CCTV Lens & FOV
Enter the distance to the target, the sensor, the focal length and the horizontal resolution and get the HFOV, the scene width, the px/m and the DORI level (EN 62676-4) reached, with the maximum distance for detection, observation, recognition and identification.
Maximum distance per DORI level
| Level | Threshold | Max. distance | Status at D |
|---|
Status at D shows whether the threshold of each level is
met at the entered distance.
How it is calculated · FOV, px/m and DORI (EN 62676-4)
1. Horizontal field of view:
HFOV = 2·atan(sensorW / (2·f)) · 180/π, with the sensor
width and focal length in mm.
2. Scene width at distance
D: width = D · sensorW / f (in metres, with
D in metres).
3. Density:
px/m = horizRes / scene_width. More pixels on the
target means more detail.
4. DORI thresholds (EN 62676-4, px/m):
Detection 25, Observation 63,
Recognition 125, Identification 250.
5. Maximum distance for a level:
Dmax = horizRes · f / (threshold · sensorW). Up to that
distance the required density is kept.
Runs locally in your browser · no sign-up · nothing leaves your browser.