Question
Which is the detection distance for weapons with IVA Pro Visual Gun Detection?
Answer
The detection distance (based on the pre-defined requirements*) depends on the focal length and the size of the of the gun.
For example, using the FLEXIDOME 5100i 2 MP, with a gun size of 20 cm (7.9 in), the detection distance varies between 2.7 m (8.9 ft) (f = 3.2 mm) and 12.6 m (41.3 ft) (f = 10.5 mm), depending on the focal length as shown in the table:
|
Focal length |
Detection range (m) |
Detection range (ft) |
|
3.2 mm |
2.7 |
8.9 |
|
10.5 mm |
12.6 |
41.3 |
*Required pre-defined conditions: the scene must be well illuminated (at least 200 lux), the gun must cover at least 5% of the image height, less than 50% occluded and visible for at least one second.
**Evaluation based on video sequences: If a gun is detected at least once in the video sequence, it is considered an alarm.
Limitations
-
Detection requires the object to be occluded by less than 50%
-
Top-down view (bird's eye view) is not supported
-
Objects need to be visible for at least 1 second
-
Not available in corridor mode with 90° image rotation
-
Object color not available
-
Minimum object size of 36 ppf (pixels per foot) to ensure proper detection
