Set Camera Resolution

[Carlos Antunes]

Hello!

First of all, thank you for all the people that contribute to the development of OpenPnP.

I'm running the latest snapshot of OpenPnP on Linux (Debian) and have an ELP camera capable of doing up to 1920x1080. My preferred resolution is 1280x1024 because it is the most "square". Using OpenCV directly or guvcview, I'm able to go thru all possible resolutions without any problem. However, on OpenPnP, and regardless of the setting, I always get 640x480. Any ideas on how I might force a different resolution?

Thanks!

Carlos

[Jason von Nieda]

Hi Carlos,

Have you tried setting the Preferred Width and Preferred Height settings? These control the resolution that OpenCV is commanded to use.

Also, when you say it always gets 640x480, where are seeing or measuring that?

Jason

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[Carlos Antunes]

Hi, Jason!

I'm setting my preferred width and height in the form you posted. With or without restart, the resolution shown on "Show Image Info?" is always 640x480. I get to this menu by right-clicking on the window where the camera image is shown.

Thanks!

Carlos

[Jason von Nieda]

Hi Carlos, can you show me the opencv code that works for you? Maybe I am doing something wrong in openpnp.

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[Carlos A]

Jason,

This is what I'm doing, in Python. Nothing out of the ordinary.

cap = cv2.VideoCapture()

cap.open(0)

cap.set(cv2.cv.CV_CAP_PROP_FRAME_WIDTH, 1280)

cap.set(cv2.cv.CV_CAP_PROP_FRAME_HEIGHT, 1024)

while(True):

    ret, img = cap.read()

    # etc...

Carlos

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[Jason von Nieda]

Carlos,

That's odd. That's how OpenPnP does it too: https://github.com/openpnp/openpnp/blob/develop/src/main/java/org/openpnp/machine/reference/camera/OpenCvCamera.java#L129

What version of OpenCV do you have installed for your Python bindings? The only things that come to mind are either a difference in version, or possibly the version of OpenCV I distribute may not include the same capture drivers that your local one does, so maybe the one you are hitting from Python gets a capture driver that support properties and the one I have in OpenPnP doesn't. Unfortunately I am not quite sure how to determine what the difference would be. 

Jason

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[Carlos A]

Jason,

I'm running opencv 2.4.9.1 (Debian jessie). I notice that initCamera() is being called from three different locations. Maybe it's being called when the preferred width/height haven't been set yet? I'm afraid I'm too clueless about Java to be of help... Maybe check and log the return values of  fg.fet(Highgui.CV_CAP_PROP_FRAME_WIDTH/HEIGHT) somewhere?

Carlos

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[Jason von Nieda]

Hi Carlos,

The feature does work, at least on Mac. I tested a bit earlier today and was able to set my camera to arbitrary resolutions with no problem. 

I've created an issue for this and have included instructions to test. It would be helpful if anyone else running Linux could run the test described in the issue and report their results.

https://github.com/openpnp/openpnp/issues/395

Thanks,

Jason

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[Jason von Nieda]

Carlos,

I've pushed a test version based on comments in the issue. Can you try it out? This version sets the camera resolution before and after opening and it also prints the resulting values to the log. Turn on DEBUG logging to see the output.

http://openpnp.org/test-downloads/

Jason