Comments (8)
What camera are you trying to target?
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The R200.
On 26 Jan 2016 6:09 pm, "Dimitri Diakopoulos" [email protected]
wrote:
What camera are you trying to target?
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Reply to this email directly or view it on GitHub
#13 (comment)
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from librealsense.
Thanks for the quick reply! Unfortunately it is a hardware limitation that the R200 does not enable single-shot or long exposure functionality (Actually it is theoretically possible to implement in firmware, but that's a different story...).
For F200 and SR300, there is a camera hardware control called Motion vs. Range tradeoff which will dramatically increase range (long exposure) at the expense of FPS.
While it might not be possible to enable your use-case now, it would be nice to know what application you need long exposure for so we can document and add to various future requirements lists.
from librealsense.
I'll chime in here, too: I'm currently setting up an environment similar to HuddleLamp (Website, Paper, Video) with the F200, and the distance from camera to surface is ~ 80 cm. For this setup to work reliably, I've had to slightly increase the Motion/Range tradeoff.
from librealsense.
Thank you for the quick response! This is helpful to know. I should mention it is the colour camera that I was trying to get a longer exposure on.
My use case isn't very conventional so I can understand it isn't a highly desired feature. I just wanted to see how far I could use the sensor to take pictures as it is a pretty small device and would be convenient. I was planning to attempt HDR images.
from librealsense.
If motion isn't a concern, you should be able to take multiple video frames with a "full" exposure (33.33ms at 30fps) and add/average them together. This is essentially the same as taking a double exposure (adding gets you the added benefit that 2 frames would give you a 9 bit image, and 4 frames would give you a 10 bit image).
The only downside are possible motion artifacts in fast moving images. But it should work for a static scene.
from librealsense.
I appreciate the suggestion. That was actually what I was doing before. I find that the resultant image is more underexposed than I would expect for good HDR.
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Thanks for the discussion! Duly noted about the need for HDR support.
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