Extended exposure times about librealsense HOT 8 CLOSED

What camera are you trying to target?

from librealsense.

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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#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.

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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.

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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.

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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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