Bugs 20EIS User Manual
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The measuring precision of optical flow system will be affected easily by the light strength
and the features of object surface texture. Once the optical flow is unavailable, the aircraft
will enter to altitude-holding mode automatically. Please be cautious in as following situations:
1. Fly fast at an altitude below 0.5m.
2. Fly over monochrome surfaces (like pure black, pure red, pure red and pure green).
3. Fly over strong light reflective surfaces or surfaces prone to reflection.
4. Fly over water or transparent object surfaces.
5. Fly over moving object surfaces (such as crowds, swaying juggles and glass).
6. Fly over an area where light changes dramatically and rapidly.
7. Fly over surfaces extremely dark (lux<10) or extremely bright (lux>10,000).
8. Fly over surfaces without clear textures.
9. Fly over surfaces with highly repeating textures (small grid brick in the same color).
10. Fly over surfaces that are tilting over 30 degrees.
11. Flying speed should be controlled not to be too fast. When the aircraft is 1 meter against
the ground, the flying speed should not be over 5m/s; When the aircraft is 2 meter against
the ground, the flying speed should not be over 14m/s.
● Keep sensors clean at all times.
● The vision system is only effective when the aircraft is within the altitude range of 3 meters.
● Make sure that the light is bright enough and the surfaces is with clear textures so that the
vision system can acquire the movement information through recognizing the ground textures.
● The vision system may not function properly when the aircraft is flying over water, low light
ground and surfaces without clear patterns or textures.
● If the light is dim, please turn on the optical flow supplement light.
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