camera auto-exposure

[Al Yard]

Hi,

I'm trying to turn off the camera auto-exposure.  If I use a utility like v4l2ucp, it will turn off auto-exposure and my camera will work well.  But of course next time I turn on my computer, these settings will be lost.  

So instead I'm trying to set CAP_PROP_AUTO_EXPOSURE in camera properties.  Each time I try a value and press Apply, the image changes somewhat, but the auto-exposure is still turned on.

1.  What value should I set the CAP_PROP_AUTO_EXPOSURE property to turn off auto-exposure?

2.  What do the "Set Before Open" and "Set After Open" switches refer to?

Thanks,

Al

[Jason von Nieda]

Hi Al, if recommend switching over to OpenPnpCaptureCamera instead of OoenCvCamera if you can. It is far more stable and better supported. 

Jason

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[Al Yard]

Jason,

O/K, will do!   I've been away for a bit and have fallen behind.  So now I'm trying to catch up to the latest and greatest!

Al

On Friday, 16 August 2019 17:30:08 UTC-7, Jason von Nieda wrote:

Hi Al, if recommend switching over to OpenPnpCaptureCamera instead of OoenCvCamera if you can. It is far more stable and better supported. 

Jason

On Fri, Aug 16, 2019 at 7:22 PM Al Yard <ay...@e9.ca> wrote:

Hi,

I'm trying to turn off the camera auto-exposure.  If I use a utility like v4l2ucp, it will turn off auto-exposure and my camera will work well.  But of course next time I turn on my computer, these settings will be lost.  

So instead I'm trying to set CAP_PROP_AUTO_EXPOSURE in camera properties.  Each time I try a value and press Apply, the image changes somewhat, but the auto-exposure is still turned on.

1.  What value should I set the CAP_PROP_AUTO_EXPOSURE property to turn off auto-exposure?

2.  What do the "Set Before Open" and "Set After Open" switches refer to?

Thanks,

Al

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[Jim Freeman]

Hi, Al (and Jason.) Is there a procedure to switch over  to OpenPnpCaptureCamera? I edited my Machine.xml file (which had been ported to OpenPnP2). After replacing the "OpenCVCamera with OpenPnpCaptureCamera, the program crashes with attribute "device-index" not in class. Is there an example of how to set this part of the Machine.xml file?

Best,

Jim

 

[Jason von Nieda]

Hi Jim,

Easiest thing to do is just delete the camera from inside OpenPnP (under Machine Setup) and then add a new one, also inside OpenPnP, with OpenPnpCaptureCamera.

Jason

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[Jim Freeman]

The OpenPnpCaptureCamera is working great. Thanks, Jason!  I really like the slidebar adjustments. I was always crashing the OpenCVCamera when I sent a out-of-range number. I was able to get the camera adjusted better in 5 minutes that a couple of hours yesterday afternoon.

Best,

Jim

[Jason von Nieda]

That's great to hear Jim! Good work!

Jason

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