Camera requirements for the VI abandoned objects detection module are given in the table:
| Camera | - Pitch angle of the camera optical axis relative to the horizontal plane:
- at least 15 degrees for the inclined method of placement
- from 80 to 100 degrees for placement on ceiling
- Resolution is from 640x360 to 1920×1080 pixels
- Resolution can be:
- lower for close-up scenes (2–7 meters for cameras with standard focal length) without loss of recognition quality
- higher for scenes far from camera (from 10 meters)
- FPS is at least 25
- Color image only
|
| Lighting | - Lighting in the scene is from 100 to 1000 lux
|
| Scene and camera angle | - Shooting distance is from 5 to 30 meters
- Density of people flow is no more than one person per square meter
- Volume of the abandoned object is from 3 cubic decimeters
- Background texture: moving, random and inhomogeneous background with contrast variations from 0.2 to 0.8
|
| Object images | - For abandoned objects, the optimum density is 100 pixels per meter
- Maximum signal-to-noise ratio (without the function of automatic signal amplification) is at least 42 dB
- Resolution of the video image is at least 1280x960 pixels
- Image isn't noisy and isn't distorted by artifacts of the compression algorithm
- Distortion is no more than 10% (at the edges of the frame—at a distance of one third from its center in width, height and diagonal)
|