Quote:
Originally Posted by billbo911
Because of this thread, and because I had some time to kill, I pulled out my RPi 2 and tried a few tests to see what I could figure out for the LifeCam HD-3000 and adjusting exposure.
The first step was to see if would list out a setting for exposure. Sure enough it does. You can set it to manual or Aperture Priority mode (auto).
When in manual mode, you need to set the exposure value with exposure_absolute. The range of values it reports as acceptable are: min=5, max=20000.
In testing I found that it still had what amounted to a binary response to inputs while in manual. Any value above 5 resulted in over exposure. 5 resulted in under exposure. It didn't matter if I used anything from 6 to 20000, it was over exposed. 5 resulted in under exposure.
So now the next test is, can we set it to an exposure_absolute=5 and have a bright enough light shine on the target to get acceptable tracking of the target? (Enter the 3 X 3w LED ring). 
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It's interesting the newer camera at least announces the range as higher. The older Microsoft camera, still with the OmniVision sensor, did not even manage that at the V4L stack layer. Still basically the same issue. Will try to grab one of my mothballed older Microsoft cameras and the dig up the contact information for the V4L project maintainer. I can also put mine on a Raspberry Pi 2 which I assume Bilbo has Raspbian on: or did you go the Arch route?