail to identify individuals or vehicles. Conversely, a camera with a narrow field of view may provide excellent detail but fail to capture the wider scene.
Calculating the correct balance between coverage and image quality ensures surveillance systems are capable of meeting their operational objectives while making efficient use of camera hardware
Who is it for?
The calculator is designed for:
- CCTV system designers
- Security consultants
- System integrators
- Installation engineers
- Local authorities
- Critical infrastructure operators
- Facilities managers
- Security managers
- Students learning CCTV design principles
Features
- Horizontal field of view (degrees)
- Scene width at any distance
- Pixels per metre
- Maximum OODPCVS viewing distances
- Camera coverage based on sensor size and focal length
- Ground intersection limits when camera tilt is applied
Engineering Methodology
The calculations are based on recognised optical principles.
Horizontal field of view is calculated from the sensor width and focal length. From this, the calculator determines scene width at any distance and calculates pixel density across the viewed scene.
Where a camera tilt angle is specified, the calculator also determines whether the upper edge of the vertical field of view intersects the ground before the theoretical pixel-density distance is achieved. Where this occurs, the maximum achievable viewing distance is limited accordingly, providing a more realistic representation of installation performance.