Hello, we find the Persee and Astra Cameras look extremely promising!
We have got some questions however about technical specifications that we haven’t found anywhere on the web sites but which would be very good to know. These would really help us evaluate the sensor.
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Accuracy at different ranges:
The tech specs quote accuracy of up to 5mm at a 2m range. Can you provide a graph showing the accuracy of the sensor at different ranges (i.e. 1m, 2m, 3m, …, 8m)?
Also we’d like to confirm whether the quoted values are indeed accuracy and not precision values (common pitfall with other sensor manufacturers). -
Calibration: Do the Persee and Astra-Sensors come pre-calibrated? Is there an API to query focal lengths, optical centers and lens distortion parameters from the sensor?
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Measurement Stability (environmental factors): How does temperature and other environmental factors (humidity, etc…) affect the measurement accuracy? Does the sensor perform any form of temperature distortion compensation?
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Measurement Stability (other): Will the measurements be stable over time (i.e. does the sensor accuracy degrade over time)? Does the sensor need a “warmup period” to deliver maximum accuracy?
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Surfaces: Any surfaces that can’t be captured (I assume reflective surfaces would be a problem)? Can black surfaces be captured?
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Can the sensor withstand mild shocks and bumps without losing accuracy?
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Are the color and depth images registered (i.e. a pixel position in color and depth corresponds to the same physical point) and synchronized (i.e. depth and color have been taken at the same point in time) on the sensor?
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Daylight capabilities: How sensitive are the Astra and Persee sensors to daylight? Can I capture outdoors when the sun is not shining (dawn/dusk, cloudy)?
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Working principle: Are the Astra / Persee cameras based on Structured Light or “Assisted Stereo” working principles?
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Weight: How much do the Astra and Persee Cameras weigh?
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Eye safety: Are the sensors eye safe (I assume yes but just double-checking)? Which Laser class?
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Is there any taxation of the host processor during frame capture (i.e. for frame decoding, conversion, etc…)?
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What are the power requirements for the Persee and Astra sensors? Can the Persee or Astra sensor be powered over USB? If not, are there battery options?
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Can a Persee or Astra sensor be connected to a mobile device through a USB OTG adapter?
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Will Persee and Astra sensors have fill OpenNI2 support (i.e. we can use the sensor wherever we can get OpenNI2 to run)?