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5.2
Noise Factors
5.2.1 Ambient Light
Because the ToF distance measurement relies on the reflection of light sent out by the
camera, any additional light, e.g. artificial light sources or sunlight, may influence the
measurement results.
A strong ambient light may affect the accuracy and precision of the depth data, the
Vzense DCAM500 is suggested to in user below 50K LUX ambient light.
5.2.2 Multipath Propagation
Based on the principle of ToF, Multipath effect may happen when the light reflected
more one once. Any light that has been reflected several times, by other objects in the
camera’s field of view or the environment can cause deviation to the measurement
result.
To eliminate the multipath effect, you should:
1. Keep the camera working environment as clean as possible;
2. Avoid the camera be placed at concave forms environment, like corners of a room
or inside of a narrow space;
3. Highly-reflective object shall be removed far away from the measurement target;
5.2.3 Reflectivity of the Target
Please note that different reflectivity of the target may cause measurement result
deviation, objects which have 20% to 80% reflectivity to 850nm or 940nm infrared
light have the best result.
