Hello -
I am using a Lumenera Lm-075 USB camera to try to take long (~100s of ms) exposure pictures using Labview. I have the Lumenera instrument drivers for Labview and can take pictures, but cannot control the exposure time (as described below). I have included a picture of the block diagram where the exposure time is set as well as the front panel.
1. If
I change the exposure time using the Settings front panel it does not
have any effect on the exposure reported by the GetProp.vi (this is
recorded in the "exposure time used display" on the front panel. The
exposure time reported is always the exposure time ~ video frame rate
(e.g. if the frame rate is 60 fps then the exposure time reported is
1/60 = .016s).
2. I added a SetProp.vi for the exposure time to try to set the
exposure time separately. In this case, the reported exposure time
changes according to the input (e.g. if I input .1 the reported exposure
is .096 - a close approximation at least). However, when testing today
it seems that this exposure time is not what is actually used, but that
the camera is simply using the video frame rate exposure time no matter
what. I tested this by using the LuCam capture program snapshot tool
at 20ms (the 60fps exposure time), 100 ms, 200 ms, etc. These pictures
all look quite different, while the ones taken with the program all look
identical (brightness, level of detail, etc) to the picture taken at
20ms with the LuCam Capture program.
Do you have any suggestions? All I am seeking to do is replicate
the ability to change the exposure time of the Snapshot, as is done in
the LuCam Capture program.
Thanks,
Hannah
